WIP: add default destination.

Issue #130

README.md

@@ -6,15 +6,39 @@
 [![Android Weekly](https://img.shields.io/badge/Android%20Weekly-250-green.svg)](http://androidweekly.net/issues/issue-250)
 [![Android Weekly](https://img.shields.io/badge/Android%20Weekly-271-green.svg)](http://androidweekly.net/issues/issue-271)  
 
-![](https://habrastorage.org/files/644/32e/9eb/64432e9eb3664723b3ee438449dab3b0.png)
+<table>
+    <tr>
+        <td>
+            <img src="https://github.com/terrakok/Cicerone/raw/master/media/navigation.gif" width="256"/>
+        </td>
+        <td>
+            <img src="https://github.com/terrakok/Cicerone/raw/master/media/insta_tabs.gif" width="256"/>
+        </td>
+        <td>
+            <img src="https://github.com/terrakok/Cicerone/raw/master/media/animations.gif" width="256"/>
+        </td>
+    </tr>
+    <tr>
+        <td>
+            Power navigation
+        </td>
+        <td>
+            Multibackstack
+        </td>
+        <td>
+            Result listeners
+        </td>
+    </tr>
+</table>
 
-Cicerone (a guide, one who conducts sightseers) is a lightweight library that makes the navigation in an Android app easy.  
+Cicerone (means - a guide, one who conducts sightseers) is a lightweight library that makes the navigation in an Android app easy.  
 It was designed to be used with the MVP/MVVM/MVI patterns but will work great with any architecture.
 
 ## Main advantages
 + is not tied to Fragments
-+ not a framework
++ not a framework (very lightweight)
 + short navigation calls (no builders)
++ static typed checks for screen parameters!
 + lifecycle-safe!
 + functionality is simple to extend
 + suitable for Unit Testing
@@ -109,13 +133,13 @@ override fun onPause() {
 ## Navigation commands
 This commands set will fulfill the needs of the most applications. But if you need something special - just add it!
 + Forward - Opens new screen
-![](https://github.com/terrakok/Cicerone/raw/develop/media/forward_img.png)
+![](https://github.com/terrakok/Cicerone/raw/master/media/forward_img.png)
 + Back - Rolls back the last transition
-![](https://github.com/terrakok/Cicerone/raw/develop/media/back_img.png)
+![](https://github.com/terrakok/Cicerone/raw/master/media/back_img.png)
 + BackTo - Rolls back to the needed screen in the screens chain
-![](https://github.com/terrakok/Cicerone/raw/develop/media/backTo_img.png)
+![](https://github.com/terrakok/Cicerone/raw/master/media/backTo_img.png)
 + Replace - Replaces the current screen
-![](https://github.com/terrakok/Cicerone/raw/develop/media/replace_img.png)
+![](https://github.com/terrakok/Cicerone/raw/master/media/replace_img.png)
 
 ## Predefined navigator
 The library provides predefined navigator for _Fragments_ and _Activity_.
@@ -147,21 +171,22 @@ private val navigator = object : AppNavigator(this, R.id.container) {
 Describe your screens as you like e.g. create Kotlin `object` with all application screens:
 ```kotlin
 object Screens {
-    val Main = FragmentScreen("MainFragment") { MainFragment() }
-    val AddressSearch = FragmentScreen("AddressSearchFragment") { AddressSearchFragment() }
-    fun Profile(userId: Long) = FragmentScreen("ProfileFragment") { ProfileFragment(userId) }
+    fun Main() = FragmentScreen { MainFragment() }
+    fun AddressSearch() = FragmentScreen { AddressSearchFragment() }
+    fun Profile(userId: Long) = FragmentScreen("Profile_$userId") { ProfileFragment(userId) }
+    fun Browser(url: String) = ActivityScreen { Intent(Intent.ACTION_VIEW, Uri.parse(url))  }
 }
 ```
 
 Additional you can use `FragmentFactory` for creating your screens:
 ```kotlin
-val SomeScreen = FragmentScreen("SomeScreenId") { factory: FragmentFactory -> ... }
+fun SomeScreen() = FragmentScreen { factory: FragmentFactory -> ... }
 ```
 
 ## Screen parameters and result listener
 ```kotlin
 //you have to specify screen parameters via new FragmentScreen creation
-fun SelectPhoto(resultKey: String) = FragmentScreen("SelectPhoto") {
+fun SelectPhoto(resultKey: String) = FragmentScreen {
     SelectPhotoFragment.getNewInstance(resultKey)
 }
 ```
@@ -188,9 +213,16 @@ To see how to add, initialize and use the library and predefined navigators see
 
 For more complex use case check out the [GitFox (Android GitLab client)](https://gitlab.com/terrakok/gