Version bump

fix latest version value

.travis.yml

@@ -3,7 +3,7 @@ language: android
 android:
   components:
     - tools
-    - build-tools-24.0.3
+    - build-tools-25.0.0
     - android-25
     - extra-android-m2repository
   licenses:

README.md

@@ -4,8 +4,8 @@
 
 A small, yet full-featured framework that allows building View-based Android applications. Conductor provides a light-weight wrapper around standard Android Views that does just about everything you'd want:
 
-              |  Conductor
-------|------------------------------
+|           |  Conductor  |
+|-----------|-------------|
 :tada: | Easy integration
 :point_up: | Single Activity apps without using Fragments
 :recycle: | Simple but powerful lifecycle management
@@ -20,26 +20,26 @@ Conductor is architecture-agnostic and does not try to force any design decision
 ## Installation
 
 ```gradle
-compile 'com.bluelinelabs:conductor:2.1.0'
+compile 'com.bluelinelabs:conductor:2.1.3'
 
 // If you want the components that go along with
 // Android's support libraries (currently just a PagerAdapter):
-compile 'com.bluelinelabs:conductor-support:2.1.0'
+compile 'com.bluelinelabs:conductor-support:2.1.3'
 
 // If you want RxJava lifecycle support:
-compile 'com.bluelinelabs:conductor-rxlifecycle:2.1.0'
+compile 'com.bluelinelabs:conductor-rxlifecycle:2.1.3'
 
 // If you want RxJava2 lifecycle support:
-compile 'com.bluelinelabs:conductor-rxlifecycle2:2.1.0'
+compile 'com.bluelinelabs:conductor-rxlifecycle2:2.1.3'
 ```
 
 SNAPSHOT:
 
 ```gradle
-compile 'com.bluelinelabs:conductor:2.1.1-SNAPSHOT'
-compile 'com.bluelinelabs:conductor-support:2.1.1-SNAPSHOT'
-compile 'com.bluelinelabs:conductor-rxlifecycle:2.1.1-SNAPSHOT'
-compile 'com.bluelinelabs:conductor-rxlifecycle2:2.1.1-SNAPSHOT'
+compile 'com.bluelinelabs:conductor:2.1.4-SNAPSHOT'
+compile 'com.bluelinelabs:conductor-support:2.1.4-SNAPSHOT'
+compile 'com.bluelinelabs:conductor-rxlifecycle:2.1.4-SNAPSHOT'
+compile 'com.bluelinelabs:conductor-rxlifecycle2:2.1.4-SNAPSHOT'
 ```
 
 You also have to add the url to the snapshot repository:
@@ -55,7 +55,7 @@ allprojects {
 
 ## Components to Know
 
-              |  Conductor Components
+|             |  Conductor Components |
 ------|------------------------------
 __Controller__ | The Controller is the View wrapper that will give you all of your lifecycle management features. Think of it as a lighter-weight and more predictable Fragment alternative with an easier to manage lifecycle.
 __Router__ | A Router implements navigation and backstack handling for Controllers. Router objects are attached to Activity/containing ViewGroup pairs. Routers do not directly render or push Views to the container ViewGroup, but instead defer this responsibility to the ControllerChangeHandler specified in a given transaction.
@@ -118,7 +118,7 @@ public class HomeController extends Controller {
 
 The lifecycle of a Controller is significantly simpler to understand than that of a Fragment. A lifecycle diagram is shown below:
 
-![Controller Lifecycle](docs/Controller Lifecycle.jpg)
+![Controller Lifecycle](docs/Controller%20Lifecycle.jpg)
 
 ## Advanced Topics
 

build.gradle

@@ -3,7 +3,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:2.3.0'
     }
 }
 

conductor-support/build.gradle

@@ -1,7 +1,14 @@
-apply from: rootProject.file('dependencies.gradle')
-apply from: rootProject.file('gradle-mvn-push.gradle')
+buildscript {
+    repositories {
+        jcenter()
+    }
+    dependencies {
+        classpath 'de.mobilej.unmock:UnMockPlugin:0.3.6'
+    }
+}
 
 apply plugin: 'com.android.library'
+apply plugin: 'de.mobilej.unmock'
 
 android {
     compileSdkVersion rootProject.ext.compileSdkVersion
@@ -21,9 +28,22 @@ android {
 }
 
 dependencies {
+    testCompile rootProject.ext.junit
+    testCompile rootProject.ext.roboelectric
+
     compile rootProject.ext.supportAppCompat
     compile project(':conductor')
 }
 
+unMock {
+    downloadFrom 'https://oss.sonatype.org/content/groups/public/org/robolectric/android-all/4.3_r2-robolectric-0/android-all-4.3_r2-robolectric-0.jar'
+
+    keep "android.os.Bundle"
+    keep "android.os.BaseBundle"
+}
+
 ext.artifactId = 'conductor-support'
 
+apply from: rootProject.file('dependencies.gradle')
+apply from: rootProject.file('gradle-mvn-push.gradle')
+

conductor-support/src/main/java/com/bluelinelabs/conductor/support/ControllerPagerAdapter.java

@@ -2,6 +2,7 @@ package com.bluelinelabs.conductor.support;
 
 import android.os.Bundle;
 import android.os.Parcelable;
+import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v4.view.PagerAdapter;
 import android.util.SparseArray;
@@ -34,7 +35,7 @@ public abstract class ControllerPagerAdapter extends PagerAdapter {
     /**
      * Creates a new ControllerPagerAdapter using the passed host.
      */
-    public ControllerPagerAdapter(Controller host, boolean saveControllerState) {
+    public ControllerPagerAdapter(@NonNull Controller host, boolean saveControllerState) {
         this.host = host;
         savesState = saveControllerState;
     }
@@ -42,6 +43,7 @@ public abstract class ControllerPagerAdapter extends PagerAdapter {
     /**
      * Return the Controller associated with a specified position.
      */
+    @NonNull
     public abstract Controller getItem(int position);
 
     @Override

conductor-support/src/main/java/com/bluelinelabs/conductor/support/RouterPagerAdapter.java

@@ -2,6 +2,7 @@ package com.bluelinelabs.conductor.support;
 
 import android.os.Bundle;
 import android.os.Parcelable;
+import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v4.view.PagerAdapter;
 import android.util.SparseArray;
@@ -12,6 +13,7 @@ import com.bluelinelabs.conductor.Controller;
 import com.bluelinelabs.conductor.Router;
 import com.bluelinelabs.conductor.RouterTransaction;
 
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -20,15 +22,19 @@ import java.util.List;
 public abstract class RouterPagerAdapter extends PagerAdapter {
 
     private static final String KEY_SAVED_PAGES = "RouterPagerAdapter.savedStates";
+    private static final String KEY_MAX_PAGES_TO_STATE_SAVE = "RouterPagerAdapter.maxPagesToStateSave";
+    private static final String KEY_SAVE_PAGE_HISTORY = "RouterPagerAdapter.savedPageHistory";
 
     private final Controller host;
+    private int maxPagesToStateSave = Integer.MAX_VALUE;
     private SparseArray<Bundle> savedPages = new SparseArray<>();
     private SparseArray<Router> visibleRouters = new SparseArray<>();
+    private ArrayList<Integer> savedPageHistory = new ArrayList<>();
 
     /**
      * Creates a new RouterPagerAdapter using the passed host.
      */
-    public RouterPagerAdapter(Controller host) {
+    public RouterPagerAdapter(@NonNull Controller host) {
         this.host = host;
     }
 
@@ -38,7 +44,21 @@ public abstract class RouterPagerAdapter extends PagerAdapter {
      * @param router   The router used for the page
      * @param position The page position to be instantiated.
      */
-    public abstract void configureRouter(Router router, int position);
+    public abstract void configureRouter(@NonNull Router router, int position);
+
+    /**
+     * Sets the maximum number of pages that will have their states saved. When this number is exceeded,
+     * the page that was state saved least recently will have its state removed from the save data.
+     */
+    public void setMaxPagesToStateSave(int maxPagesToStateSave) {
+        if (maxPagesToStateSave < 0) {
+            throw new IllegalArgumentException("Only positive integers may be passed for maxPagesToStateSave.");
+        }
+
+        this.maxPagesToStateSave = maxPagesToStateSave;
+
+        ensurePagesSaved();
+    }
 
     @Override
     public Object instantiateItem(ViewGroup container, int position) {
@@ -50,6 +70,7 @@ public abstract class RouterPagerAdapter extends PagerAdapter {
 
             if (routerSavedState != null) {
                 router.restoreInstanceState(routerSavedState);
+                savedPages.remove(position);
             }
         }
 
@@ -68,6 +89,11 @@ public abstract class RouterPagerAdapter extends PagerAdapter {
         router.saveInstanceState(savedState);
         savedPages.put(position, savedState);
 
+        savedPageHistory.remove((Integer)position);
+        savedPageHistory.add(position);
+
+        ensurePagesSaved();
+
         host.removeChildRouter(router);
 
         visibleRouters.remove(position);
@@ -89,6 +115,8 @@ public abstract class RouterPagerAdapter extends PagerAdapter {
     public Parcelable saveState() {
         Bundle bundle = new Bundle();
         bundle.putSparseParcelableArray(KEY_SAVED_PAGES, savedPages);
+        bundle.putInt(KEY_MAX_PAGES_TO_STATE_SAVE, maxPagesToStateSave);
+        bundle.putIntegerArrayList(KEY_SAVE_PAGE_HISTORY, savedPageHistory);
         return bundle;
     }
 
@@ -97,6 +125,8 @@ public abstract class RouterPagerAdapter extends PagerAdapter {
         Bundle bundle = (Bundle)state;
         if (state != null) {
             savedPages = bundle.getSparseParcelableArray(KEY_SAVED_PAGES);
+            maxPagesToStateSave = bundle.getInt(KEY_MAX_PAGES_TO_STATE_SAVE);
+            savedPageHistory = bundle.getIntegerArrayList(KEY_SAVE_PAGE_HISTORY);
         }
     }
 
@@ -113,6 +143,17 @@ public abstract class RouterPagerAdapter extends PagerAdapter {
         return position;
     }
 
+    SparseArray<Bundle> getSavedPages() {
+        return savedPages;
+    }
+
+    private void ensurePagesSaved() {
+        while (savedPages.size() > maxPagesToStateSave) {
+            int positionToRemove = savedPageHistory.remove(0);
+            savedPages.remove(positionToRemove);
+        }
+    }
+
     private static String makeRouterName(int viewId, long id) {
         return viewId + ":" + id;
     }

conductor-support/src/test/java/com/bluelinelabs/conductor/support/StateSaveTests.java

@@ -0,0 +1,113 @@
+package com.bluelinelabs.conductor.support;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.util.SparseArray;
+import android.widget.FrameLayout;
+
+import com.bluelinelabs.conductor.Conductor;
+import com.bluelinelabs.conductor.Router;
+import com.bluelinelabs.conductor.RouterTransaction;
+import com.bluelinelabs.conductor.support.util.FakePager;
+import com.bluelinelabs.conductor.support.util.TestController;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.Robolectric;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.annotation.Config;
+import org.robolectric.util.ActivityController;
+
+import static org.junit.Assert.assertEquals;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(manifest = Config.NONE)
+public class StateSaveTests {
+
+    private FakePager pager;
+    private RouterPagerAdapter pagerAdapter;
+
+    public void createActivityController(Bundle savedInstanceState) {
+        ActivityController<Activity> activityController = Robolectric.buildActivity(Activity.class).create().start().resume();
+        Router router = Conductor.attachRouter(activityController.get(), new FrameLayout(activityController.get()), savedInstanceState);
+        TestController controller = new TestController();
+        router.setRoot(RouterTransaction.with(controller));
+
+        pager = new FakePager(new FrameLayout(activityController.get()));
+        pager.setOffscreenPageLimit(1);
+
+        pagerAdapter = new RouterPagerAdapter(controller) {
+            @Override
+            public void configureRouter(@NonNull Router router, int position) {
+                if (!router.hasRootController()) {
+                    router.setRoot(RouterTransaction.with(new TestController()));
+                }
+            }
+
+            @Override
+            public int getCount() {
+                return 20;
+            }
+        };
+
+        pager.setAdapter(pagerAdapter);
+    }
+
+    @Before
+    public void setup() {
+        createActivityController(null);
+    }
+
+    @Test
+    public void testNoMaxSaves() {
+        // Load all pages
+        for (int i = 0; i < pagerAdapter.getCount(); i++) {
+            pager.pageTo(i);
+        }
+
+        pager.pageTo(pagerAdapter.getCount() / 2);
+
+        // Ensure all non-visible pages are saved
+        assertEquals(pagerAdapter.getCount() - 1 - pager.getOffscreenPageLimit() * 2, pagerAdapter.getSavedPages().size());
+    }
+
+    @Test
+    public void testMaxSavedSet() {
+        final int maxPages = 3;
+        pagerAdapter.setMaxPagesToStateSave(maxPages);
+
+        // Load all pages
+        for (int i = 0; i < pagerAdapter.getCount(); i++) {
+            pager.pageTo(i);
+        }
+
+        final int firstSelectedItem = pagerAdapter.getCount() / 2;
+        pager.pageTo(firstSelectedItem);
+
+        SparseArray<Bundle> savedPages = pagerAdapter.getSavedPages();
+
+        // Ensure correct number of pages are saved
+        assertEquals(maxPages, savedPages.size());
+
+        // Ensure correct pages are saved
+        assertEquals(pagerAdapter.getCount() - 3, savedPages.keyAt(0));
+        assertEquals(pagerAdapter.getCount() - 2, savedPages.keyAt(1));
+        assertEquals(pagerAdapter.getCount() - 1, savedPages.keyAt(2));
+
+        final int secondSelectedItem = 1;
+        pager.pageTo(secondSelectedItem);
+
+        savedPages = pagerAdapter.getSavedPages();
+
+        // Ensure correct number of pages are saved
+        assertEquals(maxPages, savedPages.size());
+
+        // Ensure correct pages are saved
+        assertEquals(firstSelectedItem - 1, savedPages.keyAt(0));
+        assertEquals(firstSelectedItem, savedPages.keyAt(1));
+        assertEquals(firstSelectedItem + 1, savedPages.keyAt(2));
+    }
+
+}

conductor-support/src/test/java/com/bluelinelabs/conductor/support/util/FakePager.java

@@ -0,0 +1,61 @@
+package com.bluelinelabs.conductor.support.util;
+
+import android.util.SparseArray;
+import android.view.ViewGroup;
+
+import com.bluelinelabs.conductor.support.RouterPagerAdapter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class FakePager {
+
+    private ViewGroup container;
+    private int offscreenPageLimit;
+    private final SparseArray<Object> pages = new SparseArray<>();
+
+    private RouterPagerAdapter adapter;
+
+    public FakePager(ViewGroup container) {
+        this.container = container;
+    }
+
+    public void setAdapter(RouterPagerAdapter adapter) {
+        this.adapter = adapter;
+    }
+
+    public void pageTo(int page) {
+        int firstPage = Math.max(0, page - offscreenPageLimit);
+        int lastPage = Math.min(adapter.getCount() - 1, page + offscreenPageLimit);
+
+        List<Integer> pagesI = new ArrayList<>();
+        for (int i = 0; i < pages.size(); i++) {
+            pagesI.add(pages.keyAt(i));
+        }
+
+        for (int i = pages.size() - 1; i >= 0; i--) {
+            int key = pages.keyAt(i);
+
+            if (key < firstPage || key > lastPage) {
+                adapter.destroyItem(container, key, pages.get(key));
+                pages.remove(key);
+            }
+        }
+
+        for (int key = firstPage; key <= lastPage; key++) {
+            if (pages.get(key) == null) {
+                pages.put(key, adapter.instantiateItem(container, key));
+            }
+        }
+
+        adapter.setPrimaryItem(container, page, pages.get(page));
+    }
+
+    public int getOffscreenPageLimit() {
+        return offscreenPageLimit;
+    }
+
+    public void setOffscreenPageLimit(int offscreenPageLimit) {
+        this.offscreenPageLimit = offscreenPageLimit;
+    }
+}

conductor-support/src/test/java/com/bluelinelabs/conductor/support/util/TestController.java

@@ -0,0 +1,18 @@
+package com.bluelinelabs.conductor.support.util;
+
+import android.support.annotation.NonNull;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.FrameLayout;
+
+import com.bluelinelabs.conductor.Controller;
+
+public class TestController extends Controller {
+
+    @NonNull @Override
+    protected View onCreateView(@NonNull LayoutInflater inflater, @NonNull ViewGroup container) {
+        return new FrameLayout(inflater.getContext());
+    }
+
+}

conductor/src/main/java/com/bluelinelabs/conductor/ActivityHostedRouter.java

@@ -2,6 +2,8 @@ package com.bluelinelabs.conductor;
 
 import android.app.Activity;
 import android.content.Intent;
+import android.content.IntentSender;
+import android.content.IntentSender.SendIntentException;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
@@ -85,6 +87,12 @@ public class ActivityHostedRouter extends Router {
         lifecycleHandler.startActivityForResult(instanceId, intent, requestCode, options);
     }
 
+    @Override
+    void startIntentSenderForResult(@NonNull String instanceId, @NonNull IntentSender intent, int requestCode, @Nullable Intent fillInIntent,
+                                    int flagsMask, int flagsValues, int extraFlags, @Nullable Bundle options) throws SendIntentException {
+        lifecycleHandler.startIntentSenderForResult(instanceId, intent, requestCode, fillInIntent, flagsMask, flagsValues, extraFlags, options);
+    }
+
     @Override
     void registerForActivityResult(@NonNull String instanceId, int requestCode) {
         lifecycleHandler.registerForActivityResult(instanceId, requestCode);

conductor/src/main/java/com/bluelinelabs/conductor/Backstack.java

@@ -18,16 +18,16 @@ class Backstack implements Iterable<RouterTransaction> {
     private final Deque<RouterTransaction> backstack = new ArrayDeque<>();
 
     @SuppressWarnings("BooleanMethodIsAlwaysInverted")
-    public boolean isEmpty() {
+    boolean isEmpty() {
         return backstack.isEmpty();
     }
 
-    public int size() {
+    int size() {
         return backstack.size();
     }
 
     @Nullable
-    public RouterTransaction root() {
+    RouterTransaction root() {
         return backstack.size() > 0 ? backstack.getLast() : null;
     }
 
@@ -37,12 +37,12 @@ class Backstack implements Iterable<RouterTransaction> {
     }
 
     @NonNull
-    public Iterator<RouterTransaction> reverseIterator() {
+    Iterator<RouterTransaction> reverseIterator() {
         return backstack.descendingIterator();
     }
 
     @NonNull
-    public List<RouterTransaction> popTo(@NonNull RouterTransaction transaction) {
+    List<RouterTransaction> popTo(@NonNull RouterTransaction transaction) {
         List<RouterTransaction> popped = new ArrayList<>();
         if (backstack.contains(transaction)) {
             while (backstack.peek() != transaction) {
@@ -56,27 +56,27 @@ class Backstack implements Iterable<RouterTransaction> {
     }
 
     @NonNull
-    public RouterTransaction pop() {
+    RouterTransaction pop() {
         RouterTransaction popped = backstack.pop();
         popped.controller.destroy();
         return popped;
     }
 
     @Nullable
-    public RouterTransaction peek() {
+    RouterTransaction peek() {
         return backstack.peek();
     }
 
-    public void remove(@NonNull RouterTransaction transaction) {
+    void remove(@NonNull RouterTransaction transaction) {
         backstack.removeFirstOccurrence(transaction);
     }
 
-    public void push(@NonNull RouterTransaction transaction) {
+    void push(@NonNull RouterTransaction transaction) {
         backstack.push(transaction);
     }
 
     @NonNull
-    public List<RouterTransaction> popAll() {
+    List<RouterTransaction> popAll() {
         List<RouterTransaction> list = new ArrayList<>();
         while (!isEmpty()) {
             list.add(pop());
@@ -84,7 +84,7 @@ class Backstack implements Iterable<RouterTransaction> {
         return list;
     }
 
-    public void setBackstack(@NonNull List<RouterTransaction> backstack) {
+    void setBackstack(@NonNull List<RouterTransaction> backstack) {
         for (RouterTransaction existingTransaction : this.backstack) {
             boolean contains = false;
             for (RouterTransaction newTransaction : backstack) {
@@ -105,7 +105,11 @@ class Backstack implements Iterable<RouterTransaction> {
         }
     }
 
-    public void saveInstanceState(@NonNull Bundle outState) {
+    boolean contains(@NonNull RouterTransaction transaction) {
+        return backstack.contains(transaction);
+    }
+
+    void saveInstanceState(@NonNull Bundle outState) {
         ArrayList<Bundle> entryBundles = new ArrayList<>(backstack.size());
         for (RouterTransaction entry : backstack) {
             entryBundles.add(entry.saveInstanceState());
@@ -114,7 +118,7 @@ class Backstack implements Iterable<RouterTransaction> {
         outState.putParcelableArrayList(KEY_ENTRIES, entryBundles);
     }
 
-    public void restoreInstanceState(@NonNull Bundle savedInstanceState) {
+    void restoreInstanceState(@NonNull Bundle savedInstanceState) {
         ArrayList<Bundle> entryBundles = savedInstanceState.getParcelableArrayList(KEY_ENTRIES);
         if (entryBundles != null) {
             Collections.reverse(entryBundles);

conductor/src/main/java/com/bluelinelabs/conductor/Conductor.java

@@ -8,14 +8,15 @@ import android.support.annotation.UiThread;
 import android.view.ViewGroup;
 
 import com.bluelinelabs.conductor.internal.LifecycleHandler;
+import com.bluelinelabs.conductor.internal.ThreadUtils;
 
 /**
  * Point of initial interaction with Conductor. Used to attach a {@link Router} to your Activity.
  */
 public final class Conductor {
-    
+
     private Conductor() {}
-    
+
     /**
      * Conductor will create a {@link Router} that has been initialized for your Activity and containing ViewGroup.
      * If an existing {@link Router} is already associated with this Activity/ViewGroup pair, either in memory
@@ -30,6 +31,8 @@ public final class Conductor {
      */
     @NonNull @UiThread
     public static Router attachRouter(@NonNull Activity activity, @NonNull ViewGroup container, @Nullable Bundle savedInstanceState) {
+        ThreadUtils.ensureMainThread();
+
         LifecycleHandler lifecycleHandler = LifecycleHandler.install(activity);
 
         Router router = lifecycleHandler.getRouter(container, savedInstanceState);

conductor/src/main/java/com/bluelinelabs/conductor/Controller.java

@@ -4,9 +4,11 @@ import android.annotation.TargetApi;
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
+import android.content.IntentSender;
 import android.content.res.Resources;
 import android.os.Build;
 import android.os.Bundle;
+import android.os.Handler;
 import android.os.Parcelable;
 import android.support.annotation.IdRes;
 import android.support.annotation.NonNull;
@@ -54,7 +56,7 @@ public abstract class Controller {
     private static final String KEY_OVERRIDDEN_PUSH_HANDLER = "Controller.overriddenPushHandler";
     private static final String KEY_OVERRIDDEN_POP_HANDLER = "Controller.overriddenPopHandler";
     private static final String KEY_VIEW_STATE_HIERARCHY = "Controller.viewState.hierarchy";
-    private static final String KEY_VIEW_STATE_BUNDLE = "Controller.viewState.bundle";
+    static final String KEY_VIEW_STATE_BUNDLE = "Controller.viewState.bundle";
     private static final String KEY_RETAIN_VIEW_MODE = "Controller.retainViewMode";
 
     private final Bundle args;
@@ -85,19 +87,26 @@ public abstract class Controller {
     private final List<LifecycleListener> lifecycleListeners = new ArrayList<>();
     private final ArrayList<String> requestedPermissions = new ArrayList<>();
     private final ArrayList<RouterRequiringFunc> onRouterSetListeners = new ArrayList<>();
+    private final Handler handler = new Handler();
     private WeakReference<View> destroyedView;
+    private boolean isPerformingExitTransition;
 
     @NonNull
     static Controller newInstance(@NonNull Bundle bundle) {
         final String className = bundle.getString(KEY_CLASS_NAME);
         //noinspection ConstantConditions
-        Constructor[] constructors = ClassUtils.classForName(className, false).getConstructors();
+        Class cls = ClassUtils.classForName(className, false);
+        Constructor[] constructors = cls.getConstructors();
         Constructor bundleConstructor = getBundleConstructor(constructors);
 
         Controller controller;
         try {
             if (bundleConstructor != null) {
-                controller = (Controller)bundleConstructor.newInstance(bundle.getBundle(KEY_ARGS));
+                Bundle args = bundle.getBundle(KEY_ARGS);
+                if (args != null) {
+                    args.setClassLoader(cls.getClassLoader());
+                }
+                controller = (Controller)bundleConstructor.newInstance(args);
             } else {
                 //noinspection ConstantConditions
                 controller = (Controller)getDefaultConstructor(constructors).newInstance();
@@ -123,7 +132,7 @@ public abstract class Controller {
      * @param args Any arguments that need to be retained.
      */
     protected Controller(@Nullable Bundle args) {
-        this.args = args != null ? args : new Bundle();
+        this.args = args != null ? args : new Bundle(getClass().getClassLoader());
         instanceId = UUID.randomUUID().toString();
         ensureRequiredConstructor();
     }
@@ -210,6 +219,10 @@ public abstract class Controller {
                 childRouter = new ControllerHostedRouter(container.getId(), tag);
                 childRouter.setHost(this, container);
                 childRouters.add(childRouter);
+
+                if (isPerformingExitTransition) {
+                    childRouter.setDetachFrozen(true);
+                }
             }
         } else if (!childRouter.hasHost()) {
             childRouter.setHost(this, container);
@@ -494,6 +507,14 @@ public abstract class Controller {
         });
     }
 
+    /**
+     * Calls startIntentSenderForResult(IntentSender, int, Intent, int, int, int, Bundle) from this Controller's host Activity.
+     */
+    public final void startIntentSenderForResult(@NonNull final IntentSender intent, final int requestCode, @Nullable final Intent fillInIntent, final int flagsMask,
+                                                 final int flagsValues, final int extraFlags, @Nullable final Bundle options) throws IntentSender.SendIntentException {
+        router.startIntentSenderForResult(instanceId, intent, requestCode, fillInIntent, flagsMask, flagsValues, extraFlags, options);
+    }
+
     /**
      * Registers this Controller to handle onActivityResult responses. Calling this method is NOT
      * necessary when calling {@link #startActivityForResult(Intent, int)}
@@ -584,7 +605,7 @@ public abstract class Controller {
      *
      * @param lifecycleListener The listener
      */
-    public void addLifecycleListener(@NonNull LifecycleListener lifecycleListener) {
+    public final void addLifecycleListener(@NonNull LifecycleListener lifecycleListener) {
         if (!lifecycleListeners.contains(lifecycleListener)) {
             lifecycleListeners.add(lifecycleListener);
         }
@@ -595,7 +616,7 @@ public abstract class Controller {
      *
      * @param lifecycleListener The listener to be removed
      */
-    public void removeLifecycleListener(@NonNull LifecycleListener lifecycleListener) {
+    public final void removeLifecycleListener(@NonNull LifecycleListener lifecycleListener) {
         lifecycleListeners.remove(lifecycleListener);
     }
 
@@ -798,7 +819,7 @@ public abstract class Controller {
         }
     }
 
-    private void attach(@NonNull View view) {
+    private void attach(@NonNull final View view) {
         attachedToUnownedParent = router == null || view.getParent() != router.container;
         if (attachedToUnownedParent) {
             return;
@@ -814,16 +835,23 @@ public abstract class Controller {
         attached = true;
         needsAttach = false;
 
-        onAttach(view);
+        // This must be posted in a handler to ensure the system can finish attaching views if needed. Otherwise
+        // we can get NPEs when developers decide to immediately pop this controller from onAttach.
+        handler.post(new Runnable() {
+            @Override
+            public void run() {
+                onAttach(view);
 
-        if (hasOptionsMenu && !optionsMenuHidden) {
-            router.invalidateOptionsMenu();
-        }
+                if (hasOptionsMenu && !optionsMenuHidden) {
+                    router.invalidateOptionsMenu();
+                }
 
-        listeners = new ArrayList<>(lifecycleListeners);
-        for (LifecycleListener lifecycleListener : listeners) {
-            lifecycleListener.postAttach(this, view);
-        }
+                List<LifecycleListener> listeners = new ArrayList<>(lifecycleListeners);
+                for (LifecycleListener lifecycleListener : listeners) {
+                    lifecycleListener.postAttach(Controller.this, view);
+                }
+            }
+        });
     }
 
     void detach(@NonNull View view, boolean forceViewRefRemoval, boolean blockViewRefRemoval) {
@@ -1017,7 +1045,7 @@ public abstract class Controller {
         view.saveHierarchyState(hierarchyState);
         viewState.putSparseParcelableArray(KEY_VIEW_STATE_HIERARCHY, hierarchyState);
 
-        Bundle stateBundle = new Bundle();
+        Bundle stateBundle = new Bundle(getClass().getClassLoader());
         onSaveViewState(view, stateBundle);
         viewState.putBundle(KEY_VIEW_STATE_BUNDLE, stateBundle);
 
@@ -1030,7 +1058,9 @@ public abstract class Controller {
     private void restoreViewState(@NonNull View view) {
         if (viewState != null) {
             view.restoreHierarchyState(viewState.getSparseParcelableArray(KEY_VIEW_STATE_HIERARCHY));
-            onRestoreViewState(view, viewState.getBundle(KEY_VIEW_STATE_BUNDLE));
+            Bundle savedViewState = viewState.getBundle(KEY_VIEW_STATE_BUNDLE);
+            savedViewState.setClassLoader(getClass().getClassLoader());
+            onRestoreViewState(view, savedViewState);
 
             restoreChildControllerHosts();
 
@@ -1071,7 +1101,7 @@ public abstract class Controller {
         }
         outState.putParcelableArrayList(KEY_CHILD_ROUTERS, childBundles);
 
-        Bundle savedState = new Bundle();
+        Bundle savedState = new Bundle(getClass().getClassLoader());
         onSaveInstanceState(savedState);
 
         List<LifecycleListener> listeners = new ArrayList<>(lifecycleListeners);
@@ -1106,6 +1136,9 @@ public abstract class Controller {
         }
 
         this.savedInstanceState = savedInstanceState.getBundle(KEY_SAVED_STATE);
+        if (this.savedInstanceState != null) {
+            this.savedInstanceState.setClassLoader(getClass().getClassLoader());
+        }
         performOnRestoreInstanceState();
     }
 
@@ -1124,6 +1157,7 @@ public abstract class Controller {
 
     final void changeStarted(@NonNull ControllerChangeHandler changeHandler, @NonNull ControllerChangeType changeType) {
         if (!changeType.isEnter) {
+            isPerformingExitTransition = true;
             for (ControllerHostedRouter router : childRouters) {
                 router.setDetachFrozen(true);
             }
@@ -1139,6 +1173,7 @@ public abstract class Controller {
 
     final void changeEnded(@NonNull ControllerChangeHandler changeHandler, @NonNull ControllerChangeType changeType) {
         if (!changeType.isEnter) {
+            isPerformingExitTransition = false;
             for (ControllerHostedRouter router : childRouters) {
                 router.setDetachFrozen(false);
             }

conductor/src/main/java/com/bluelinelabs/conductor/ControllerHostedRouter.java

@@ -2,6 +2,8 @@ package com.bluelinelabs.conductor;
 
 import android.app.Activity;
 import android.content.Intent;
+import android.content.IntentSender;
+import android.content.IntentSender.SendIntentException;
 import android.os.Bundle;
 import android.support.annotation.IdRes;
 import android.support.annotation.NonNull;
@@ -23,6 +25,7 @@ class ControllerHostedRouter extends Router {
 
     @IdRes private int hostId;
     private String tag;
+    private boolean isDetachFrozen;
 
     ControllerHostedRouter() { }
 
@@ -67,6 +70,7 @@ class ControllerHostedRouter extends Router {
     }
 
     final void setDetachFrozen(boolean frozen) {
+        isDetachFrozen = frozen;
         for (RouterTransaction transaction : backstack) {
             transaction.controller.setDetachFrozen(frozen);
         }
@@ -78,6 +82,24 @@ class ControllerHostedRouter extends Router {
         super.destroy(popViews);
     }
 
+    @Override
+    protected void pushToBackstack(@NonNull RouterTransaction entry) {
+        if (isDetachFrozen) {
+            entry.controller.setDetachFrozen(true);
+        }
+        super.pushToBackstack(entry);
+    }
+
+    @Override
+    public void setBackstack(@NonNull List<RouterTransaction> newBackstack, @Nullable ControllerChangeHandler changeHandler) {
+        if (isDetachFrozen) {
+            for (RouterTransaction transaction : newBackstack) {
+                transaction.controller.setDetachFrozen(true);
+            }
+        }
+        super.setBackstack(newBackstack, changeHandler);
+    }
+
     @Override @Nullable
     public Activity getActivity() {
         return hostController != null ? hostController.getActivity() : null;
@@ -125,6 +147,13 @@ class ControllerHostedRouter extends Router {
         }
     }
 
+    @Override
+    void startIntentSenderForResult(@NonNull String instanceId, @NonNull IntentSender intent, int requestCode, @Nullable Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags, @Nullable Bundle options) throws SendIntentException {
+        if (hostController != null && hostController.getRouter() != null) {
+            hostController.getRouter().startIntentSenderForResult(instanceId, intent, requestCode, fillInIntent, flagsMask, flagsValues, extraFlags, options);
+        }
+    }
+
     @Override
     void registerForActivityResult(@NonNull String instanceId, int requestCode) {
         if (hostController != null && hostController.getRouter() != null) {

conductor/src/main/java/com/bluelinelabs/conductor/RestoreViewOnCreateController.java

@@ -32,7 +32,7 @@ abstract public class RestoreViewOnCreateController extends Controller {
 
     @Override @NonNull
     protected final View onCreateView(@NonNull LayoutInflater inflater, @NonNull ViewGroup container) {
-        return onCreateView(inflater, container, viewState);
+        return onCreateView(inflater, container, viewState == null ? null : viewState.getBundle(KEY_VIEW_STATE_BUNDLE));
     }
 
     /**

conductor/src/main/java/com/bluelinelabs/conductor/Router.java

@@ -2,6 +2,7 @@ package com.bluelinelabs.conductor;
 
 import android.app.Activity;
 import android.content.Intent;
+import android.content.IntentSender;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
@@ -16,6 +17,7 @@ import com.bluelinelabs.conductor.Controller.LifecycleListener;
 import com.bluelinelabs.conductor.ControllerChangeHandler.ControllerChangeListener;
 import com.bluelinelabs.conductor.changehandler.SimpleSwapChangeHandler;
 import com.bluelinelabs.conductor.internal.NoOpControllerChangeHandler;
+import com.bluelinelabs.conductor.internal.ThreadUtils;
 import com.bluelinelabs.conductor.internal.TransactionIndexer;
 
 import java.util.ArrayList;
@@ -82,6 +84,8 @@ public abstract class Router {
      */
     @UiThread
     public boolean handleBack() {
+        ThreadUtils.ensureMainThread();
+
         if (!backstack.isEmpty()) {
             //noinspection ConstantConditions
             if (backstack.peek().controller.handleBack()) {
@@ -99,8 +103,11 @@ public abstract class Router {
      *
      * @return Whether or not this Router still has controllers remaining on it after popping.
      */
+    @SuppressWarnings("WeakerAccess")
     @UiThread
     public boolean popCurrentController() {
+        ThreadUtils.ensureMainThread();
+
         RouterTransaction transaction = backstack.peek();
         if (transaction == null) {
             throw new IllegalStateException("Trying to pop the current controller when there are none on the backstack.");
@@ -116,26 +123,39 @@ public abstract class Router {
      */
     @UiThread
     public boolean popController(@NonNull Controller controller) {
-        RouterTransaction topController = backstack.peek();
-        boolean poppingTopController = topController != null && topController.controller == controller;
+        ThreadUtils.ensureMainThread();
+
+        RouterTransaction topTransaction = backstack.peek();
+        boolean poppingTopController = topTransaction != null && topTransaction.controller == controller;
 
         if (poppingTopController) {
             trackDestroyingController(backstack.pop());
+            performControllerChange(backstack.peek(), topTransaction, false);
         } else {
+            RouterTransaction removedTransaction = null;
+            RouterTransaction nextTransaction = null;
             for (RouterTransaction transaction : backstack) {
                 if (transaction.controller == controller) {
+                    if (controller.isAttached()) {
+                        trackDestroyingController(transaction);
+                    }
                     backstack.remove(transaction);
+                    removedTransaction = transaction;
+                } else if (removedTransaction != null) {
+                    if (!transaction.controller.isAttached()) {
+                        nextTransaction = transaction;
+                    }
                     break;
                 }
             }
-        }
 
-        if (poppingTopController) {
-            performControllerChange(backstack.peek(), topController, false);
+            if (removedTransaction != null) {
+                performControllerChange(nextTransaction, removedTransaction, false);
+            }
         }
 
         if (popsLastView) {
-            return topController != null;
+            return topTransaction != null;
         } else {
             return !backstack.isEmpty();
         }
@@ -149,6 +169,8 @@ public abstract class Router {
      */
     @UiThread
     public void pushController(@NonNull RouterTransaction transaction) {
+        ThreadUtils.ensureMainThread();
+
         RouterTransaction from = backstack.peek();
         pushToBackstack(transaction);
         performControllerChange(transaction, from, true);
@@ -160,8 +182,11 @@ public abstract class Router {
      * @param transaction The transaction detailing what should be pushed, including the {@link Controller},
      *                    and its push and pop {@link ControllerChangeHandler}, and its tag.
      */
+    @SuppressWarnings("WeakerAccess")
     @UiThread
     public void replaceTopController(@NonNull RouterTransaction transaction) {
+        ThreadUtils.ensureMainThread();
+
         RouterTransaction topTransaction = backstack.peek();
         if (!backstack.isEmpty()) {
             trackDestroyingController(backstack.pop());
@@ -169,6 +194,7 @@ public abstract class Router {
 
         final ControllerChangeHandler handler = transaction.pushChangeHandler();
         if (topTransaction != null) {
+            //noinspection ConstantConditions
             final boolean oldHandlerRemovedViews = topTransaction.pushChangeHandler() == null || topTransaction.pushChangeHandler().removesFromViewOnPush();
             final boolean newHandlerRemovesViews = handler == null || handler.removesFromViewOnPush();
             if (!oldHandlerRemovedViews && newHandlerRemovesViews) {
@@ -188,11 +214,24 @@ public abstract class Router {
 
     void destroy(boolean popViews) {
         popsLastView = true;
-        List<RouterTransaction> poppedControllers = backstack.popAll();
+        final List<RouterTransaction> poppedControllers = backstack.popAll();
         trackDestroyingControllers(poppedControllers);
 
         if (popViews && poppedControllers.size() > 0) {
-            performControllerChange(null, poppedControllers.get(0), false, poppedControllers.get(0).popChangeHandler());
+            RouterTransaction topTransaction = poppedControllers.get(0);
+            topTransaction.controller().addLifecycleListener(new LifecycleListener() {
+                @Override
+                public void onChangeEnd(@NonNull Controller controller, @NonNull ControllerChangeHandler changeHandler, @NonNull ControllerChangeType changeType) {
+                    if (changeType == ControllerChangeType.POP_EXIT) {
+                        for (int i = poppedControllers.size() - 1; i > 0; i--) {
+                            RouterTransaction transaction = poppedControllers.get(i);
+                            performControllerChange(null, transaction, true, new SimpleSwapChangeHandler());
+                        }
+                    }
+                }
+            });
+
+            performControllerChange(null, topTransaction, false, topTransaction.popChangeHandler());
         }
     }
 
@@ -218,6 +257,8 @@ public abstract class Router {
      */
     @UiThread
     public boolean popToRoot() {
+        ThreadUtils.ensureMainThread();
+
         return popToRoot(null);
     }
 
@@ -227,8 +268,11 @@ public abstract class Router {
      * @param changeHandler The {@link ControllerChangeHandler} to handle this transaction
      * @return Whether or not any {@link Controller}s were popped in order to get to the root transaction
      */
+    @SuppressWarnings("WeakerAccess")
     @UiThread
     public boolean popToRoot(@Nullable ControllerChangeHandler changeHandler) {
+        ThreadUtils.ensureMainThread();
+
         if (backstack.size() > 1) {
             //noinspection ConstantConditions
             popToTransaction(backstack.root(), changeHandler);
@@ -246,6 +290,8 @@ public abstract class Router {
      */
     @UiThread
     public boolean popToTag(@NonNull String tag) {
+        ThreadUtils.ensureMainThread();
+
         return popToTag(tag, null);
     }
 
@@ -256,8 +302,11 @@ public abstract class Router {
      * @param changeHandler The {@link ControllerChangeHandler} to handle this transaction
      * @return Whether or not the {@link Controller} with the passed tag is now at the top
      */
+    @SuppressWarnings("WeakerAccess")
     @UiThread
     public boolean popToTag(@NonNull String tag, @Nullable ControllerChangeHandler changeHandler) {
+        ThreadUtils.ensureMainThread();
+
         for (RouterTransaction transaction : backstack) {
             if (tag.equals(transaction.tag())) {
                 popToTransaction(transaction, changeHandler);
@@ -275,8 +324,9 @@ public abstract class Router {
      */
     @UiThread
     public void setRoot(@NonNull RouterTransaction transaction) {
-        List<RouterTransaction> transactions = new ArrayList<>();
-        transactions.add(transaction);
+        ThreadUtils.ensureMainThread();
+
+        List<RouterTransaction> transactions = Collections.singletonList(transaction);
         setBackstack(transactions, transaction.pushChangeHandler());
     }
 
@@ -316,6 +366,7 @@ public abstract class Router {
     /**
      * Returns the number of {@link Controller}s currently in the backstack
      */
+    @SuppressWarnings("WeakerAccess")
     public int getBackstackSize() {
         return backstack.size();
     }
@@ -340,10 +391,15 @@ public abstract class Router {
      * @param newBackstack  The new backstack
      * @param changeHandler An optional change handler to be used to handle the root view of transition
      */
+    @SuppressWarnings("WeakerAccess")
     @UiThread
     public void setBackstack(@NonNull List<RouterTransaction> newBackstack, @Nullable ControllerChangeHandler changeHandler) {
+        ThreadUtils.ensureMainThread();
+
         List<RouterTransaction> oldVisibleTransactions = getVisibleTransactions(backstack.iterator());
 
+        boolean newRootRequiresPush = !(newBackstack.size() > 0 && backstack.contains(newBackstack.get(0)));
+
         removeAllExceptVisibleAndUnowned();
         ensureOrderedTransactionIndices(newBackstack);
 
@@ -360,18 +416,27 @@ public abstract class Router {
             boolean visibleTransactionsChanged = !backstacksAreEqual(newVisibleTransactions, oldVisibleTransactions);
             if (visibleTransactionsChanged) {
                 RouterTransaction rootTransaction = oldVisibleTransactions.size() > 0 ? oldVisibleTransactions.get(0) : null;
-                performControllerChange(newVisibleTransactions.get(0), rootTransaction, true, changeHandler);
-
-                for (int i = oldVisibleTransactions.size() - 1; i > 0; i--) {
-                    RouterTransaction transaction = oldVisibleTransactions.get(i);
-                    ControllerChangeHandler localHandler = changeHandler != null ? changeHandler.copy() : new SimpleSwapChangeHandler();
-                    localHandler.setForceRemoveViewOnPush(true);
-                    performControllerChange(null, transaction, true, localHandler);
+                // Replace the old root with the new one
+                if (rootTransaction == null || rootTransaction.controller != newVisibleTransactions.get(0).controller) {
+                    performControllerChange(newVisibleTransactions.get(0), rootTransaction, newRootRequiresPush, changeHandler);
                 }
 
+                // Remove all visible controllers that were previously on the backstack
+                for (int i = oldVisibleTransactions.size() - 1; i > 0; i--) {
+                    RouterTransaction transaction = oldVisibleTransactions.get(i);
+                    if (!newVisibleTransactions.contains(transaction)) {
+                        ControllerChangeHandler localHandler = changeHandler != null ? changeHandler.copy() : new SimpleSwapChangeHandler();
+                        localHandler.setForceRemoveViewOnPush(true);
+                        performControllerChange(null, transaction, newRootRequiresPush, localHandler);
+                    }
+                }
+
+                // Add any new controllers to the backstack
                 for (int i = 1; i < newVisibleTransactions.size(); i++) {
                     RouterTransaction transaction = newVisibleTransactions.get(i);
-                    performControllerChange(transaction, newVisibleTransactions.get(i - 1), true, transaction.pushChangeHandler());
+                    if (!oldVisibleTransactions.contains(transaction)) {
+                        performControllerChange(transaction, newVisibleTransactions.get(i - 1), true, transaction.pushChangeHandler());
+                    }
                 }
             }
 
@@ -394,6 +459,7 @@ public abstract class Router {
      *
      * @param changeListener The listener
      */
+    @SuppressWarnings("WeakerAccess")
     public void addChangeListener(@NonNull ControllerChangeListener changeListener) {
         if (!changeListeners.contains(changeListener)) {
             changeListeners.add(changeListener);
@@ -405,6 +471,7 @@ public abstract class Router {
      *
      * @param changeListener The listener to be removed
      */
+    @SuppressWarnings("WeakerAccess")
     public void removeChangeListener(@NonNull ControllerChangeListener changeListener) {
         changeListeners.remove(changeListener);
     }
@@ -414,6 +481,8 @@ public abstract class Router {
      */
     @UiThread
     public void rebindIfNeeded() {
+        ThreadUtils.ensureMainThread();
+
         Iterator<RouterTransaction> backstackIterator = backstack.reverseIterator();
         while (backstackIterator.hasNext()) {
             RouterTransaction transaction = backstackIterator.next();
@@ -495,7 +564,7 @@ public abstract class Router {
         container = null;
     }
 
-    public void prepareForHostDetach() {
+    void prepareForHostDetach() {
         for (RouterTransaction transaction : backstack) {
             if (ControllerChangeHandler.completePushImmediately(transaction.controller.getInstanceId())) {
                 transaction.controller.setNeedsAttach();
@@ -516,6 +585,7 @@ public abstract class Router {
 
     public void restoreInstanceState(@NonNull Bundle savedInstanceState) {
         Bundle backstackBundle = savedInstanceState.getParcelable(KEY_BACKSTACK);
+        //noinspection ConstantConditions
         backstack.restoreInstanceState(backstackBundle);
         popsLastView = savedInstanceState.getBoolean(KEY_POPS_LAST_VIEW);
 
@@ -561,16 +631,25 @@ public abstract class Router {
     }
 
     private void popToTransaction(@NonNull RouterTransaction transaction, @Nullable ControllerChangeHandler changeHandler) {
-        RouterTransaction topTransaction = backstack.peek();
-        List<RouterTransaction> poppedTransactions = backstack.popTo(transaction);
-        trackDestroyingControllers(poppedTransactions);
+        if (backstack.size() > 0) {
+            RouterTransaction topTransaction = backstack.peek();
+
+            List<RouterTransaction> updatedBackstack = new ArrayList<>();
+            Iterator<RouterTransaction> backstackIterator = backstack.reverseIterator();
+            while (backstackIterator.hasNext()) {
+                RouterTransaction existingTransaction = backstackIterator.next();
+                updatedBackstack.add(existingTransaction);
+                if (existingTransaction == transaction) {
+                    break;
+                }
+            }
 
-        if (poppedTransactions.size() > 0) {
             if (changeHandler == null) {
+                //noinspection ConstantConditions
                 changeHandler = topTransaction.popChangeHandler();
             }
 
-            performControllerChange(backstack.peek(), topTransaction, false, changeHandler);
+            setBackstack(updatedBackstack, changeHandler);
         }
     }
 
@@ -636,7 +715,7 @@ public abstract class Router {
         ControllerChangeHandler.executeChange(toController, fromController, isPush, container, changeHandler, changeListeners);
     }
 
-    private void pushToBackstack(@NonNull RouterTransaction entry) {
+    protected void pushToBackstack(@NonNull RouterTransaction entry) {
         backstack.push(entry);
     }
 
@@ -717,6 +796,7 @@ public abstract class Router {
             RouterTransaction transaction = backstackIterator.next();
             transactions.add(transaction);
 
+            //noinspection ConstantConditions
             if (transaction.pushChangeHandler() == null || transaction.pushChangeHandler().removesFromViewOnPush()) {
                 break;
             }
@@ -748,6 +828,8 @@ public abstract class Router {
     abstract void startActivity(@NonNull Intent intent);
     abstract void startActivityForResult(@NonNull String instanceId, @NonNull Intent intent, int requestCode);
     abstract void startActivityForResult(@NonNull String instanceId, @NonNull Intent intent, int requestCode, @Nullable Bundle options);
+    abstract void startIntentSenderForResult(@NonNull String instanceId, @NonNull IntentSender intent, int requestCode, @Nullable Intent fillInIntent, int flagsMask,
+                                             int flagsValues, int extraFlags, @Nullable Bundle options) throws IntentSender.SendIntentException;
     abstract void registerForActivityResult(@NonNull String instanceId, int requestCode);
     abstract void unregisterForActivityResults(@NonNull String instanceId);
     abstract void requestPermissions(@NonNull String instanceId, @NonNull String[] permissions, int requestCode);

conductor/src/main/java/com/bluelinelabs/conductor/changehandler/AnimatorChangeHandler.java

@@ -122,13 +122,20 @@ public abstract class AnimatorChangeHandler extends ControllerChangeHandler {
             if (to.getWidth() <= 0 && to.getHeight() <= 0) {
                 readyToAnimate = false;
                 to.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
+                    boolean hasRun;
+
                     @Override
                     public boolean onPreDraw() {
                         final ViewTreeObserver observer = to.getViewTreeObserver();
                         if (observer.isAlive()) {
                             observer.removeOnPreDrawListener(this);
                         }
-                        performAnimation(container, from, to, isPush, addingToView, changeListener);
+
+                        // Apparently this gets called multiple times, even if removeOnPreDrawListener is called successfully.
+                        if (!hasRun) {
+                            hasRun = true;
+                            performAnimation(container, from, to, isPush, addingToView, changeListener);
+                        }
                         return true;
                     }
                 });
@@ -160,6 +167,16 @@ public abstract class AnimatorChangeHandler extends ControllerChangeHandler {
             complete(changeListener, null);
             return;
         }
+        if (needsImmediateCompletion) {
+            if (from != null && (!isPush || removesFromViewOnPush)) {
+                container.removeView(from);
+            }
+            complete(changeListener, null);
+            if (isPush && from != null) {
+                resetFromView(from);
+            }
+            return;
+        }
 
         animator = getAnimator(container, from, to, isPush, toAddedToContainer);
 

conductor/src/main/java/com/bluelinelabs/conductor/changehandler/FadeChangeHandler.java

@@ -37,7 +37,7 @@ public class FadeChangeHandler extends AnimatorChangeHandler {
             animator.play(ObjectAnimator.ofFloat(to, View.ALPHA, start, 1));
         }
 
-        if (from != null) {
+        if (from != null && removesFromViewOnPush()) {
             animator.play(ObjectAnimator.ofFloat(from, View.ALPHA, 0));
         }
 

conductor/src/main/java/com/bluelinelabs/conductor/changehandler/HorizontalChangeHandler.java

@@ -46,7 +46,7 @@ public class HorizontalChangeHandler extends AnimatorChangeHandler {
             }
             if (to != null) {
                 // Allow this to have a nice transition when coming off an aborted push animation
-                float fromLeft = from != null ? from.getX() : 0;
+                float fromLeft = from != null ? from.getTranslationX() : 0;
                 animatorSet.play(ObjectAnimator.ofFloat(to, View.TRANSLATION_X, fromLeft - to.getWidth(), 0));
             }
         }

conductor/src/main/java/com/bluelinelabs/conductor/changehandler/TransitionChangeHandler.java

@@ -19,15 +19,20 @@ import com.bluelinelabs.conductor.ControllerChangeHandler;
 @TargetApi(Build.VERSION_CODES.LOLLIPOP)
 public abstract class TransitionChangeHandler extends ControllerChangeHandler {
 
+    public interface OnTransitionPreparedListener {
+        void onPrepared();
+    }
+
     private boolean canceled;
+    private boolean needsImmediateCompletion;
 
     /**
      * Should be overridden to return the Transition to use while replacing Views.
      *
      * @param container The container these Views are hosted in
-     * @param from The previous View in the container or {@code null} if there was no Controller before this transition
-     * @param to The next View that should be put in the container or {@code null} if no Controller is being transitioned to
-     * @param isPush True if this is a push transaction, false if it's a pop
+     * @param from      The previous View in the container or {@code null} if there was no Controller before this transition
+     * @param to        The next View that should be put in the container or {@code null} if no Controller is being transitioned to
+     * @param isPush    True if this is a push transaction, false if it's a pop
      */
     @NonNull
     protected abstract Transition getTransition(@NonNull ViewGroup container, @Nullable View from, @Nullable View to, boolean isPush);
@@ -40,13 +45,25 @@ public abstract class TransitionChangeHandler extends ControllerChangeHandler {
     }
 
     @Override
-    public void performChange(@NonNull final ViewGroup container, @Nullable View from, @Nullable View to, boolean isPush, @NonNull final ControllerChangeCompletedListener changeListener) {
+    public void completeImmediately() {
+        super.completeImmediately();
+
+        needsImmediateCompletion = true;
+    }
+
+    @Override
+    public void performChange(@NonNull final ViewGroup container, @Nullable final View from, @Nullable final View to, final boolean isPush, @NonNull final ControllerChangeCompletedListener changeListener) {
         if (canceled) {
             changeListener.onChangeCompleted();
             return;
         }
+        if (needsImmediateCompletion) {
+            executePropertyChanges(container, from, to, null, isPush);
+            changeListener.onChangeCompleted();
+            return;
+        }
 
-        Transition transition = getTransition(container, from, to, isPush);
+        final Transition transition = getTransition(container, from, to, isPush);
         transition.addListener(new TransitionListener() {
             @Override
             public void onTransitionStart(Transition transition) { }
@@ -68,8 +85,48 @@ public abstract class TransitionChangeHandler extends ControllerChangeHandler {
             public void onTransitionResume(Transition transition) { }
         });
 
-        TransitionManager.beginDelayedTransition(container, transition);
-        if (from != null) {
+        prepareForTransition(container, from, to, transition, isPush, new OnTransitionPreparedListener() {
+            @Override
+            public void onPrepared() {
+                if (!canceled) {
+                    TransitionManager.beginDelayedTransition(container, transition);
+                    executePropertyChanges(container, from, to, transition, isPush);
+                }
+            }
+        });
+    }
+
+    @Override
+    public boolean removesFromViewOnPush() {
+        return true;
+    }
+
+    /**
+     * Called before a transition occurs. This can be used to reorder views, set their transition names, etc. The transition will begin
+     * when {@code onTransitionPreparedListener} is called.
+     *
+     * @param container  The container these Views are hosted in
+     * @param from       The previous View in the container or {@code null} if there was no Controller before this transition
+     * @param to         The next View that should be put in the container or {@code null} if no Controller is being transitioned to
+     * @param transition The transition that is being prepared for
+     * @param isPush     True if this is a push transaction, false if it's a pop
+     */
+    public void prepareForTransition(@NonNull ViewGroup container, @Nullable View from, @Nullable View to, @NonNull Transition transition, boolean isPush, @NonNull OnTransitionPreparedListener onTransitionPreparedListener) {
+        onTransitionPreparedListener.onPrepared();
+    }
+
+    /**
+     * This should set all view properties needed for the transition to work properly. By default it removes the "from" view
+     * and adds the "to" view.
+     *
+     * @param container  The container these Views are hosted in
+     * @param from       The previous View in the container or {@code null} if there was no Controller before this transition
+     * @param to         The next View that should be put in the container or {@code null} if no Controller is being transitioned to
+     * @param transition The transition with which {@code TransitionManager.beginDelayedTransition} has been called. This will be null only if another ControllerChangeHandler immediately overrides this one.
+     * @param isPush     True if this is a push transaction, false if it's a pop
+     */
+    public void executePropertyChanges(@NonNull ViewGroup container, @Nullable View from, @Nullable View to, @Nullable Transition transition, boolean isPush) {
+        if (from != null && (removesFromViewOnPush() || !isPush) && from.getParent() == container) {
             container.removeView(from);
         }
         if (to != null && to.getParent() == null) {
@@ -77,9 +134,4 @@ public abstract class TransitionChangeHandler extends ControllerChangeHandler {
         }
     }
 
-    @Override
-    public final boolean removesFromViewOnPush() {
-        return true;
-    }
-
 }

conductor/src/main/java/com/bluelinelabs/conductor/changehandler/TransitionChangeHandlerCompat.java

@@ -7,6 +7,7 @@ import android.support.annotation.Nullable;
 import android.view.View;
 import android.view.ViewGroup;
 
+import com.bluelinelabs.conductor.Controller;
 import com.bluelinelabs.conductor.ControllerChangeHandler;
 import com.bluelinelabs.conductor.internal.ClassUtils;
 
@@ -78,4 +79,19 @@ public class TransitionChangeHandlerCompat extends ControllerChangeHandler {
         }
     }
 
+    @Override
+    public void onAbortPush(@NonNull ControllerChangeHandler newHandler, @Nullable Controller newTop) {
+        changeHandler.onAbortPush(newHandler, newTop);
+    }
+
+    @Override
+    public void completeImmediately() {
+        changeHandler.completeImmediately();
+    }
+
+    @Override
+    public void setForceRemoveViewOnPush(boolean force) {
+        changeHandler.setForceRemoveViewOnPush(force);
+    }
+
 }

conductor/src/main/java/com/bluelinelabs/conductor/internal/LifecycleHandler.java

@@ -6,6 +6,7 @@ import android.app.Application.ActivityLifecycleCallbacks;
 import android.app.Fragment;
 import android.content.Context;
 import android.content.Intent;
+import android.content.IntentSender;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Parcel;
@@ -283,6 +284,14 @@ public class LifecycleHandler extends Fragment implements ActivityLifecycleCallb
         startActivityForResult(intent, requestCode, options);
     }
 
+    @TargetApi(Build.VERSION_CODES.N)
+    public void startIntentSenderForResult(@NonNull String instanceId, @NonNull IntentSender intent, int requestCode,
+                                           @Nullable Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags,
+                                           @Nullable Bundle options) throws IntentSender.SendIntentException {
+        registerForActivityResult(instanceId, requestCode);
+        startIntentSenderForResult(intent, requestCode, fillInIntent, flagsMask, flagsValues, extraFlags, options);
+    }
+
     @TargetApi(Build.VERSION_CODES.M)
     public void requestPermissions(@NonNull String instanceId, @NonNull String[] permissions, int requestCode) {
         if (attached) {

conductor/src/main/java/com/bluelinelabs/conductor/internal/ThreadUtils.java

@@ -0,0 +1,20 @@
+package com.bluelinelabs.conductor.internal;
+
+import android.os.Looper;
+import android.util.AndroidRuntimeException;
+
+public class ThreadUtils {
+
+    public static void ensureMainThread() {
+        if (Looper.getMainLooper().getThread() != Thread.currentThread()) {
+            throw new CalledFromWrongThreadException("Methods that affect the view hierarchy can can only be called from the main thread.");
+        }
+    }
+
+    private static final class CalledFromWrongThreadException extends AndroidRuntimeException {
+        CalledFromWrongThreadException(String msg) {
+            super(msg);
+        }
+    }
+
+}

conductor/src/main/java/com/bluelinelabs/conductor/internal/ViewAttachHandler.java

@@ -23,7 +23,7 @@ public class ViewAttachHandler implements OnAttachStateChangeListener {
     }
 
     private boolean rootAttached = false;
-    boolean childrenAttached = false;
+    private boolean childrenAttached = false;
     private boolean activityStopped = false;
     private ReportedState reportedState = ReportedState.VIEW_DETACHED;
     private ViewAttachListener attachListener;
@@ -55,7 +55,7 @@ public class ViewAttachHandler implements OnAttachStateChangeListener {
         rootAttached = false;
         if (childrenAttached) {
             childrenAttached = false;
-            reportDetached();
+            reportDetached(false);
         }
     }
 
@@ -78,34 +78,33 @@ public class ViewAttachHandler implements OnAttachStateChangeListener {
 
     public void onActivityStopped() {
         activityStopped = true;
-        reportDetached();
+        reportDetached(true);
     }
 
-    void reportAttached() {
+    private void reportAttached() {
         if (rootAttached && childrenAttached && !activityStopped && reportedState != ReportedState.ATTACHED) {
             reportedState = ReportedState.ATTACHED;
             attachListener.onAttached();
         }
     }
 
-    void reportDetached() {
+    private void reportDetached(boolean detachedForActivity) {
         boolean wasDetachedForActivity = reportedState == ReportedState.ACTIVITY_STOPPED;
-        boolean isDetachedForActivity = rootAttached;
 
-        if (isDetachedForActivity) {
+        if (detachedForActivity) {
             reportedState = ReportedState.ACTIVITY_STOPPED;
         } else {
             reportedState = ReportedState.VIEW_DETACHED;
         }
 
-        if (wasDetachedForActivity && !isDetachedForActivity) {
+        if (wasDetachedForActivity && !detachedForActivity) {
             attachListener.onViewDetachAfterStop();
         } else {
-            attachListener.onDetached(isDetachedForActivity);
+            attachListener.onDetached(detachedForActivity);
         }
     }
 
-    void listenForDeepestChildAttach(final View view, final ChildAttachListener attachListener) {
+    private void listenForDeepestChildAttach(final View view, final ChildAttachListener attachListener) {
         if (!(view instanceof ViewGroup)) {
             attachListener.onAttached();
             return;

conductor/src/test/java/com/bluelinelabs/conductor/ControllerLifecycleActivityReferenceTests.java

@@ -6,7 +6,6 @@ import android.view.View;
 import android.view.ViewGroup;
 
 import com.bluelinelabs.conductor.util.ActivityProxy;
-import com.bluelinelabs.conductor.util.ListUtils;
 import com.bluelinelabs.conductor.util.MockChangeHandler;
 import com.bluelinelabs.conductor.util.TestController;
 
@@ -17,6 +16,8 @@ import org.robolectric.RobolectricTestRunner;
 import org.robolectric.annotation.Config;
 
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 import static org.junit.Assert.assertEquals;
@@ -62,12 +63,12 @@ public class ControllerLifecycleActivityReferenceTests {
                 .pushChangeHandler(MockChangeHandler.defaultHandler())
                 .popChangeHandler(MockChangeHandler.defaultHandler()));
 
-        assertEquals(ListUtils.listOf(true), listener.changeEndReferences);
-        assertEquals(ListUtils.listOf(true), listener.postCreateViewReferences);
-        assertEquals(ListUtils.listOf(true), listener.postAttachReferences);
-        assertEquals(ListUtils.listOf(), listener.postDetachReferences);
-        assertEquals(ListUtils.listOf(), listener.postDestroyViewReferences);
-        assertEquals(ListUtils.listOf(), listener.postDestroyReferences);
+        assertEquals(Collections.singletonList(true), listener.changeEndReferences);
+        assertEquals(Collections.singletonList(true), listener.postCreateViewReferences);
+        assertEquals(Collections.singletonList(true), listener.postAttachReferences);
+        assertEquals(Collections.emptyList(), listener.postDetachReferences);
+        assertEquals(Collections.emptyList(), listener.postDestroyViewReferences);
+        assertEquals(Collections.emptyList(), listener.postDestroyReferences);
     }
 
     @Test
@@ -89,12 +90,12 @@ public class ControllerLifecycleActivityReferenceTests {
                 .pushChangeHandler(MockChangeHandler.defaultHandler())
                 .popChangeHandler(MockChangeHandler.defaultHandler()));
 
-        assertEquals(ListUtils.listOf(true), listener.changeEndReferences);
-        assertEquals(ListUtils.listOf(true), listener.postCreateViewReferences);
-        assertEquals(ListUtils.listOf(true), listener.postAttachReferences);
-        assertEquals(ListUtils.listOf(), listener.postDetachReferences);
-        assertEquals(ListUtils.listOf(), listener.postDestroyViewReferences);
-        assertEquals(ListUtils.listOf(), listener.postDestroyReferences);
+        assertEquals(Collections.singletonList(true), listener.changeEndReferences);
+        assertEquals(Collections.singletonList(true), listener.postCreateViewReferences);
+        assertEquals(Collections.singletonList(true), listener.postAttachReferences);
+        assertEquals(Collections.emptyList(), listener.postDetachReferences);
+        assertEquals(Collections.emptyList(), listener.postDestroyViewReferences);
+        assertEquals(Collections.emptyList(), listener.postDestroyReferences);
     }
 
     @Test
@@ -110,12 +111,12 @@ public class ControllerLifecycleActivityReferenceTests {
 
         router.popCurrentController();
 
-        assertEquals(ListUtils.listOf(true, true), listener.changeEndReferences);
-        assertEquals(ListUtils.listOf(true), listener.postCreateViewReferences);
-        assertEquals(ListUtils.listOf(true), listener.postAttachReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDetachReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDestroyViewReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDestroyReferences);
+        assertEquals(Arrays.asList(true, true), listener.changeEndReferences);
+        assertEquals(Collections.singletonList(true), listener.postCreateViewReferences);
+        assertEquals(Collections.singletonList(true), listener.postAttachReferences);
+        assertEquals(Collections.singletonList(true), listener.postDetachReferences);
+        assertEquals(Collections.singletonList(true), listener.postDestroyViewReferences);
+        assertEquals(Collections.singletonList(true), listener.postDestroyReferences);
     }
 
     @Test
@@ -139,12 +140,12 @@ public class ControllerLifecycleActivityReferenceTests {
 
         childRouter.popCurrentController();
 
-        assertEquals(ListUtils.listOf(true, true), listener.changeEndReferences);
-        assertEquals(ListUtils.listOf(true), listener.postCreateViewReferences);
-        assertEquals(ListUtils.listOf(true), listener.postAttachReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDetachReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDestroyViewReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDestroyReferences);
+        assertEquals(Arrays.asList(true, true), listener.changeEndReferences);
+        assertEquals(Collections.singletonList(true), listener.postCreateViewReferences);
+        assertEquals(Collections.singletonList(true), listener.postAttachReferences);
+        assertEquals(Collections.singletonList(true), listener.postDetachReferences);
+        assertEquals(Collections.singletonList(true), listener.postDestroyViewReferences);
+        assertEquals(Collections.singletonList(true), listener.postDestroyReferences);
     }
 
     @Test
@@ -168,12 +169,12 @@ public class ControllerLifecycleActivityReferenceTests {
 
         router.popCurrentController();
 
-        assertEquals(ListUtils.listOf(true), listener.changeEndReferences);
-        assertEquals(ListUtils.listOf(true), listener.postCreateViewReferences);
-        assertEquals(ListUtils.listOf(true), listener.postAttachReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDetachReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDestroyViewReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDestroyReferences);
+        assertEquals(Collections.singletonList(true), listener.changeEndReferences);
+        assertEquals(Collections.singletonList(true), listener.postCreateViewReferences);
+        assertEquals(Collections.singletonList(true), listener.postAttachReferences);
+        assertEquals(Collections.singletonList(true), listener.postDetachReferences);
+        assertEquals(Collections.singletonList(true), listener.postDestroyViewReferences);
+        assertEquals(Collections.singletonList(true), listener.postDestroyReferences);
     }
 
     @Test
@@ -189,12 +190,12 @@ public class ControllerLifecycleActivityReferenceTests {
 
         activityProxy.pause().stop(false).destroy();
 
-        assertEquals(ListUtils.listOf(true), listener.changeEndReferences);
-        assertEquals(ListUtils.listOf(true), listener.postCreateViewReferences);
-        assertEquals(ListUtils.listOf(true), listener.postAttachReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDetachReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDestroyViewReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDestroyReferences);
+        assertEquals(Collections.singletonList(true), listener.changeEndReferences);
+        assertEquals(Collections.singletonList(true), listener.postCreateViewReferences);
+        assertEquals(Collections.singletonList(true), listener.postAttachReferences);
+        assertEquals(Collections.singletonList(true), listener.postDetachReferences);
+        assertEquals(Collections.singletonList(true), listener.postDestroyViewReferences);
+        assertEquals(Collections.singletonList(true), listener.postDestroyReferences);
     }
 
     @Test
@@ -218,21 +219,21 @@ public class ControllerLifecycleActivityReferenceTests {
 
         activityProxy.pause().stop(false).destroy();
 
-        assertEquals(ListUtils.listOf(true), listener.changeEndReferences);
-        assertEquals(ListUtils.listOf(true), listener.postCreateViewReferences);
-        assertEquals(ListUtils.listOf(true), listener.postAttachReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDetachReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDestroyViewReferences);
-        assertEquals(ListUtils.listOf(true), listener.postDestroyReferences);
+        assertEquals(Collections.singletonList(true), listener.changeEndReferences);
+        assertEquals(Collections.singletonList(true), listener.postCreateViewReferences);
+        assertEquals(Collections.singletonList(true), listener.postAttachReferences);
+        assertEquals(Collections.singletonList(true), listener.postDetachReferences);
+        assertEquals(Collections.singletonList(true), listener.postDestroyViewReferences);
+        assertEquals(Collections.singletonList(true), listener.postDestroyReferences);
     }
 
     static class ActivityReferencingLifecycleListener extends Controller.LifecycleListener {
-        List<Boolean> changeEndReferences = new ArrayList<>();
-        List<Boolean> postCreateViewReferences = new ArrayList<>();
-        List<Boolean> postAttachReferences = new ArrayList<>();
-        List<Boolean> postDetachReferences = new ArrayList<>();
-        List<Boolean> postDestroyViewReferences = new ArrayList<>();
-        List<Boolean> postDestroyReferences = new ArrayList<>();
+        final List<Boolean> changeEndReferences = new ArrayList<>();
+        final List<Boolean> postCreateViewReferences = new ArrayList<>();
+        final List<Boolean> postAttachReferences = new ArrayList<>();
+        final List<Boolean> postDetachReferences = new ArrayList<>();
+        final List<Boolean> postDestroyViewReferences = new ArrayList<>();
+        final List<Boolean> postDestroyReferences = new ArrayList<>();
 
         @Override
         public void onChangeEnd(@NonNull Controller controller, @NonNull ControllerChangeHandler changeHandler, @NonNull ControllerChangeType changeType) {

conductor/src/test/java/com/bluelinelabs/conductor/RouterChangeHandlerTests.java

@@ -3,7 +3,6 @@ package com.bluelinelabs.conductor;
 import android.view.View;
 
 import com.bluelinelabs.conductor.util.ActivityProxy;
-import com.bluelinelabs.conductor.util.ListUtils;
 import com.bluelinelabs.conductor.util.MockChangeHandler;
 import com.bluelinelabs.conductor.util.TestController;
 
@@ -13,6 +12,7 @@ import org.junit.runner.RunWith;
 import org.robolectric.RobolectricTestRunner;
 import org.robolectric.annotation.Config;
 
+import java.util.Arrays;
 import java.util.List;
 
 import static org.junit.Assert.assertEquals;
@@ -142,7 +142,7 @@ public class RouterChangeHandlerTests {
         TestController newController2 = new TestController();
         MockChangeHandler setBackstackHandler = MockChangeHandler.taggedHandler("setBackstackHandler", true);
 
-        List<RouterTransaction> newBackstack = ListUtils.listOf(
+        List<RouterTransaction> newBackstack = Arrays.asList(
                 RouterTransaction.with(newController1),
                 RouterTransaction.with(newController2)
         );
@@ -194,7 +194,7 @@ public class RouterChangeHandlerTests {
         TestController newController2 = new TestController();
         MockChangeHandler setBackstackHandler = MockChangeHandler.taggedHandler("setBackstackHandler", true);
 
-        List<RouterTransaction> newBackstack = ListUtils.listOf(
+        List<RouterTransaction> newBackstack = Arrays.asList(
                 RouterTransaction.with(newController1),
                 RouterTransaction.with(newController2).pushChangeHandler(MockChangeHandler.noRemoveViewOnPushHandler())
         );

conductor/src/test/java/com/bluelinelabs/conductor/RouterTests.java

@@ -2,8 +2,9 @@ package com.bluelinelabs.conductor;
 
 import android.view.ViewGroup;
 
+import com.bluelinelabs.conductor.changehandler.FadeChangeHandler;
+import com.bluelinelabs.conductor.changehandler.HorizontalChangeHandler;
 import com.bluelinelabs.conductor.util.ActivityProxy;
-import com.bluelinelabs.conductor.util.ListUtils;
 import com.bluelinelabs.conductor.util.MockChangeHandler;
 import com.bluelinelabs.conductor.util.TestController;
 
@@ -13,6 +14,7 @@ import org.junit.runner.RunWith;
 import org.robolectric.RobolectricTestRunner;
 import org.robolectric.annotation.Config;
 
+import java.util.Arrays;
 import java.util.List;
 
 import static org.junit.Assert.assertEquals;
@@ -189,7 +191,7 @@ public class RouterTests {
         RouterTransaction middleTransaction = RouterTransaction.with(new TestController());
         RouterTransaction topTransaction = RouterTransaction.with(new TestController());
 
-        List<RouterTransaction> backstack = ListUtils.listOf(rootTransaction, middleTransaction, topTransaction);
+        List<RouterTransaction> backstack = Arrays.asList(rootTransaction, middleTransaction, topTransaction);
         router.setBackstack(backstack, null);
 
         assertEquals(3, router.getBackstackSize());
@@ -210,7 +212,7 @@ public class RouterTests {
         RouterTransaction middleTransaction = RouterTransaction.with(new TestController());
         RouterTransaction topTransaction = RouterTransaction.with(new TestController());
 
-        List<RouterTransaction> backstack = ListUtils.listOf(rootTransaction, middleTransaction, topTransaction);
+        List<RouterTransaction> backstack = Arrays.asList(rootTransaction, middleTransaction, topTransaction);
         router.setBackstack(backstack, null);
 
         assertEquals(3, router.getBackstackSize());
@@ -241,7 +243,7 @@ public class RouterTests {
         RouterTransaction middleTransaction = RouterTransaction.with(new TestController()).pushChangeHandler(MockChangeHandler.noRemoveViewOnPushHandler());
         RouterTransaction topTransaction = RouterTransaction.with(new TestController()).pushChangeHandler(MockChangeHandler.noRemoveViewOnPushHandler());
 
-        List<RouterTransaction> backstack = ListUtils.listOf(rootTransaction, middleTransaction, topTransaction);
+        List<RouterTransaction> backstack = Arrays.asList(rootTransaction, middleTransaction, topTransaction);
         router.setBackstack(backstack, null);
 
         assertEquals(3, router.getBackstackSize());
@@ -258,12 +260,54 @@ public class RouterTests {
         assertTrue(topTransaction.controller.isAttached());
     }
 
+    @Test
+    public void testPopToRoot() {
+        RouterTransaction rootTransaction = RouterTransaction.with(new TestController());
+        RouterTransaction transaction1 = RouterTransaction.with(new TestController());
+        RouterTransaction transaction2 = RouterTransaction.with(new TestController());
+
+        List<RouterTransaction> backstack = Arrays.asList(rootTransaction, transaction1, transaction2);
+        router.setBackstack(backstack, null);
+
+        assertEquals(3, router.getBackstackSize());
+
+        router.popToRoot();
+
+        assertEquals(1, router.getBackstackSize());
+        assertEquals(rootTransaction, router.getBackstack().get(0));
+
+        assertTrue(rootTransaction.controller.isAttached());
+        assertFalse(transaction1.controller.isAttached());
+        assertFalse(transaction2.controller.isAttached());
+    }
+
+    @Test
+    public void testPopToRootWithNoRemoveViewOnPush() {
+        RouterTransaction rootTransaction = RouterTransaction.with(new TestController()).pushChangeHandler(new HorizontalChangeHandler(false));
+        RouterTransaction transaction1 = RouterTransaction.with(new TestController()).pushChangeHandler(new HorizontalChangeHandler(false));
+        RouterTransaction transaction2 = RouterTransaction.with(new TestController()).pushChangeHandler(new HorizontalChangeHandler(false));
+
+        List<RouterTransaction> backstack = Arrays.asList(rootTransaction, transaction1, transaction2);
+        router.setBackstack(backstack, null);
+
+        assertEquals(3, router.getBackstackSize());
+
+        router.popToRoot();
+
+        assertEquals(1, router.getBackstackSize());
+        assertEquals(rootTransaction, router.getBackstack().get(0));
+
+        assertTrue(rootTransaction.controller.isAttached());
+        assertFalse(transaction1.controller.isAttached());
+        assertFalse(transaction2.controller.isAttached());
+    }
+
     @Test
     public void testReplaceTopController() {
         RouterTransaction rootTransaction = RouterTransaction.with(new TestController());
         RouterTransaction topTransaction = RouterTransaction.with(new TestController());
 
-        List<RouterTransaction> backstack = ListUtils.listOf(rootTransaction, topTransaction);
+        List<RouterTransaction> backstack = Arrays.asList(rootTransaction, topTransaction);
         router.setBackstack(backstack, null);
 
         assertEquals(2, router.getBackstackSize());
@@ -287,7 +331,7 @@ public class RouterTests {
         RouterTransaction rootTransaction = RouterTransaction.with(new TestController());
         RouterTransaction topTransaction = RouterTransaction.with(new TestController()).pushChangeHandler(MockChangeHandler.noRemoveViewOnPushHandler());
 
-        List<RouterTransaction> backstack = ListUtils.listOf(rootTransaction, topTransaction);
+        List<RouterTransaction> backstack = Arrays.asList(rootTransaction, topTransaction);
         router.setBackstack(backstack, null);
 
         assertEquals(2, router.getBackstackSize());
@@ -319,13 +363,13 @@ public class RouterTests {
         RouterTransaction transaction1 = RouterTransaction.with(new TestController());
         RouterTransaction transaction2 = RouterTransaction.with(new TestController());
 
-        List<RouterTransaction> backstack = ListUtils.listOf(transaction1, transaction2);
+        List<RouterTransaction> backstack = Arrays.asList(transaction1, transaction2);
         router.setBackstack(backstack, null);
 
         assertEquals(1, transaction1.transactionIndex);
         assertEquals(2, transaction2.transactionIndex);
 
-        backstack = ListUtils.listOf(transaction2, transaction1);
+        backstack = Arrays.asList(transaction2, transaction1);
         router.setBackstack(backstack, null);
 
         assertEquals(1, transaction2.transactionIndex);
@@ -350,13 +394,13 @@ public class RouterTests {
         RouterTransaction transaction1 = RouterTransaction.with(new TestController());
         RouterTransaction transaction2 = RouterTransaction.with(new TestController());
 
-        List<RouterTransaction> backstack = ListUtils.listOf(transaction1, transaction2);
+        List<RouterTransaction> backstack = Arrays.asList(transaction1, transaction2);
         childRouter.setBackstack(backstack, null);
 
         assertEquals(2, transaction1.transactionIndex);
         assertEquals(3, transaction2.transactionIndex);
 
-        backstack = ListUtils.listOf(transaction2, transaction1);
+        backstack = Arrays.asList(transaction2, transaction1);
         childRouter.setBackstack(backstack, null);
 
         assertEquals(2, transaction2.transactionIndex);
@@ -371,4 +415,20 @@ public class RouterTests {
         assertEquals(0, childRouter.getBackstackSize());
     }
 
+    @Test
+    public void testRemovesAllViewsOnDestroy() {
+        Controller controller1 = new TestController();
+        Controller controller2 = new TestController();
+
+        router.setRoot(RouterTransaction.with(controller1));
+        router.pushController(RouterTransaction.with(controller2)
+                .pushChangeHandler(new FadeChangeHandler(false)));
+
+        assertEquals(2, router.container.getChildCount());
+
+        router.destroy(true);
+
+        assertEquals(0, router.container.getChildCount());
+    }
+
 }

conductor/src/test/java/com/bluelinelabs/conductor/ViewLeakTests.java

@@ -0,0 +1,132 @@
+package com.bluelinelabs.conductor;
+
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.view.View;
+import android.view.ViewGroup;
+
+import com.bluelinelabs.conductor.util.ActivityProxy;
+import com.bluelinelabs.conductor.util.TestController;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.annotation.Config;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(manifest = Config.NONE)
+public class ViewLeakTests {
+
+    private ActivityProxy activityProxy;
+    private Router router;
+
+    public void createActivityController(Bundle savedInstanceState) {
+        activityProxy = new ActivityProxy().create(savedInstanceState).start().resume();
+        router = Conductor.attachRouter(activityProxy.getActivity(), activityProxy.getView(), savedInstanceState);
+        if (!router.hasRootController()) {
+            router.setRoot(RouterTransaction.with(new TestController()));
+        }
+    }
+
+    @Before
+    public void setup() {
+        createActivityController(null);
+    }
+
+    @Test
+    public void testPop() {
+        Controller controller = new TestController();
+        router.pushController(RouterTransaction.with(controller));
+
+        assertNotNull(controller.getView());
+
+        router.popCurrentController();
+
+        assertNull(controller.getView());
+    }
+
+    @Test
+    public void testPopWhenPushNeverAdded() {
+        Controller controller = new TestController();
+        router.pushController(RouterTransaction.with(controller).pushChangeHandler(new NeverAddChangeHandler()));
+
+        assertNotNull(controller.getView());
+
+        router.popCurrentController();
+
+        assertNull(controller.getView());
+    }
+
+    @Test
+    public void testPopWhenPushNeverCompleted() {
+        Controller controller = new TestController();
+        router.pushController(RouterTransaction.with(controller).pushChangeHandler(new NeverCompleteChangeHandler()));
+
+        assertNotNull(controller.getView());
+
+        router.popCurrentController();
+
+        assertNull(controller.getView());
+    }
+
+    @Test
+    public void testActivityStop() {
+        Controller controller = new TestController();
+        router.pushController(RouterTransaction.with(controller));
+
+        assertNotNull(controller.getView());
+
+        activityProxy.stop(true);
+
+        assertNull(controller.getView());
+    }
+
+    @Test
+    public void testActivityStopWhenPushNeverCompleted() {
+        Controller controller = new TestController();
+        router.pushController(RouterTransaction.with(controller).pushChangeHandler(new NeverCompleteChangeHandler()));
+
+        assertNotNull(controller.getView());
+
+        activityProxy.stop(true);
+
+        assertNull(controller.getView());
+    }
+
+    @Test
+    public void testActivityDestroyWhenPushNeverAdded() {
+        Controller controller = new TestController();
+        router.pushController(RouterTransaction.with(controller).pushChangeHandler(new NeverAddChangeHandler()));
+
+        assertNotNull(controller.getView());
+
+        activityProxy.stop(true).destroy();
+
+        assertNull(controller.getView());
+    }
+
+    public static class NeverAddChangeHandler extends ControllerChangeHandler {
+        @Override
+        public void performChange(@NonNull final ViewGroup container, @Nullable View from, @Nullable final View to, boolean isPush, @NonNull ControllerChangeCompletedListener changeListener) {
+            if (from != null) {
+                container.removeView(from);
+            }
+        }
+    }
+
+    public static class NeverCompleteChangeHandler extends ControllerChangeHandler {
+        @Override
+        public void performChange(@NonNull ViewGroup container, @Nullable View from, @Nullable View to, boolean isPush, @NonNull ControllerChangeCompletedListener changeListener) {
+            if (from != null) {
+                container.removeView(from);
+            }
+            container.addView(to);
+        }
+    }
+
+}

conductor/src/test/java/com/bluelinelabs/conductor/util/ListUtils.java

@@ -1,16 +0,0 @@
-package com.bluelinelabs.conductor.util;
-
-import java.util.ArrayList;
-import java.util.List;
-
-public class ListUtils {
-
-    public static <T> List<T> listOf(T... elements) {
-        List<T> list = new ArrayList<>();
-        for (T element : elements) {
-            list.add(element);
-        }
-        return list;
-    }
-
-}

demo/build.gradle

@@ -11,8 +11,8 @@ apply plugin: 'com.android.application'
 apply plugin: 'com.neenbedankt.android-apt'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion '24.0.3'
+    compileSdkVersion rootProject.ext.compileSdkVersion
+    buildToolsVersion rootProject.ext.buildToolsVersion
 
     lintOptions {
         abortOnError true
@@ -26,10 +26,11 @@ android {
 
     defaultConfig {
         applicationId "com.bluelinelabs.conductor.demo"
-        minSdkVersion 16
-        targetSdkVersion 25
+        minSdkVersion rootProject.ext.minSdkVersion
+        targetSdkVersion rootProject.ext.targetSdkVersion
         versionCode 1
         versionName "1.0.0"
+        vectorDrawables.useSupportLibrary true
     }
 
     buildTypes {

demo/src/main/java/com/bluelinelabs/conductor/demo/changehandler/FabToDialogTransitionChangeHandler.java

@@ -0,0 +1,110 @@
+package com.bluelinelabs.conductor.demo.changehandler;
+
+import android.annotation.TargetApi;
+import android.os.Build;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.content.ContextCompat;
+import android.transition.Fade;
+import android.transition.Transition;
+import android.transition.TransitionSet;
+import android.view.View;
+import android.view.ViewGroup;
+
+import com.bluelinelabs.conductor.changehandler.TransitionChangeHandler;
+import com.bluelinelabs.conductor.demo.R;
+import com.bluelinelabs.conductor.demo.changehandler.transitions.FabTransform;
+import com.bluelinelabs.conductor.demo.util.AnimUtils;
+
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
+public class FabToDialogTransitionChangeHandler extends TransitionChangeHandler {
+
+    private View fab;
+    private View dialogBackground;
+    private ViewGroup fabParent;
+
+    @NonNull @Override
+    protected Transition getTransition(@NonNull final ViewGroup container, @Nullable final View from, @Nullable final View to, boolean isPush) {
+        Transition backgroundFade = new Fade();
+        backgroundFade.addTarget(R.id.dialog_background);
+
+        Transition fabTransform = new FabTransform(ContextCompat.getColor(container.getContext(), R.color.colorAccent), R.drawable.ic_github_face);
+
+        TransitionSet set = new TransitionSet();
+        set.addTransition(backgroundFade);
+        set.addTransition(fabTransform);
+
+        return set;
+    }
+
+    @Override
+    public void prepareForTransition(@NonNull ViewGroup container, @Nullable View from, @Nullable View to, @NonNull Transition transition, boolean isPush, @NonNull OnTransitionPreparedListener onTransitionPreparedListener) {
+        fab = isPush ? from.findViewById(R.id.fab) : to.findViewById(R.id.fab);
+        fabParent = (ViewGroup)fab.getParent();
+
+        if (!isPush) {
+             /*
+             * Before we transition back we want to remove the fab
+             * in order to add it again for the TransitionManager to be able to detect the change
+             */
+            fabParent.removeView(fab);
+            fab.setVisibility(View.VISIBLE);
+
+             /*
+             * Before we transition back we need to move the dialog's background to the new view
+             * so its fade won't take place over the fab transition
+             */
+            dialogBackground = from.findViewById(R.id.dialog_background);
+            ((ViewGroup)dialogBackground.getParent()).removeView(dialogBackground);
+            fabParent.addView(dialogBackground);
+        }
+
+        onTransitionPreparedListener.onPrepared();
+    }
+
+    @Override
+    public void executePropertyChanges(@NonNull ViewGroup container, @Nullable View from, @Nullable View to, @Nullable Transition transition, boolean isPush) {
+        if (isPush) {
+            fabParent.removeView(fab);
+            container.addView(to);
+
+            /*
+             * After the transition is finished we have to add the fab back to the original container.
+             * Because otherwise we will be lost when trying to transition back.
+             * Set it to invisible because we don't want it to jump back after the transition
+             */
+            AnimUtils.TransitionEndListener endListener = new AnimUtils.TransitionEndListener() {
+                @Override
+                public void onTransitionCompleted(Transition transition) {
+                    fab.setVisibility(View.GONE);
+                    fabParent.addView(fab);
+                    fab = null;
+                    fabParent = null;
+                }
+            };
+            if (transition != null) {
+                transition.addListener(endListener);
+            } else {
+                endListener.onTransitionCompleted(null);
+            }
+        } else {
+            dialogBackground.setVisibility(View.INVISIBLE);
+            fabParent.addView(fab);
+            container.removeView(from);
+
+            AnimUtils.TransitionEndListener endListener = new AnimUtils.TransitionEndListener() {
+                @Override
+                public void onTransitionCompleted(Transition transition) {
+                    fabParent.removeView(dialogBackground);
+                    dialogBackground = null;
+                }
+            };
+            if (transition != null) {
+                transition.addListener(endListener);
+            } else {
+                endListener.onTransitionCompleted(null);
+            }
+        }
+    }
+
+}

demo/src/main/java/com/bluelinelabs/conductor/demo/changehandler/SharedElementDelayingChangeHandler.java

@@ -0,0 +1,163 @@
+package com.bluelinelabs.conductor.demo.changehandler;
+
+import android.annotation.TargetApi;
+import android.os.Build;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.transition.Transition;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.ViewTreeObserver.OnPreDrawListener;
+
+import com.bluelinelabs.conductor.Controller;
+import com.bluelinelabs.conductor.ControllerChangeHandler;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A TransitionChangeHandler that will wait for views with the passed transition names to be fully laid out
+ * before executing. An OnPreDrawListener will be added to the "to" view, then to all of its subviews that
+ * match the transaction names we're interested in. Once all of the views are fully ready, the "to" view
+ * is set to invisible so that it'll fade in nicely, and the views that we want to use as shared elements
+ * are removed from their containers, then immediately re-added within the beginDelayedTransition call so
+ * the system picks them up as shared elements.
+ */
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
+public class SharedElementDelayingChangeHandler extends ArcFadeMoveChangeHandler {
+
+    private static final String KEY_WAIT_FOR_TRANSITION_NAMES = "SharedElementDelayingChangeHandler.waitForTransitionNames";
+
+    private final ArrayList<String> waitForTransitionNames;
+    private final ArrayList<ViewParentPair> removedViews = new ArrayList<>();
+    private OnPreDrawListener onPreDrawListener;
+
+    public SharedElementDelayingChangeHandler() {
+        waitForTransitionNames = new ArrayList<>();
+    }
+
+    public SharedElementDelayingChangeHandler(@NonNull List<String> waitForTransitionNames) {
+        this.waitForTransitionNames = new ArrayList<>(waitForTransitionNames);
+    }
+
+    @Override
+    public void prepareForTransition(@NonNull final ViewGroup container, @Nullable View from, @Nullable final View to, @NonNull Transition transition, boolean isPush, @NonNull final OnTransitionPreparedListener onTransitionPreparedListener) {
+        if (to != null && to.getParent() == null && waitForTransitionNames.size() > 0) {
+            onPreDrawListener = new OnPreDrawListener() {
+                boolean addedSubviewListeners;
+
+                @Override
+                public boolean onPreDraw() {
+                    List<View> foundViews = new ArrayList<>();
+                    for (String transitionName : waitForTransitionNames) {
+                        foundViews.add(getViewWithTransitionName(to, transitionName));
+                    }
+
+                    if (!foundViews.contains(null) && !addedSubviewListeners) {
+                        addedSubviewListeners = true;
+
+                        for (final View view : foundViews) {
+                            view.getViewTreeObserver().addOnPreDrawListener(new OnPreDrawListener() {
+                                @Override
+                                public boolean onPreDraw() {
+                                    view.getViewTreeObserver().removeOnPreDrawListener(this);
+                                    waitForTransitionNames.remove(view.getTransitionName());
+
+                                    ViewGroup parent = (ViewGroup)view.getParent();
+                                    removedViews.add(new ViewParentPair(view, parent));
+                                    parent.removeView(view);
+
+                                    if (waitForTransitionNames.size() == 0) {
+                                        to.getViewTreeObserver().removeOnPreDrawListener(onPreDrawListener);
+
+                                        to.setVisibility(View.INVISIBLE);
+
+                                        onTransitionPreparedListener.onPrepared();
+                                    }
+                                    return true;
+                                }
+                            });
+                        }
+                    }
+
+
+                    return false;
+                }
+            };
+
+            to.getViewTreeObserver().addOnPreDrawListener(onPreDrawListener);
+
+            container.addView(to);
+        } else {
+            onTransitionPreparedListener.onPrepared();
+        }
+    }
+
+    @Override
+    public void executePropertyChanges(@NonNull ViewGroup container, @Nullable View from, @Nullable View to, @Nullable Transition transition, boolean isPush) {
+        if (to != null) {
+            to.setVisibility(View.VISIBLE);
+
+            for (ViewParentPair removedView : removedViews) {
+                removedView.parent.addView(removedView.view);
+            }
+
+            removedViews.clear();
+        }
+
+        super.executePropertyChanges(container, from, to, transition, isPush);
+    }
+
+    @Override
+    public void saveToBundle(@NonNull Bundle bundle) {
+        bundle.putStringArrayList(KEY_WAIT_FOR_TRANSITION_NAMES, waitForTransitionNames);
+    }
+
+    @Override
+    public void restoreFromBundle(@NonNull Bundle bundle) {
+        List<String> savedNames = bundle.getStringArrayList(KEY_WAIT_FOR_TRANSITION_NAMES);
+        if (savedNames != null) {
+            waitForTransitionNames.addAll(savedNames);
+        }
+    }
+
+    @Override
+    public void onAbortPush(@NonNull ControllerChangeHandler newHandler, @Nullable Controller newTop) {
+        super.onAbortPush(newHandler, newTop);
+
+        removedViews.clear();
+    }
+
+    @Nullable
+    View getViewWithTransitionName(@NonNull View view, @NonNull String transitionName) {
+        if (transitionName.equals(view.getTransitionName())) {
+            return view;
+        }
+
+        if (view instanceof ViewGroup) {
+            ViewGroup viewGroup = (ViewGroup)view;
+            int childCount = viewGroup.getChildCount();
+
+            for (int i = 0; i < childCount; i++) {
+                View viewWithTransitionName = getViewWithTransitionName(viewGroup.getChildAt(i), transitionName);
+                if (viewWithTransitionName != null) {
+                    return viewWithTransitionName;
+                }
+            }
+        }
+
+        return null;
+    }
+
+    private static class ViewParentPair {
+        View view;
+        ViewGroup parent;
+
+        public ViewParentPair(View view, ViewGroup parent) {
+            this.view = view;
+            this.parent = parent;
+        }
+    }
+
+}

demo/src/main/java/com/bluelinelabs/conductor/demo/changehandler/transitions/FabTransform.java

@@ -0,0 +1,295 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Example from https://github.com/nickbutcher/plaid
+ */
+package com.bluelinelabs.conductor.demo.changehandler.transitions;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.AnimatorSet;
+import android.animation.ObjectAnimator;
+import android.annotation.TargetApi;
+import android.graphics.Bitmap;
+import android.graphics.Outline;
+import android.graphics.Rect;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.Drawable;
+import android.os.Build;
+import android.support.annotation.ColorInt;
+import android.support.annotation.DrawableRes;
+import android.support.v4.content.ContextCompat;
+import android.transition.Transition;
+import android.transition.TransitionValues;
+import android.view.View;
+import android.view.ViewAnimationUtils;
+import android.view.ViewGroup;
+import android.view.ViewOutlineProvider;
+import android.view.ViewTreeObserver.OnPreDrawListener;
+import android.view.animation.Interpolator;
+
+import com.bluelinelabs.conductor.demo.util.AnimUtils;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static android.view.View.MeasureSpec.makeMeasureSpec;
+
+/**
+ * A transition between a FAB & another surface using a circular reveal moving along an arc.
+ * <p>
+ * See: https://www.google.com/design/spec/motion/transforming-material.html#transforming-material-radial-transformation
+ */
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
+public class FabTransform extends Transition {
+
+    private static final long DEFAULT_DURATION = 240L;
+    private static final String PROP_BOUNDS = "plaid:fabTransform:bounds";
+    private static final String[] TRANSITION_PROPERTIES = {
+            PROP_BOUNDS
+    };
+
+    private final int color;
+    private final int icon;
+
+    public FabTransform(@ColorInt int fabColor, @DrawableRes int fabIconResId) {
+        color = fabColor;
+        icon = fabIconResId;
+        setPathMotion(new GravityArcMotion());
+        setDuration(DEFAULT_DURATION);
+    }
+
+    @Override
+    public String[] getTransitionProperties() {
+        return TRANSITION_PROPERTIES;
+    }
+
+    @Override
+    public void captureStartValues(TransitionValues transitionValues) {
+        captureValues(transitionValues);
+    }
+
+    @Override
+    public void captureEndValues(TransitionValues transitionValues) {
+        captureValues(transitionValues);
+    }
+
+    @Override
+    public Animator createAnimator(final ViewGroup sceneRoot,
+                                   final TransitionValues startValues,
+                                   final TransitionValues endValues) {
+        if (startValues == null || endValues == null)  return null;
+
+        final Rect startBounds = (Rect) startValues.values.get(PROP_BOUNDS);
+        final Rect endBounds = (Rect) endValues.values.get(PROP_BOUNDS);
+
+        final boolean fromFab = endBounds.width() > startBounds.width();
+        final View view = endValues.view;
+        final Rect dialogBounds = fromFab ? endBounds : startBounds;
+        final Interpolator fastOutSlowInInterpolator =
+                AnimUtils.getFastOutSlowInInterpolator();
+        final long duration = getDuration();
+        final long halfDuration = duration / 2;
+        final long twoThirdsDuration = duration * 2 / 3;
+
+        if (!fromFab) {
+            // Force measure / layout the dialog back to it's original bounds
+            view.measure(
+                    makeMeasureSpec(startBounds.width(), View.MeasureSpec.EXACTLY),
+                    makeMeasureSpec(startBounds.height(), View.MeasureSpec.EXACTLY));
+            view.layout(startBounds.left, startBounds.top, startBounds.right, startBounds.bottom);
+        }
+
+        final int translationX = startBounds.centerX() - endBounds.centerX();
+        final int translationY = startBounds.centerY() - endBounds.centerY();
+        if (fromFab) {
+            view.setTranslationX(translationX);
+            view.setTranslationY(translationY);
+        }
+
+        // Add a color overlay to fake appearance of the FAB
+        final ColorDrawable fabColor = new ColorDrawable(color);
+        fabColor.setBounds(0, 0, dialogBounds.width(), dialogBounds.height());
+        if (!fromFab) fabColor.setAlpha(0);
+        view.getOverlay().add(fabColor);
+
+        // Add an icon overlay again to fake the appearance of the FAB
+        final Drawable fabIcon =
+                ContextCompat.getDrawable(sceneRoot.getContext(), icon).mutate();
+        final int iconLeft = (dialogBounds.width() - fabIcon.getIntrinsicWidth()) / 2;
+        final int iconTop = (dialogBounds.height() - fabIcon.getIntrinsicHeight()) / 2;
+        fabIcon.setBounds(iconLeft, iconTop,
+                iconLeft + fabIcon.getIntrinsicWidth(),
+                iconTop + fabIcon.getIntrinsicHeight());
+        if (!fromFab) fabIcon.setAlpha(0);
+        view.getOverlay().add(fabIcon);
+
+        // Since the view that's being transition to always seems to be on the top (z-order), we have
+        // to make a copy of the "from" view and put it in the "to" view's overlay, then fade it out.
+        // There has to be another way to do this, right?
+        Drawable dialogView = null;
+        if (!fromFab) {
+            startValues.view.setDrawingCacheEnabled(true);
+            startValues.view.buildDrawingCache();
+            Bitmap viewBitmap = startValues.view.getDrawingCache();
+            dialogView = new BitmapDrawable(view.getResources(), viewBitmap);
+            dialogView.setBounds(0, 0, dialogBounds.width(), dialogBounds.height());
+            view.getOverlay().add(dialogView);
+        }
+
+        // Circular clip from/to the FAB size
+        final Animator circularReveal;
+        if (fromFab) {
+            circularReveal = ViewAnimationUtils.createCircularReveal(view,
+                    view.getWidth() / 2,
+                    view.getHeight() / 2,
+                    startBounds.width() / 2,
+                    (float) Math.hypot(endBounds.width() / 2, endBounds.height() / 2));
+            circularReveal.setInterpolator(
+                    AnimUtils.getFastOutLinearInInterpolator());
+        } else {
+            circularReveal = ViewAnimationUtils.createCircularReveal(view,
+                    view.getWidth() / 2,
+                    view.getHeight() / 2,
+                    (float) Math.hypot(startBounds.width() / 2, startBounds.height() / 2),
+                    endBounds.width() / 2);
+            circularReveal.setInterpolator(
+                    AnimUtils.getLinearOutSlowInInterpolator());
+
+            // Persist the end clip i.e. stay at FAB size after the reveal has run
+            circularReveal.addListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationEnd(Animator animation) {
+                    final ViewOutlineProvider fabOutlineProvider = view.getOutlineProvider();
+
+                    view.setOutlineProvider(new ViewOutlineProvider() {
+                        boolean hasRun = false;
+
+                        @Override
+                        public void getOutline(final View view, Outline outline) {
+                            final int left = (view.getWidth() - endBounds.width()) / 2;
+                            final int top = (view.getHeight() - endBounds.height()) / 2;
+
+                            outline.setOval(
+                                    left, top, left + endBounds.width(), top + endBounds.height());
+
+                            if (!hasRun) {
+                                hasRun = true;
+                                view.setClipToOutline(true);
+
+                                // We have to remove this as soon as it's laid out so we can get the shadow back
+                                view.getViewTreeObserver().addOnPreDrawListener(new OnPreDrawListener() {
+                                    @Override
+                                    public boolean onPreDraw() {
+                                        if (view.getWidth() == endBounds.width() && view.getHeight() == endBounds.height()) {
+                                            view.setOutlineProvider(fabOutlineProvider);
+                                            view.setClipToOutline(false);
+                                            view.getViewTreeObserver().removeOnPreDrawListener(this);
+                                            return true;
+                                        }
+
+                                        return true;
+                                    }
+                                });
+                            }
+                        }
+                    });
+                }
+            });
+        }
+        circularReveal.setDuration(duration);
+
+        // Translate to end position along an arc
+        final Animator translate = ObjectAnimator.ofFloat(
+                view,
+                View.TRANSLATION_X,
+                View.TRANSLATION_Y,
+                fromFab ? getPathMotion().getPath(translationX, translationY, 0, 0)
+                        : getPathMotion().getPath(0, 0, -translationX, -translationY));
+        translate.setDuration(duration);
+        translate.setInterpolator(fastOutSlowInInterpolator);
+
+        // Fade contents of non-FAB view in/out
+        List<Animator> fadeContents = null;
+        if (view instanceof ViewGroup) {
+            final ViewGroup vg = ((ViewGroup) view);
+            fadeContents = new ArrayList<>(vg.getChildCount());
+            for (int i = vg.getChildCount() - 1; i >= 0; i--) {
+                final View child = vg.getChildAt(i);
+                final Animator fade =
+                        ObjectAnimator.ofFloat(child, View.ALPHA, fromFab ? 1f : 0f);
+                if (fromFab) {
+                    child.setAlpha(0f);
+                }
+                fade.setDuration(twoThirdsDuration);
+                fade.setInterpolator(fastOutSlowInInterpolator);
+                fadeContents.add(fade);
+            }
+        }
+
+        // Fade in/out the fab color & icon overlays
+        final Animator colorFade = ObjectAnimator.ofInt(fabColor, "alpha", fromFab ? 0 : 255);
+        final Animator iconFade = ObjectAnimator.ofInt(fabIcon, "alpha", fromFab ? 0 : 255);
+        if (!fromFab) {
+            colorFade.setStartDelay(halfDuration);
+            iconFade.setStartDelay(halfDuration);
+        }
+        colorFade.setDuration(halfDuration);
+        iconFade.setDuration(halfDuration);
+        colorFade.setInterpolator(fastOutSlowInInterpolator);
+        iconFade.setInterpolator(fastOutSlowInInterpolator);
+
+        // Run all animations together
+        final AnimatorSet transition = new AnimatorSet();
+        transition.playTogether(circularReveal, translate, colorFade, iconFade);
+        transition.playTogether(fadeContents);
+        if (dialogView != null) {
+            final Animator dialogViewFade = ObjectAnimator.ofInt(dialogView, "alpha", 0).setDuration(twoThirdsDuration);
+            dialogViewFade.setInterpolator(fastOutSlowInInterpolator);
+            transition.playTogether(dialogViewFade);
+        }
+        transition.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                // Clean up
+                view.getOverlay().clear();
+
+                if (!fromFab) {
+                    view.setTranslationX(0);
+                    view.setTranslationY(0);
+                    view.setTranslationZ(0);
+
+                    view.measure(
+                            makeMeasureSpec(endBounds.width(), View.MeasureSpec.EXACTLY),
+                            makeMeasureSpec(endBounds.height(), View.MeasureSpec.EXACTLY));
+                    view.layout(endBounds.left, endBounds.top, endBounds.right, endBounds.bottom);
+                }
+
+            }
+        });
+        return new AnimUtils.NoPauseAnimator(transition);
+    }
+
+    private void captureValues(TransitionValues transitionValues) {
+        final View view = transitionValues.view;
+        if (view == null || view.getWidth() <= 0 || view.getHeight() <= 0) return;
+
+        transitionValues.values.put(PROP_BOUNDS, new Rect(view.getLeft(), view.getTop(),
+                view.getRight(), view.getBottom()));
+    }
+}

demo/src/main/java/com/bluelinelabs/conductor/demo/changehandler/transitions/GravityArcMotion.java

@@ -0,0 +1,217 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.bluelinelabs.conductor.demo.changehandler.transitions;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.graphics.Path;
+import android.os.Build;
+import android.transition.ArcMotion;
+import android.util.AttributeSet;
+
+/**
+ * A tweak to {@link ArcMotion} which slightly alters the path calculation. In the real world
+ * gravity slows upward motion and accelerates downward motion. This class emulates this behavior
+ * to make motion paths appear more natural.
+ * <p>
+ * See https://www.google.com/design/spec/motion/movement.html#movement-movement-within-screen-bounds
+ */
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
+public class GravityArcMotion extends ArcMotion {
+
+    private static final float DEFAULT_MIN_ANGLE_DEGREES = 0;
+    private static final float DEFAULT_MAX_ANGLE_DEGREES = 70;
+    private static final float DEFAULT_MAX_TANGENT = (float)
+            Math.tan(Math.toRadians(DEFAULT_MAX_ANGLE_DEGREES/2));
+
+    private float mMinimumHorizontalAngle = 0;
+    private float mMinimumVerticalAngle = 0;
+    private float mMaximumAngle = DEFAULT_MAX_ANGLE_DEGREES;
+    private float mMinimumHorizontalTangent = 0;
+    private float mMinimumVerticalTangent = 0;
+    private float mMaximumTangent = DEFAULT_MAX_TANGENT;
+
+    public GravityArcMotion() {}
+
+    public GravityArcMotion(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    @Override
+    public void setMinimumHorizontalAngle(float angleInDegrees) {
+        mMinimumHorizontalAngle = angleInDegrees;
+        mMinimumHorizontalTangent = toTangent(angleInDegrees);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    @Override
+    public float getMinimumHorizontalAngle() {
+        return mMinimumHorizontalAngle;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    @Override
+    public void setMinimumVerticalAngle(float angleInDegrees) {
+        mMinimumVerticalAngle = angleInDegrees;
+        mMinimumVerticalTangent = toTangent(angleInDegrees);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    @Override
+    public float getMinimumVerticalAngle() {
+        return mMinimumVerticalAngle;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    @Override
+    public void setMaximumAngle(float angleInDegrees) {
+        mMaximumAngle = angleInDegrees;
+        mMaximumTangent = toTangent(angleInDegrees);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    @Override
+    public float getMaximumAngle() {
+        return mMaximumAngle;
+    }
+
+    private static float toTangent(float arcInDegrees) {
+        if (arcInDegrees < 0 || arcInDegrees > 90) {
+            throw new IllegalArgumentException("Arc must be between 0 and 90 degrees");
+        }
+        return (float) Math.tan(Math.toRadians(arcInDegrees / 2));
+    }
+
+    @Override
+    public Path getPath(float startX, float startY, float endX, float endY) {
+        // Here's a little ascii art to show how this is calculated:
+        // c---------- b
+        //  \        / |
+        //    \     d  |
+        //      \  /   e
+        //        a----f
+        // This diagram assumes that the horizontal distance is less than the vertical
+        // distance between The start point (a) and end point (b).
+        // d is the midpoint between a and b. c is the center point of the circle with
+        // This path is formed by assuming that start and end points are in
+        // an arc on a circle. The end point is centered in the circle vertically
+        // and start is a point on the circle.
+
+        // Triangles bfa and bde form similar right triangles. The control points
+        // for the cubic Bezier arc path are the midpoints between a and e and e and b.
+
+        Path path = new Path();
+        path.moveTo(startX, startY);
+
+        float ex;
+        float ey;
+        if (startY == endY) {
+            ex = (startX + endX) / 2;
+            ey = startY + mMinimumHorizontalTangent * Math.abs(endX - startX) / 2;
+        } else if (startX == endX) {
+            ex = startX + mMinimumVerticalTangent * Math.abs(endY - startY) / 2;
+            ey = (startY + endY) / 2;
+        } else {
+            float deltaX = endX - startX;
+
+            /**
+             * This is the only change to ArcMotion
+             */
+            float deltaY;
+            if (endY < startY) {
+                deltaY = startY - endY; // Y is inverted compared to diagram above.
+            } else {
+                deltaY = endY - startY;
+            }
+            /**
+             * End changes
+             */
+
+            // hypotenuse squared.
+            float h2 = deltaX * deltaX + deltaY * deltaY;
+
+            // Midpoint between start and end
+            float dx = (startX + endX) / 2;
+            float dy = (startY + endY) / 2;
+
+            // Distance squared between end point and mid point is (1/2 hypotenuse)^2
+            float midDist2 = h2 * 0.25f;
+
+            float minimumArcDist2 = 0;
+
+            if (Math.abs(deltaX) < Math.abs(deltaY)) {
+                // Similar triangles bfa and bde mean that (ab/fb = eb/bd)
+                // Therefore, eb = ab * bd / fb
+                // ab = hypotenuse
+                // bd = hypotenuse/2
+                // fb = deltaY
+                float eDistY = h2 / (2 * deltaY);
+                ey = endY + eDistY;
+                ex = endX;
+
+                minimumArcDist2 = midDist2 * mMinimumVerticalTangent
+                        * mMinimumVerticalTangent;
+            } else {
+                // Same as above, but flip X & Y
+                float eDistX = h2 / (2 * deltaX);
+                ex = endX + eDistX;
+                ey = endY;
+
+                minimumArcDist2 = midDist2 * mMinimumHorizontalTangent
+                        * mMinimumHorizontalTangent;
+            }
+            float arcDistX = dx - ex;
+            float arcDistY = dy - ey;
+            float arcDist2 = arcDistX * arcDistX + arcDistY * arcDistY;
+
+            float maximumArcDist2 = midDist2 * mMaximumTangent * mMaximumTangent;
+
+            float newArcDistance2 = 0;
+            if (arcDist2 < minimumArcDist2) {
+                newArcDistance2 = minimumArcDist2;
+            } else if (arcDist2 > maximumArcDist2) {
+                newArcDistance2 = maximumArcDist2;
+            }
+            if (newArcDistance2 != 0) {
+                float ratio2 = newArcDistance2 / arcDist2;
+                float ratio = (float) Math.sqrt(ratio2);
+                ex = dx + (ratio * (ex - dx));
+                ey = dy + (ratio * (ey - dy));
+            }
+        }
+        float controlX1 = (startX + ex) / 2;
+        float controlY1 = (startY + ey) / 2;
+        float controlX2 = (ex + endX) / 2;
+        float controlY2 = (ey + endY) / 2;
+        path.cubicTo(controlX1, controlY1, controlX2, controlY2, endX, endY);
+        return path;
+    }
+
+}

demo/src/main/java/com/bluelinelabs/conductor/demo/controllers/CityDetailController.java

@@ -0,0 +1,169 @@
+package com.bluelinelabs.conductor.demo.controllers;
+
+import android.os.Build;
+import android.os.Bundle;
+import android.support.annotation.DrawableRes;
+import android.support.annotation.NonNull;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import com.bluelinelabs.conductor.demo.R;
+import com.bluelinelabs.conductor.demo.controllers.base.BaseController;
+import com.bluelinelabs.conductor.demo.util.BundleBuilder;
+
+import butterknife.BindView;
+import butterknife.ButterKnife;
+
+public class CityDetailController extends BaseController {
+
+    private static final String KEY_TITLE = "CityDetailController.title";
+    private static final String KEY_IMAGE = "CityDetailController.image";
+
+    private static final String[] LIST_ROWS = new String[] {
+            "• This is a city.",
+            "• There's some cool stuff about it.",
+            "• But really this is just a demo, not a city guide app.",
+            "• This demo is meant to show some nice transitions, as long as you're on Lollipop or later.",
+            "• You should have seen some sweet shared element transitions using the ImageView and the TextView in the \"header\" above.",
+            "• This transition utilized some callbacks to ensure all the necessary rows in the RecyclerView were laid about before the transition occurred.",
+            "• Just adding some more lines so it scrolls now...\n\n\n\n\n\n\nThe end."
+    };
+
+    @BindView(R.id.recycler_view) RecyclerView recyclerView;
+
+    @DrawableRes private int imageDrawableRes;
+    private String title;
+
+    public CityDetailController(@DrawableRes int imageDrawableRes, String title) {
+        this(new BundleBuilder(new Bundle())
+                .putInt(KEY_IMAGE, imageDrawableRes)
+                .putString(KEY_TITLE, title)
+                .build());
+    }
+
+    public CityDetailController(Bundle args) {
+        super(args);
+        imageDrawableRes = getArgs().getInt(KEY_IMAGE);
+        title = getArgs().getString(KEY_TITLE);
+    }
+
+    @NonNull
+    @Override
+    protected View inflateView(@NonNull LayoutInflater inflater, @NonNull ViewGroup container) {
+        return inflater.inflate(R.layout.controller_city_detail, container, false);
+    }
+
+    @Override
+    protected void onViewBound(@NonNull View view) {
+        super.onViewBound(view);
+
+        recyclerView.setHasFixedSize(true);
+        recyclerView.setLayoutManager(new LinearLayoutManager(view.getContext()));
+        recyclerView.setAdapter(new CityDetailAdapter(LayoutInflater.from(view.getContext()), title, imageDrawableRes, LIST_ROWS, title));
+    }
+
+    @Override
+    protected String getTitle() {
+        return title;
+    }
+
+    static class CityDetailAdapter extends RecyclerView.Adapter<CityDetailAdapter.ViewHolder> {
+
+        private static final int VIEW_TYPE_HEADER = 0;
+        private static final int VIEW_TYPE_DETAIL = 1;
+
+        private final LayoutInflater inflater;
+        private final String title;
+        @DrawableRes private final int imageDrawableRes;
+        private final String imageViewTransitionName;
+        private final String textViewTransitionName;
+        private final String[] details;
+
+        public CityDetailAdapter(LayoutInflater inflater, @DrawableRes String title, int imageDrawableRes, String[] details, String transitionNameBase) {
+            this.inflater = inflater;
+            this.title = title;
+            this.imageDrawableRes = imageDrawableRes;
+            this.details = details;
+            imageViewTransitionName = inflater.getContext().getResources().getString(R.string.transition_tag_image_named, transitionNameBase);
+            textViewTransitionName = inflater.getContext().getResources().getString(R.string.transition_tag_title_named, transitionNameBase);
+        }
+
+        @Override
+        public int getItemViewType(int position) {
+            if (position == 0) {
+                return VIEW_TYPE_HEADER;
+            } else {
+                return VIEW_TYPE_DETAIL;
+            }
+        }
+
+        @Override
+        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+            if (viewType == VIEW_TYPE_HEADER) {
+                return new HeaderViewHolder(inflater.inflate(R.layout.row_city_header, parent, false));
+            } else {
+                return new DetailViewHolder(inflater.inflate(R.layout.row_city_detail, parent, false));
+            }
+        }
+
+        @Override
+        public void onBindViewHolder(ViewHolder holder, int position) {
+            if (getItemViewType(position) == VIEW_TYPE_HEADER) {
+                ((HeaderViewHolder)holder).bind(imageDrawableRes, title, imageViewTransitionName, textViewTransitionName);
+            } else {
+                ((DetailViewHolder)holder).bind(details[position - 1]);
+            }
+        }
+
+        @Override
+        public int getItemCount() {
+            return 1 + details.length;
+        }
+
+        static class ViewHolder extends RecyclerView.ViewHolder {
+            ViewHolder(View itemView) {
+                super(itemView);
+                ButterKnife.bind(this, itemView);
+            }
+        }
+
+        static class HeaderViewHolder extends ViewHolder {
+
+            @BindView(R.id.image_view) ImageView imageView;
+            @BindView(R.id.text_view) TextView textView;
+
+            public HeaderViewHolder(View itemView) {
+                super(itemView);
+            }
+
+            void bind(@DrawableRes int imageDrawableRes, String title, String imageTransitionName, String textViewTransitionName) {
+                imageView.setImageResource(imageDrawableRes);
+                textView.setText(title);
+
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+                    imageView.setTransitionName(imageTransitionName);
+                    textView.setTransitionName(textViewTransitionName);
+                }
+            }
+        }
+
+        static class DetailViewHolder extends ViewHolder {
+
+            @BindView(R.id.text_view) TextView textView;
+
+            public DetailViewHolder(View itemView) {
+                super(itemView);
+            }
+
+            void bind(String detail) {
+                textView.setText(detail);
+            }
+
+        }
+    }
+}

demo/src/main/java/com/bluelinelabs/conductor/demo/controllers/CityGridController.java

@@ -0,0 +1,174 @@
+package com.bluelinelabs.conductor.demo.controllers;
+
+import android.graphics.PorterDuff.Mode;
+import android.os.Build;
+import android.os.Bundle;
+import android.support.annotation.DrawableRes;
+import android.support.annotation.NonNull;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.widget.GridLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import com.bluelinelabs.conductor.RouterTransaction;
+import com.bluelinelabs.conductor.changehandler.FadeChangeHandler;
+import com.bluelinelabs.conductor.changehandler.TransitionChangeHandlerCompat;
+import com.bluelinelabs.conductor.demo.R;
+import com.bluelinelabs.conductor.demo.changehandler.SharedElementDelayingChangeHandler;
+import com.bluelinelabs.conductor.demo.controllers.base.BaseController;
+import com.bluelinelabs.conductor.demo.util.BundleBuilder;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import butterknife.BindView;
+import butterknife.ButterKnife;
+import butterknife.OnClick;
+
+public class CityGridController extends BaseController {
+
+    private static final String KEY_TITLE = "CityGridController.title";
+    private static final String KEY_DOT_COLOR = "CityGridController.dotColor";
+    private static final String KEY_FROM_POSITION = "CityGridController.position";
+
+    private static final CityModel[] CITY_MODELS = new CityModel[] {
+            new CityModel(R.drawable.chicago, "Chicago"),
+            new CityModel(R.drawable.jakarta, "Jakarta"),
+            new CityModel(R.drawable.london, "London"),
+            new CityModel(R.drawable.sao_paulo, "Sao Paulo"),
+            new CityModel(R.drawable.tokyo, "Tokyo")
+    };
+
+    @BindView(R.id.tv_title) TextView tvTitle;
+    @BindView(R.id.img_dot) ImageView imgDot;
+    @BindView(R.id.recycler_view) RecyclerView recyclerView;
+
+    private String title;
+    private int dotColor;
+    private int fromPosition;
+
+    public CityGridController(String title, int dotColor, int fromPosition) {
+        this(new BundleBuilder(new Bundle())
+                .putString(KEY_TITLE, title)
+                .putInt(KEY_DOT_COLOR, dotColor)
+                .putInt(KEY_FROM_POSITION, fromPosition)
+                .build());
+    }
+
+    public CityGridController(Bundle args) {
+        super(args);
+        title = getArgs().getString(KEY_TITLE);
+        dotColor = getArgs().getInt(KEY_DOT_COLOR);
+        fromPosition = getArgs().getInt(KEY_FROM_POSITION);
+    }
+
+    @NonNull
+    @Override
+    protected View inflateView(@NonNull LayoutInflater inflater, @NonNull ViewGroup container) {
+        return inflater.inflate(R.layout.controller_city_grid, container, false);
+    }
+
+    @Override
+    protected void onViewBound(@NonNull View view) {
+        super.onViewBound(view);
+
+        tvTitle.setText(title);
+        imgDot.getDrawable().setColorFilter(ContextCompat.getColor(getActivity(), dotColor), Mode.SRC_ATOP);
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+            tvTitle.setTransitionName(getResources().getString(R.string.transition_tag_title_indexed, fromPosition));
+            imgDot.setTransitionName(getResources().getString(R.string.transition_tag_dot_indexed, fromPosition));
+        }
+
+        recyclerView.setHasFixedSize(true);
+        recyclerView.setLayoutManager(new GridLayoutManager(view.getContext(), 2));
+        recyclerView.setAdapter(new CityGridAdapter(LayoutInflater.from(view.getContext()), CITY_MODELS));
+    }
+
+    @Override
+    protected String getTitle() {
+        return "Shared Element Demos";
+    }
+
+    void onModelRowClick(CityModel model) {
+        String imageTransitionName = getResources().getString(R.string.transition_tag_image_named, model.title);
+        String titleTransitionName = getResources().getString(R.string.transition_tag_title_named, model.title);
+
+        List<String> names = new ArrayList<>();
+        names.add(imageTransitionName);
+        names.add(titleTransitionName);
+
+        getRouter().pushController(RouterTransaction.with(new CityDetailController(model.drawableRes, model.title))
+                .pushChangeHandler(new TransitionChangeHandlerCompat(new SharedElementDelayingChangeHandler(names), new FadeChangeHandler()))
+                .popChangeHandler(new TransitionChangeHandlerCompat(new SharedElementDelayingChangeHandler(names), new FadeChangeHandler())));
+    }
+
+    class CityGridAdapter extends RecyclerView.Adapter<CityGridAdapter.ViewHolder> {
+
+        private final LayoutInflater inflater;
+        private final CityModel[] items;
+
+        public CityGridAdapter(LayoutInflater inflater, CityModel[] items) {
+            this.inflater = inflater;
+            this.items = items;
+        }
+
+        @Override
+        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+            return new ViewHolder(inflater.inflate(R.layout.row_city_grid, parent, false));
+        }
+
+        @Override
+        public void onBindViewHolder(ViewHolder holder, int position) {
+            holder.bind(items[position]);
+        }
+
+        @Override
+        public int getItemCount() {
+            return items.length;
+        }
+
+        class ViewHolder extends RecyclerView.ViewHolder {
+
+            @BindView(R.id.tv_title) TextView textView;
+            @BindView(R.id.img_city) ImageView imageView;
+            private CityModel model;
+
+            public ViewHolder(View itemView) {
+                super(itemView);
+                ButterKnife.bind(this, itemView);
+            }
+
+            void bind(CityModel item) {
+                model = item;
+                imageView.setImageResource(item.drawableRes);
+                textView.setText(item.title);
+
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+                    textView.setTransitionName(getResources().getString(R.string.transition_tag_title_named, model.title));
+                    imageView.setTransitionName(getResources().getString(R.string.transition_tag_image_named, model.title));
+                }
+            }
+
+            @OnClick(R.id.row_root)
+            void onRowClick() {
+                onModelRowClick(model);
+            }
+
+        }
+    }
+
+    private static class CityModel {
+        @DrawableRes int drawableRes;
+        String title;
+
+        public CityModel(@DrawableRes int drawableRes, String title) {
+            this.drawableRes = drawableRes;
+            this.title = title;
+        }
+    }
+}

demo/src/main/java/com/bluelinelabs/conductor/demo/controllers/DialogController.java

@@ -0,0 +1,60 @@
+package com.bluelinelabs.conductor.demo.controllers;
+
+
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.text.method.LinkMovementMethod;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import com.bluelinelabs.conductor.demo.R;
+import com.bluelinelabs.conductor.demo.controllers.base.BaseController;
+import com.bluelinelabs.conductor.demo.util.BundleBuilder;
+
+import butterknife.BindView;
+import butterknife.OnClick;
+
+public class DialogController extends BaseController {
+
+    private static final String KEY_TITLE = "DialogController.title";
+    private static final String KEY_DESCRIPTION = "DialogController.description";
+
+    @BindView(R.id.tv_title) TextView tvTitle;
+    @BindView(R.id.tv_description) TextView tvDescription;
+
+    public DialogController(CharSequence title, CharSequence description) {
+        this(new BundleBuilder(new Bundle())
+                .putCharSequence(KEY_TITLE, title)
+                .putCharSequence(KEY_DESCRIPTION, description)
+                .build());
+    }
+
+    public DialogController(Bundle args) {
+        super(args);
+    }
+
+    @Override
+    protected View inflateView(@NonNull LayoutInflater inflater, @NonNull ViewGroup container) {
+        return inflater.inflate(R.layout.controller_dialog, container, false);
+    }
+
+    @Override
+    public void onViewBound(@NonNull View view) {
+        super.onViewBound(view);
+        tvTitle.setText(getArgs().getCharSequence(KEY_TITLE));
+        tvDescription.setText(getArgs().getCharSequence(KEY_DESCRIPTION));
+        tvDescription.setMovementMethod(LinkMovementMethod.getInstance());
+    }
+
+    @OnClick({R.id.dismiss, R.id.dialog_window})
+    public void dismissDialog() {
+        getRouter().popController(this);
+    }
+
+    @Override
+    public boolean handleBack() {
+        return super.handleBack();
+    }
+}

demo/src/main/java/com/bluelinelabs/conductor/demo/controllers/DragDismissController.java

@@ -6,7 +6,6 @@ import android.support.annotation.NonNull;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.TextView;
 
 import com.bluelinelabs.conductor.demo.R;
 import com.bluelinelabs.conductor.demo.changehandler.ScaleFadeChangeHandler;
@@ -14,13 +13,9 @@ import com.bluelinelabs.conductor.demo.controllers.base.BaseController;
 import com.bluelinelabs.conductor.demo.widget.ElasticDragDismissFrameLayout;
 import com.bluelinelabs.conductor.demo.widget.ElasticDragDismissFrameLayout.ElasticDragDismissCallback;
 
-import butterknife.BindView;
-
 @TargetApi(VERSION_CODES.LOLLIPOP)
 public class DragDismissController extends BaseController {
 
-    @BindView(R.id.tv_lorem_ipsum) TextView tvLoremIpsum;
-
     private final ElasticDragDismissCallback dragDismissListener = new ElasticDragDismissCallback() {
         @Override
         public void onDragDismissed() {
@@ -38,11 +33,6 @@ public class DragDismissController extends BaseController {
     @Override
     protected void onViewBound(@NonNull View view) {
         ((ElasticDragDismissFrameLayout)view).addListener(dragDismissListener);
-
-        tvLoremIpsum.setText("Lorem ipsum dolor sit amet, volutpat lacus egestas integer vitae, tempus potenti posuere dolore, elit cras ut vulputate pede eros. Pharetra curabitur, cum ultrices nisi nulla, non a est diamlorem in pede. Feugiat vivamus id, leo massa, pede ligula libero wisi, posuere nec interdum risus. Mauris eros. Scelerisque etiam dignissim, sem odio magna posuere libero in. Eget non posuere, rutrum nunc ut, ipsum ornare, vestibulum nisl turpis, urna interdum. Arcu mi velit. Sem dolor amet sed hymenaeos tempor. Cras felis.\n" +
-                "Tempus risus vehicula, mauris nulla interdum purus sodales suspendisse, morbi ultrices tempus vitae vestibulum porttitor, vel mus enim tellus non massa in, quis nec fermentum scelerisque sem congue dolores. Accumsan lacinia urna eu feugiat, habitasse wisi cras id nonummy sapien, a pede. Turpis ac donec, adipiscing ut faucibus, odio ut morbi, habitant volutpat lacinia. At vitae ipsum, porttitor wisi hendrerit pellentesque sapien, suspendisse pellentesque praesent sit tellus varius. At in ligula neque imperdiet eget, viverra lectus risus est sem feugiat. Diam amet non phasellus, sed enim ante etiam lorem id at, feugiat eu urna, urna posuere. Amet vel, vehicula ac in fermentum id, elit mauris dolor, eget orci in nec non in vestibulum. Tortor risus mattis, massa vel condimentum non ornare, pede nunc curabitur dui, eu dolorum luctus duis pellentesque. Nec in imperdiet ac tortor pulvinar bibendum. Parturient lacus luctus posuere, quis luctus sociis tellus iaculis.\n" +
-                "Eu nec, nulla ut neque ac suspendisse, ac purus mattis pretium orci orci, penatibus sollicitudin pellentesque massa, felis et molestie natoque justo vitae. Laoreet nunc nulla augue semper, nulla ridiculus elit in quis bibendum ultrices, integer duis. Dolor ut donec ligula vehicula odio, in lacinia mattis ut quos, semper libero nulla, et euismod ut, nec curabitur turpis aliquet mauris sit a. Tellus interdum dignissim felis. Ultrices dignissim ut, enim urna adipiscing, nunc accumsan justo odio fringilla magna penatibus. Amet integer metus sollicitudin tristique libero dolor, augue nulla pellentesque, massa in suspendisse, adipiscing donec neque nunc. Malesuada non, luctus vestibulum, et at taciti orci felis. Aliquam dolor nibh erat in tincidunt in, risus suscipit integer, quis dolor quis quam. Ultrices dictum, dignissim interdum aenean pede ornare pretium, vehicula adipiscing enim nec magna mollis duis. Imperdiet dolor velit phasellus, laoreet sed ridiculus sollicitudin sit viverra metus, integer sit nunc fusce nonummy augue. Maecenas adipiscing porttitor eu risus nunc malesuada, quo vitae blandit amet feugiat nunc. Pede hac duis in.\n" +
-                "Lorem posuere ridiculus donec, volutpat vehicula erat nunc ut, justo occaecati vivamus aliquam massa, felis etiam, sed feugiat molestie eu. Et leo non dignissim nam. Fringilla pretium suspendisse vitae nascetur massa hymenaeos, lectus ut senectus amet, a enim. Pellentesque integer erat, mauris morbi pellentesque, sodales phasellus turpis purus nulla porta, massa vulputate consectetuer habitasse malesuada pulvinar, vehicula in elit eros interdum ut. Et enim vulputate, aliquam donec ullamcorper et, vel consequat tincidunt. Ipsum quam sed ante quis at, ultrices eget. Rutrum qui et velit possimus in, odio amet ut adipiscing sed nec, a tellus ut, quam molestie. Nisl adipiscing euismod nec, eget facilisis ac sit. Suspendisse elit amet consequat dolor senectus vivamus, at scelerisque erat, odio doloribus velit et felis neque, turpis adipiscing, arcu varius placerat leo.");
     }
 
     @Override

demo/src/main/java/com/bluelinelabs/conductor/demo/controllers/HomeController.java

@@ -3,6 +3,8 @@ package com.bluelinelabs.conductor.demo.controllers;
 import android.content.Intent;
 import android.graphics.PorterDuff.Mode;
 import android.net.Uri;
+import android.os.Build;
+import android.os.Bundle;
 import android.support.annotation.ColorRes;
 import android.support.annotation.NonNull;
 import android.support.v4.content.ContextCompat;
@@ -26,7 +28,10 @@ import com.bluelinelabs.conductor.ControllerChangeHandler;
 import com.bluelinelabs.conductor.ControllerChangeType;
 import com.bluelinelabs.conductor.RouterTransaction;
 import com.bluelinelabs.conductor.changehandler.FadeChangeHandler;
+import com.bluelinelabs.conductor.changehandler.TransitionChangeHandlerCompat;
 import com.bluelinelabs.conductor.demo.R;
+import com.bluelinelabs.conductor.demo.changehandler.ArcFadeMoveChangeHandler;
+import com.bluelinelabs.conductor.demo.changehandler.FabToDialogTransitionChangeHandler;
 import com.bluelinelabs.conductor.demo.controllers.NavigationDemoController.DisplayUpMode;
 import com.bluelinelabs.conductor.demo.controllers.base.BaseController;
 
@@ -36,9 +41,10 @@ import butterknife.OnClick;
 
 public class HomeController extends BaseController {
 
-    public enum HomeDemoModel {
+    private enum HomeDemoModel {
         NAVIGATION("Navigation Demos", R.color.red_300),
         TRANSITIONS("Transition Demos", R.color.blue_grey_300),
+        SHARED_ELEMENT_TRANSITIONS("Shared Element Demos", R.color.purple_300),
         CHILD_CONTROLLERS("Child Controllers", R.color.orange_300),
         VIEW_PAGER("ViewPager", R.color.green_300),
         TARGET_CONTROLLER("Target Controller", R.color.pink_300),
@@ -46,8 +52,7 @@ public class HomeController extends BaseController {
         MASTER_DETAIL("Master Detail", R.color.grey_300),
         DRAG_DISMISS("Drag Dismiss", R.color.lime_300),
         RX_LIFECYCLE("Rx Lifecycle", R.color.teal_300),
-        RX_LIFECYCLE_2("Rx Lifecycle 2", R.color.brown_300),
-        OVERLAY("Overlay Controller", R.color.purple_300);
+        RX_LIFECYCLE_2("Rx Lifecycle 2", R.color.brown_300);
 
         String title;
         @ColorRes int color;
@@ -58,8 +63,10 @@ public class HomeController extends BaseController {
         }
     }
 
+    private static final String KEY_FAB_VISIBILITY = "HomeController.fabVisibility";
+
     @BindView(R.id.recycler_view) RecyclerView recyclerView;
-    @BindView(R.id.overlay_root) ViewGroup overlayRoot;
+    @BindView(R.id.fab) View fab;
 
     public HomeController() {
         setHasOptionsMenu(true);
@@ -80,6 +87,20 @@ public class HomeController extends BaseController {
         recyclerView.setAdapter(new HomeAdapter(LayoutInflater.from(view.getContext()), HomeDemoModel.values()));
     }
 
+    @Override
+    protected void onSaveViewState(@NonNull View view, @NonNull Bundle outState) {
+        super.onSaveViewState(view, outState);
+        outState.putInt(KEY_FAB_VISIBILITY, fab.getVisibility());
+    }
+
+    @Override
+    protected void onRestoreViewState(@NonNull View view, @NonNull Bundle savedViewState) {
+        super.onRestoreViewState(view, savedViewState);
+
+        //noinspection WrongConstant
+        fab.setVisibility(savedViewState.getInt(KEY_FAB_VISIBILITY));
+    }
+
     @Override
     public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
         super.onCreateOptionsMenu(menu, inflater);
@@ -98,30 +119,7 @@ public class HomeController extends BaseController {
     @Override
     public boolean onOptionsItemSelected(@NonNull MenuItem item) {
         if (item.getItemId() == R.id.about) {
-            SpannableString details = new SpannableString("A small, yet full-featured framework that allows building View-based Android applications");
-            details.setSpan(new AbsoluteSizeSpan(16, true), 0, details.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
-
-            final String url = "https://github.com/bluelinelabs/Conductor";
-            SpannableString link = new SpannableString(url);
-            link.setSpan(new URLSpan(url) {
-                @Override
-                public void onClick(View widget) {
-                    startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
-                }
-            }, 0, link.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
-
-            SpannableStringBuilder content = new SpannableStringBuilder();
-            content.append("Conductor");
-            content.append("\n\n");
-            content.append(details);
-            content.append("\n\n");
-            content.append(link);
-
-            getChildRouter(overlayRoot)
-                    .setPopsLastView(true)
-                    .setRoot(RouterTransaction.with(new OverlayController(content))
-                            .pushChangeHandler(new FadeChangeHandler())
-                            .popChangeHandler(new FadeChangeHandler()));
+            onFabClicked(false);
             return true;
         }
         return super.onOptionsItemSelected(item);
@@ -132,7 +130,40 @@ public class HomeController extends BaseController {
         return "Conductor Demos";
     }
 
-    void onModelRowClick(HomeDemoModel model) {
+    @OnClick(R.id.fab)
+    public void onFabClicked() {
+        onFabClicked(true);
+    }
+
+    private void onFabClicked(boolean fromFab) {
+        SpannableString details = new SpannableString("A small, yet full-featured framework that allows building View-based Android applications");
+        details.setSpan(new AbsoluteSizeSpan(16, true), 0, details.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
+
+        final String url = "https://github.com/bluelinelabs/Conductor";
+        SpannableString link = new SpannableString(url);
+        link.setSpan(new URLSpan(url) {
+            @Override
+            public void onClick(View widget) {
+                startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
+            }
+        }, 0, link.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
+
+        SpannableStringBuilder description = new SpannableStringBuilder();
+        description.append(details);
+        description.append("\n\n");
+        description.append(link);
+
+        ControllerChangeHandler pushHandler = fromFab ? new TransitionChangeHandlerCompat(new FabToDialogTransitionChangeHandler(), new FadeChangeHandler(false)) : new FadeChangeHandler(false);
+        ControllerChangeHandler popHandler = fromFab ? new TransitionChangeHandlerCompat(new FabToDialogTransitionChangeHandler(), new FadeChangeHandler()) : new FadeChangeHandler();
+
+        getRouter()
+                .pushController(RouterTransaction.with(new DialogController("Conductor", description))
+                        .pushChangeHandler(pushHandler)
+                        .popChangeHandler(popHandler));
+
+    }
+
+    void onModelRowClick(HomeDemoModel model, int position) {
         switch (model) {
             case NAVIGATION:
                 getRouter().pushController(RouterTransaction.with(new NavigationDemoController(0, DisplayUpMode.SHOW_FOR_CHILDREN_ONLY))
@@ -160,12 +191,10 @@ public class HomeController extends BaseController {
                         .pushChangeHandler(new FadeChangeHandler())
                         .popChangeHandler(new FadeChangeHandler()));
                 break;
-            case OVERLAY:
-                getChildRouter(overlayRoot)
-                        .setPopsLastView(true)
-                        .setRoot(RouterTransaction.with(new OverlayController("I'm an overlay!"))
-                                .pushChangeHandler(new FadeChangeHandler())
-                                .popChangeHandler(new FadeChangeHandler()));
+            case SHARED_ELEMENT_TRANSITIONS:
+                getRouter().pushController(RouterTransaction.with(new CityGridController(model.title, model.color, position))
+                        .pushChangeHandler(new TransitionChangeHandlerCompat(new ArcFadeMoveChangeHandler(), new FadeChangeHandler()))
+                        .popChangeHandler(new TransitionChangeHandlerCompat(new ArcFadeMoveChangeHandler(), new FadeChangeHandler())));
                 break;
             case DRAG_DISMISS:
                 getRouter().pushController(RouterTransaction.with(new DragDismissController())
@@ -212,7 +241,7 @@ public class HomeController extends BaseController {
 
         @Override
         public void onBindViewHolder(ViewHolder holder, int position) {
-            holder.bind(items[position]);
+            holder.bind(position, items[position]);
         }
 
         @Override
@@ -225,21 +254,28 @@ public class HomeController extends BaseController {
             @BindView(R.id.tv_title) TextView tvTitle;
             @BindView(R.id.img_dot) ImageView imgDot;
             private HomeDemoModel model;
+            private int position;
 
             public ViewHolder(View itemView) {
                 super(itemView);
                 ButterKnife.bind(this, itemView);
             }
 
-            void bind(HomeDemoModel item) {
+            void bind(int position, HomeDemoModel item) {
                 model = item;
                 tvTitle.setText(item.title);
                 imgDot.getDrawable().setColorFilter(ContextCompat.getColor(getActivity(), item.color), Mode.SRC_ATOP);
+                this.position = position;
+
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+                    tvTitle.setTransitionName(getResources().getString(R.string.transition_tag_title_indexed, position));
+                    imgDot.setTransitionName(getResources().getString(R.string.transition_tag_dot_indexed, position));
+                }
             }
 
             @OnClick(R.id.row_root)
             void onRowClick() {
-                onModelRowClick(model);
+                onModelRowClick(model, position);
             }
 
         }

demo/src/main/java/com/bluelinelabs/conductor/demo/controllers/OverlayController.java

@@ -1,46 +0,0 @@
-package com.bluelinelabs.conductor.demo.controllers;
-
-import android.os.Bundle;
-import android.support.annotation.NonNull;
-import android.text.method.LinkMovementMethod;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-import android.widget.TextView;
-
-import com.bluelinelabs.conductor.demo.R;
-import com.bluelinelabs.conductor.demo.controllers.base.BaseController;
-import com.bluelinelabs.conductor.demo.util.BundleBuilder;
-
-import butterknife.BindView;
-
-public class OverlayController extends BaseController {
-
-    private static final String KEY_TEXT = "OverlayController.text";
-
-    @BindView(R.id.text_view) TextView textView;
-
-    public OverlayController(CharSequence text) {
-        this(new BundleBuilder(new Bundle())
-                .putCharSequence(KEY_TEXT, text)
-                .build());
-    }
-
-    public OverlayController(Bundle args) {
-        super(args);
-    }
-
-    @NonNull
-    @Override
-    protected View inflateView(@NonNull LayoutInflater inflater, @NonNull ViewGroup container) {
-        return inflater.inflate(R.layout.controller_overlay, container, false);
-    }
-
-    @Override
-    public void onViewBound(@NonNull View view) {
-        super.onViewBound(view);
-        textView.setText(getArgs().getCharSequence(KEY_TEXT));
-        textView.setMovementMethod(LinkMovementMethod.getInstance());
-    }
-
-}

demo/src/main/java/com/bluelinelabs/conductor/demo/controllers/PagerController.java

@@ -30,7 +30,7 @@ public class PagerController extends BaseController {
     public PagerController() {
         pagerAdapter = new RouterPagerAdapter(this) {
             @Override
-            public void configureRouter(Router router, int position) {
+            public void configureRouter(@NonNull Router router, int position) {
                 if (!router.hasRootController()) {
                     Controller page = new ChildController(String.format(Locale.getDefault(), "Child #%d (Swipe to see more)", position), PAGE_COLORS[position], true);
                     router.setRoot(RouterTransaction.with(page));
@@ -49,6 +49,12 @@ public class PagerController extends BaseController {
         };
     }
 
+    @NonNull
+    @Override
+    protected View inflateView(@NonNull LayoutInflater inflater, @NonNull ViewGroup container) {
+        return inflater.inflate(R.layout.controller_pager, container, false);
+    }
+
     @Override
     protected void onViewBound(@NonNull View view) {
         super.onViewBound(view);
@@ -58,16 +64,13 @@ public class PagerController extends BaseController {
 
     @Override
     protected void onDestroyView(@NonNull View view) {
-        viewPager.setAdapter(null);
+        if (!getActivity().isChangingConfigurations()) {
+            viewPager.setAdapter(null);
+        }
+        tabLayout.setupWithViewPager(null);
         super.onDestroyView(view);
     }
 
-    @NonNull
-    @Override
-    protected View inflateView(@NonNull LayoutInflater inflater, @NonNull ViewGroup container) {
-        return inflater.inflate(R.layout.controller_pager, container, false);
-    }
-
     @Override
     protected String getTitle() {
         return "ViewPager Demo";

demo/src/main/java/com/bluelinelabs/conductor/demo/controllers/RxLifecycle2Controller.java

@@ -1,6 +1,7 @@
 package com.bluelinelabs.conductor.demo.controllers;
 
 import android.support.annotation.NonNull;
+import android.support.v4.content.ContextCompat;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -61,6 +62,7 @@ public class RxLifecycle2Controller extends RxController {
         Log.i(TAG, "onCreateView() called");
 
         View view = inflater.inflate(R.layout.controller_rxlifecycle, container, false);
+        view.setBackgroundColor(ContextCompat.getColor(container.getContext(), R.color.brown_300));
         unbinder = ButterKnife.bind(this, view);
 
         tvTitle.setText(getResources().getString(R.string.rxlifecycle_title, TAG));

demo/src/main/java/com/bluelinelabs/conductor/demo/controllers/RxLifecycleController.java

@@ -1,6 +1,7 @@
 package com.bluelinelabs.conductor.demo.controllers;
 
 import android.support.annotation.NonNull;
+import android.support.v4.content.ContextCompat;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -61,6 +62,7 @@ public class RxLifecycleController extends RxController {
         Log.i(TAG, "onCreateView() called");
 
         View view = inflater.inflate(R.layout.controller_rxlifecycle, container, false);
+        view.setBackgroundColor(ContextCompat.getColor(container.getContext(), R.color.teal_300));
         unbinder = ButterKnife.bind(this, view);
 
         tvTitle.setText(getResources().getString(R.string.rxlifecycle_title, TAG));

demo/src/main/java/com/bluelinelabs/conductor/demo/util/AnimUtils.java

@@ -0,0 +1,377 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.bluelinelabs.conductor.demo.util;
+
+import android.animation.Animator;
+import android.animation.TimeInterpolator;
+import android.annotation.TargetApi;
+import android.os.Build;
+import android.support.annotation.NonNull;
+import android.support.v4.view.animation.FastOutLinearInInterpolator;
+import android.support.v4.view.animation.FastOutSlowInInterpolator;
+import android.support.v4.view.animation.LinearOutSlowInInterpolator;
+import android.transition.Transition;
+import android.util.ArrayMap;
+import android.util.FloatProperty;
+import android.util.IntProperty;
+import android.util.Property;
+import android.view.animation.Interpolator;
+import android.view.animation.LinearInterpolator;
+
+import java.util.ArrayList;
+
+/**
+ * Utility methods for working with animations.
+ */
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
+public class AnimUtils {
+
+    private AnimUtils() { }
+
+    private static Interpolator fastOutSlowIn;
+    private static Interpolator fastOutLinearIn;
+    private static Interpolator linearOutSlowIn;
+    private static Interpolator linear;
+
+    @NonNull
+    public static Interpolator getFastOutSlowInInterpolator() {
+        if (fastOutSlowIn == null) {
+            fastOutSlowIn = new FastOutSlowInInterpolator();
+        }
+        return fastOutSlowIn;
+    }
+
+    @NonNull
+    public static Interpolator getFastOutLinearInInterpolator() {
+        if (fastOutLinearIn == null) {
+            fastOutLinearIn = new FastOutLinearInInterpolator();
+        }
+        return fastOutLinearIn;
+    }
+
+    @NonNull
+    public static Interpolator getLinearOutSlowInInterpolator() {
+        if (linearOutSlowIn == null) {
+            linearOutSlowIn = new LinearOutSlowInInterpolator();
+        }
+        return linearOutSlowIn;
+    }
+
+    @NonNull
+    public static Interpolator getLinearInterpolator() {
+        if (linear == null) {
+            linear = new LinearInterpolator();
+        }
+        return linear;
+    }
+
+    /**
+     * Linear interpolate between a and b with parameter t.
+     */
+    public static float lerp(float a, float b, float t) {
+        return a + (b - a) * t;
+    }
+
+    /**
+     * A delegate for creating a {@link Property} of <code>int</code> type.
+     */
+    public static abstract class IntProp<T> {
+
+        public final String name;
+
+        public IntProp(String name) {
+            this.name = name;
+        }
+
+        public abstract void set(T object, int value);
+        public abstract int get(T object);
+    }
+
+    /**
+     * The animation framework has an optimization for <code>Properties</code> of type
+     * <code>int</code> but it was only made public in API24, so wrap the impl in our own type
+     * and conditionally create the appropriate type, delegating the implementation.
+     */
+    public static <T> Property<T, Integer> createIntProperty(final IntProp<T> impl) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            return new IntProperty<T>(impl.name) {
+                @Override
+                public Integer get(T object) {
+                    return impl.get(object);
+                }
+
+                @Override
+                public void setValue(T object, int value) {
+                    impl.set(object, value);
+                }
+            };
+        } else {
+            return new Property<T, Integer>(Integer.class, impl.name) {
+                @Override
+                public Integer get(T object) {
+                    return impl.get(object);
+                }
+
+                @Override
+                public void set(T object, Integer value) {
+                    impl.set(object, value);
+                }
+            };
+        }
+    }
+
+    /**
+     * A delegate for creating a {@link Property} of <code>float</code> type.
+     */
+    public static abstract class FloatProp<T> {
+
+        public final String name;
+
+        protected FloatProp(String name) {
+            this.name = name;
+        }
+
+        public abstract void set(T object, float value);
+        public abstract float get(T object);
+    }
+
+    /**
+     * The animation framework has an optimization for <code>Properties</code> of type
+     * <code>float</code> but it was only made public in API24, so wrap the impl in our own type
+     * and conditionally create the appropriate type, delegating the implementation.
+     */
+    public static <T> Property<T, Float> createFloatProperty(final FloatProp<T> impl) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            return new FloatProperty<T>(impl.name) {
+                @Override
+                public Float get(T object) {
+                    return impl.get(object);
+                }
+
+                @Override
+                public void setValue(T object, float value) {
+                    impl.set(object, value);
+                }
+            };
+        } else {
+            return new Property<T, Float>(Float.class, impl.name) {
+                @Override
+                public Float get(T object) {
+                    return impl.get(object);
+                }
+
+                @Override
+                public void set(T object, Float value) {
+                    impl.set(object, value);
+                }
+            };
+        }
+    }
+
+    /**
+     * https://halfthought.wordpress.com/2014/11/07/reveal-transition/
+     * <p/>
+     * Interrupting Activity transitions can yield an OperationNotSupportedException when the
+     * transition tries to pause the animator. Yikes! We can fix this by wrapping the Animator:
+     */
+    @TargetApi(Build.VERSION_CODES.KITKAT)
+    public static class NoPauseAnimator extends Animator {
+        private final Animator mAnimator;
+        private final ArrayMap<AnimatorListener, AnimatorListener> mListeners = new ArrayMap<>();
+
+        public NoPauseAnimator(Animator animator) {
+            mAnimator = animator;
+        }
+
+        @Override
+        public void addListener(AnimatorListener listener) {
+            AnimatorListener wrapper = new AnimatorListenerWrapper(this, listener);
+            if (!mListeners.containsKey(listener)) {
+                mListeners.put(listener, wrapper);
+                mAnimator.addListener(wrapper);
+            }
+        }
+
+        @Override
+        public void cancel() {
+            mAnimator.cancel();
+        }
+
+        @Override
+        public void end() {
+            mAnimator.end();
+        }
+
+        @Override
+        public long getDuration() {
+            return mAnimator.getDuration();
+        }
+
+        @Override
+        public TimeInterpolator getInterpolator() {
+            return mAnimator.getInterpolator();
+        }
+
+        @Override
+        public void setInterpolator(TimeInterpolator timeInterpolator) {
+            mAnimator.setInterpolator(timeInterpolator);
+        }
+
+        @Override
+        public ArrayList<AnimatorListener> getListeners() {
+            return new ArrayList<>(mListeners.keySet());
+        }
+
+        @Override
+        public long getStartDelay() {
+            return mAnimator.getStartDelay();
+        }
+
+        @Override
+        public void setStartDelay(long delayMS) {
+            mAnimator.setStartDelay(delayMS);
+        }
+
+        @Override
+        public boolean isPaused() {
+            return mAnimator.isPaused();
+        }
+
+        @Override
+        public boolean isRunning() {
+            return mAnimator.isRunning();
+        }
+
+        @Override
+        public boolean isStarted() {
+            return mAnimator.isStarted();
+        }
+
+        /* We don't want to override pause or resume methods because we don't want them
+         * to affect mAnimator.
+        public void pause();
+
+        public void resume();
+
+        public void addPauseListener(AnimatorPauseListener listener);
+
+        public void removePauseListener(AnimatorPauseListener listener);
+        */
+
+        @Override
+        public void removeAllListeners() {
+            mListeners.clear();
+            mAnimator.removeAllListeners();
+        }
+
+        @Override
+        public void removeListener(AnimatorListener listener) {
+            AnimatorListener wrapper = mListeners.get(listener);
+            if (wrapper != null) {
+                mListeners.remove(listener);
+                mAnimator.removeListener(wrapper);
+            }
+        }
+
+        @Override
+        public Animator setDuration(long durationMS) {
+            mAnimator.setDuration(durationMS);
+            return this;
+        }
+
+        @Override
+        public void setTarget(Object target) {
+            mAnimator.setTarget(target);
+        }
+
+        @Override
+        public void setupEndValues() {
+            mAnimator.setupEndValues();
+        }
+
+        @Override
+        public void setupStartValues() {
+            mAnimator.setupStartValues();
+        }
+
+        @Override
+        public void start() {
+            mAnimator.start();
+        }
+    }
+
+    public static class AnimatorListenerWrapper implements Animator.AnimatorListener {
+        private final Animator mAnimator;
+        private final Animator.AnimatorListener mListener;
+
+        AnimatorListenerWrapper(Animator animator, Animator.AnimatorListener listener) {
+            mAnimator = animator;
+            mListener = listener;
+        }
+
+        @Override
+        public void onAnimationStart(Animator animator) {
+            mListener.onAnimationStart(mAnimator);
+        }
+
+        @Override
+        public void onAnimationEnd(Animator animator) {
+            mListener.onAnimationEnd(mAnimator);
+        }
+
+        @Override
+        public void onAnimationCancel(Animator animator) {
+            mListener.onAnimationCancel(mAnimator);
+        }
+
+        @Override
+        public void onAnimationRepeat(Animator animator) {
+            mListener.onAnimationRepeat(mAnimator);
+        }
+    }
+
+    @TargetApi(Build.VERSION_CODES.KITKAT)
+    public static abstract class TransitionEndListener implements Transition.TransitionListener {
+        public abstract void onTransitionCompleted(Transition transition);
+
+        @Override
+        public void onTransitionStart(Transition transition) {
+
+        }
+
+        @Override
+        public void onTransitionEnd(Transition transition) {
+            onTransitionCompleted(transition);
+        }
+
+        @Override
+        public void onTransitionCancel(Transition transition) {
+            onTransitionCompleted(transition);
+        }
+
+        @Override
+        public void onTransitionPause(Transition transition) {
+
+        }
+
+        @Override
+        public void onTransitionResume(Transition transition) {
+
+        }
+    }
+
+}

demo/src/main/res/animator/raise.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:state_enabled="true"
+        android:state_pressed="true">
+        <objectAnimator
+            android:duration="@android:integer/config_shortAnimTime"
+            android:propertyName="translationZ"
+            android:valueTo="@dimen/touch_raise" />
+    </item>
+    <item>
+        <objectAnimator
+            android:duration="@android:integer/config_shortAnimTime"
+            android:propertyName="translationZ"
+            android:valueTo="0dp" />
+    </item>
+</selector>

demo/src/main/res/drawable/dialog_bg.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <corners android:radius="@dimen/dialog_corners" />
+    <solid android:color="@color/dialog_background" />
+</shape>

demo/src/main/res/drawable/ic_arrow_forward_white_36dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="36dp"
+        android:height="36dp"
+        android:viewportHeight="24"
+        android:viewportWidth="24">
+    <path
+        android:fillColor="@color/white"
+        android:pathData="M4,11V13H16L10.5,18.5L11.92,19.92L19.84,12L11.92,4.08L10.5,5.5L16,11H4Z"/>
+</vector>

demo/src/main/res/drawable/ic_github_face.xml

@@ -0,0 +1,11 @@
+<vector
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportHeight="24"
+    android:viewportWidth="24">
+    <path
+        android:fillColor="@color/dark_icon"
+        android:pathData="M20.38,8.53C20.54,8.13 21.06,6.54 20.21,4.39C20.21,4.39 18.9,4 15.91,6C14.66,5.67 13.33,5.62 12,5.62C10.68,5.62 9.34,5.67 8.09,6C5.1,3.97 3.79,4.39 3.79,4.39C2.94,6.54 3.46,8.13 3.63,8.53C2.61,9.62 2,11 2,12.72C2,19.16 6.16,20.61 12,20.61C17.79,20.61 22,19.16 22,12.72C22,11 21.39,9.62 20.38,8.53M12,19.38C7.88,19.38 4.53,19.19 4.53,15.19C4.53,14.24 5,13.34 5.8,12.61C7.14,11.38 9.43,12.03 12,12.03C14.59,12.03 16.85,11.38 18.2,12.61C19,13.34 19.5,14.23 19.5,15.19C19.5,19.18 16.13,19.38 12,19.38M8.86,13.12C8.04,13.12 7.36,14.12 7.36,15.34C7.36,16.57 8.04,17.58 8.86,17.58C9.69,17.58 10.36,16.58 10.36,15.34C10.36,14.11 9.69,13.12 8.86,13.12M15.14,13.12C14.31,13.12 13.64,14.11 13.64,15.34C13.64,16.58 14.31,17.58 15.14,17.58C15.96,17.58 16.64,16.58 16.64,15.34C16.64,14.11 16,13.12 15.14,13.12Z"
+        />
+</vector>

demo/src/main/res/layout/controller_city_detail.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.v7.widget.RecyclerView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/recycler_view"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    />

demo/src/main/res/layout/controller_city_grid.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    android:id="@+id/city_grid_root"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:paddingStart="@dimen/activity_horizontal_margin"
+    android:paddingEnd="@dimen/activity_horizontal_margin"
+    android:gravity="center_horizontal"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:orientation="vertical" >
+
+    <ImageView
+        android:id="@+id/img_dot"
+        android:layout_width="96dp"
+        android:layout_height="96dp"
+        android:src="@drawable/circle"
+        />
+
+    <TextView
+        android:id="@+id/tv_title"
+        style="@style/Base.TextAppearance.AppCompat.Large"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="40dp"
+        />
+
+    <android.support.v7.widget.RecyclerView
+        android:id="@+id/recycler_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_marginTop="16dp"
+        />
+
+</LinearLayout>

demo/src/main/res/layout/controller_dialog.xml

@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout
+    android:id="@+id/dialog_window"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <View
+        android:id="@+id/dialog_background"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="@color/immersive_background"
+        />
+
+    <LinearLayout
+        android:id="@+id/dialog_container"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginTop="8dp"
+        android:orientation="vertical"
+        android:elevation="@dimen/dialog_elevation"
+        android:minWidth="280dp"
+        android:transitionName="@string/fab_dialog_transition_name"
+        android:layout_marginLeft="16dp"
+        android:layout_marginRight="16dp"
+        android:background="@drawable/dialog_bg"
+        android:layout_gravity="center">
+
+        <TextView
+            android:id="@+id/tv_title"
+            android:layout_marginLeft="24dp"
+            android:layout_marginRight="24dp"
+            android:layout_marginTop="24dp"
+            android:layout_marginBottom="20dp"
+            android:gravity="center_vertical"
+            style="@style/Base.DialogWindowTitle.AppCompat"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" />
+
+        <TextView
+            android:id="@+id/tv_description"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginRight="24dp"
+            android:layout_marginLeft="24dp"
+            />
+
+        <Button
+            android:id="@+id/dismiss"
+            style="@style/Widget.AppCompat.Button.Borderless.Colored"
+            android:layout_width="wrap_content"
+            android:layout_height="36dp"
+            android:layout_gravity="end|bottom"
+            android:layout_marginBottom="8dp"
+            android:layout_marginEnd="8dp"
+            android:layout_marginLeft="8dp"
+            android:layout_marginRight="8dp"
+            android:layout_marginTop="8dp"
+            android:minWidth="64dp"
+            android:text="@android:string/ok"
+            />
+
+    </LinearLayout>
+</FrameLayout>

demo/src/main/res/layout/controller_drag_dismiss.xml

@@ -34,6 +34,7 @@
                 android:layout_height="wrap_content"
                 android:background="@color/white"
                 android:padding="16dp"
+                android:text="@string/lorem_ipsum"
                 />
 
         </android.support.v4.widget.NestedScrollView>

demo/src/main/res/layout/controller_home.xml

@@ -1,8 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <FrameLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/home_root"
     android:layout_width="match_parent"
-    android:layout_height="match_parent" >
+    android:layout_height="match_parent">
 
     <android.support.v7.widget.RecyclerView
         android:id="@+id/recycler_view"
@@ -10,10 +12,20 @@
         android:layout_height="match_parent"
         />
 
-    <FrameLayout
-        android:id="@+id/overlay_root"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
+    <android.support.design.widget.FloatingActionButton
+        android:id="@+id/fab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom|end"
+        android:layout_marginBottom="@dimen/padding_normal"
+        android:layout_marginEnd="@dimen/padding_normal"
+        android:layout_marginRight="@dimen/padding_normal"
+        android:elevation="@dimen/z_fab"
+        android:scaleType="matrix"
+        android:stateListAnimator="@animator/raise"
+        android:transitionName="@string/fab_dialog_transition_name"
+        app:srcCompat="@drawable/ic_github_face"
         />
 
 </FrameLayout>
+

demo/src/main/res/layout/controller_overlay.xml

@@ -1,26 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<FrameLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:background="#88000000"
-    android:clickable="true" >
-
-    <FrameLayout
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:layout_gravity="center"
-        android:layout_margin="32dp"
-        android:background="@android:color/white">
-
-        <TextView
-            android:id="@+id/text_view"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_gravity="center"
-            android:padding="16dp"
-            />
-
-    </FrameLayout>
-
-</FrameLayout>

demo/src/main/res/layout/controller_rxlifecycle.xml

@@ -3,7 +3,6 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:background="@color/teal_300"
     android:orientation="vertical" >
 
     <TextView

demo/src/main/res/layout/controller_transition_demo.xml

@@ -29,7 +29,7 @@
         android:layout_height="wrap_content"
         android:layout_gravity="bottom|right"
         android:layout_margin="24dp"
-        android:src="@drawable/ic_arrow_forward_white_36dp"
+        app:srcCompat="@drawable/ic_arrow_forward_white_36dp"
         app:elevation="0dp"
         app:pressedTranslationZ="0dp"
         android:transitionName="@string/transition_tag_dot"

demo/src/main/res/layout/controller_transition_demo_shared.xml

@@ -22,7 +22,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center"
-        android:src="@drawable/ic_arrow_forward_white_36dp"
+        app:srcCompat="@drawable/ic_arrow_forward_white_36dp"
         app:elevation="0dp"
         app:pressedTranslationZ="0dp"
         android:transitionName="@string/transition_tag_dot"

demo/src/main/res/layout/row_city_detail.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/text_view"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    />

demo/src/main/res/layout/row_city_grid.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/row_root"
+    android:layout_width="match_parent"
+    android:layout_height="200dp"
+    android:clipChildren="false"
+    android:clipToPadding="false"
+    android:gravity="center_vertical"
+    android:orientation="vertical"
+    android:padding="8dp">
+
+    <ImageView
+        android:id="@+id/img_city"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_marginBottom="16dp"
+        android:layout_weight="1"
+        />
+
+    <TextView
+        android:id="@+id/tv_title"
+        style="@style/Base.TextAppearance.AppCompat.Large"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_horizontal"
+        />
+
+</LinearLayout>

demo/src/main/res/layout/row_city_header.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:paddingBottom="16dp" >
+
+    <ImageView
+        android:id="@+id/image_view"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:adjustViewBounds="true"
+        android:scaleType="fitCenter"
+        />
+
+    <TextView
+        android:id="@+id/text_view"
+        style="@style/Base.TextAppearance.AppCompat.Large"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        />
+
+</LinearLayout>
+

demo/src/main/res/values-sw600dp/dimens.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <!-- Custom transition dimensions -->
+    <dimen name="padding_normal">24dp</dimen>
+    <dimen name="touch_raise">9dp</dimen>
+
+</resources>

demo/src/main/res/values/colors.xml

@@ -6,6 +6,7 @@
     <color name="colorAccent">#1976d2</color>
 
     <color name="white">@android:color/white</color>
+    <color name="immersive_background">#88000000</color>
 
     <color name="red_300">#f36c60</color>
     <color name="light_green_300">#aed581</color>
@@ -27,4 +28,7 @@
     <color name="grey_300">#e0e0e0</color>
     <color name="grey_400">#78909C</color>
 
+    <color name="dark_icon">#99000000</color>
+    <color name="dialog_background">#fafafa</color>
+
 </resources>

demo/src/main/res/values/dimens.xml

@@ -5,4 +5,12 @@
 
     <dimen name="display_target_image_size">200dp</dimen>
     <dimen name="display_target_image_margin">24dp</dimen>
+
+    <!-- Custom transition dimensions -->
+    <dimen name="padding_normal">16dp</dimen>
+    <dimen name="z_fab">6dp</dimen>
+    <dimen name="touch_raise">6dp</dimen>
+    <dimen name="dialog_elevation">6dp</dimen>
+    <dimen name="dialog_corners">2dp</dimen>
+
 </resources>

demo/src/main/res/values/strings.xml

@@ -13,8 +13,6 @@
 
     <!-- Transitions Demo -->
     <string name="next">Next</string>
-    <string name="transition_tag_dot">transition.dot</string>
-    <string name="transition_tag_title">transition.title</string>
 
     <!-- Parent Controller Demo -->
     <string name="parent_controller">Parent Controller</string>
@@ -37,4 +35,18 @@
     <!-- Master/Detail Demo -->
     <string name="rotate_for_two_pane">Rotate your device for a two pane view.</string>
 
+    <!-- Transitions -->
+    <string name="fab_dialog_transition_name">transition.fab</string>
+    <string name="transition_tag_dot">transition.dot</string>
+    <string name="transition_tag_title">transition.title</string>
+    <string name="transition_tag_dot_indexed">transition.dot%1$d</string>
+    <string name="transition_tag_title_indexed">transition.title%1$d</string>
+    <string name="transition_tag_image_named">transition.image%1$s</string>
+    <string name="transition_tag_title_named">transition.title%1$s</string>
+
+    <!-- Placeholder data -->
+    <string name="lorem_ipsum">"Lorem ipsum dolor sit amet, volutpat lacus egestas integer vitae, tempus potenti posuere dolore, elit cras ut vulputate pede eros. Pharetra curabitur, cum ultrices nisi nulla, non a est diamlorem in pede. Feugiat vivamus id, leo massa, pede ligula libero wisi, posuere nec interdum risus. Mauris eros. Scelerisque etiam dignissim, sem odio magna posuere libero in. Eget non posuere, rutrum nunc ut, ipsum ornare, vestibulum nisl turpis, urna interdum. Arcu mi velit. Sem dolor amet sed hymenaeos tempor. Cras felis.\n" +
+                "Tempus risus vehicula, mauris nulla interdum purus sodales suspendisse, morbi ultrices tempus vitae vestibulum porttitor, vel mus enim tellus non massa in, quis nec fermentum scelerisque sem congue dolores. Accumsan lacinia urna eu feugiat, habitasse wisi cras id nonummy sapien, a pede. Turpis ac donec, adipiscing ut faucibus, odio ut morbi, habitant volutpat lacinia. At vitae ipsum, porttitor wisi hendrerit pellentesque sapien, suspendisse pellentesque praesent sit tellus varius. At in ligula neque imperdiet eget, viverra lectus risus est sem feugiat. Diam amet non phasellus, sed enim ante etiam lorem id at, feugiat eu urna, urna posuere. Amet vel, vehicula ac in fermentum id, elit mauris dolor, eget orci in nec non in vestibulum. Tortor risus mattis, massa vel condimentum non ornare, pede nunc curabitur dui, eu dolorum luctus duis pellentesque. Nec in imperdiet ac tortor pulvinar bibendum. Parturient lacus luctus posuere, quis luctus sociis tellus iaculis.\n" +
+                "Eu nec, nulla ut neque ac suspendisse, ac purus mattis pretium orci orci, penatibus sollicitudin pellentesque massa, felis et molestie natoque justo vitae. Laoreet nunc nulla augue semper, nulla ridiculus elit in quis bibendum ultrices, integer duis. Dolor ut donec ligula vehicula odio, in lacinia mattis ut quos, semper libero nulla, et euismod ut, nec curabitur turpis aliquet mauris sit a. Tellus interdum dignissim felis. Ultrices dignissim ut, enim urna adipiscing, nunc accumsan justo odio fringilla magna penatibus. Amet integer metus sollicitudin tristique libero dolor, augue nulla pellentesque, massa in suspendisse, adipiscing donec neque nunc. Malesuada non, luctus vestibulum, et at taciti orci felis. Aliquam dolor nibh erat in tincidunt in, risus suscipit integer, quis dolor quis quam. Ultrices dictum, dignissim interdum aenean pede ornare pretium, vehicula adipiscing enim nec magna mollis duis. Imperdiet dolor velit phasellus, laoreet sed ridiculus sollicitudin sit viverra metus, integer sit nunc fusce nonummy augue. Maecenas adipiscing porttitor eu risus nunc malesuada, quo vitae blandit amet feugiat nunc. Pede hac duis in.\n" +
+                "Lorem posuere ridiculus donec, volutpat vehicula erat nunc ut, justo occaecati vivamus aliquam massa, felis etiam, sed feugiat molestie eu. Et leo non dignissim nam. Fringilla pretium suspendisse vitae nascetur massa hymenaeos, lectus ut senectus amet, a enim. Pellentesque integer erat, mauris morbi pellentesque, sodales phasellus turpis purus nulla porta, massa vulputate consectetuer habitasse malesuada pulvinar, vehicula in elit eros interdum ut. Et enim vulputate, aliquam donec ullamcorper et, vel consequat tincidunt. Ipsum quam sed ante quis at, ultrices eget. Rutrum qui et velit possimus in, odio amet ut adipiscing sed nec, a tellus ut, quam molestie. Nisl adipiscing euismod nec, eget facilisis ac sit. Suspendisse elit amet consequat dolor senectus vivamus, at scelerisque erat, odio doloribus velit et felis neque, turpis adipiscing, arcu varius placerat leo."</string>
 </resources>

dependencies.gradle

@@ -2,13 +2,13 @@ ext {
     minSdkVersion = 16
     compileSdkVersion = 25
     targetSdkVersion = 25
-    buildToolsVersion = '24.0.3'
+    buildToolsVersion = '25.0.0'
 
-    supportVersion = '23.1.1'
-    butterknifeVersion = '8.0.1'
+    supportVersion = '25.0.0'
+    butterknifeVersion = '8.4.0'
     picassoVersion = '2.5.2'
-    leakCanaryVersion = '1.4'
-    rxJavaVersion = '1.2.0'
+    leakCanaryVersion = '1.5'
+    rxJavaVersion = '1.2.1'
     rxJava2Version = '2.0.1'
     rxLifecycleVersion = '0.8.0'
     rxLifecycle2Version = '2.0'
@@ -45,5 +45,4 @@ ext {
     lintchecks = "com.android.tools.lint:lint-checks:$lintVersion"
     lint = "com.android.tools.lint:lint:$lintVersion"
     lintTests = "com.android.tools.lint:lint-tests:$lintVersion"
-
 }

gradle.properties

@@ -1,4 +1,4 @@
-VERSION_NAME=2.1.1-SNAPSHOT
+VERSION_NAME=2.1.4-SNAPSHOT
 VERSION_CODE=2
 GROUP=com.bluelinelabs
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Mon Sep 05 10:45:48 CDT 2016
+#Tue Feb 07 10:14:44 CST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip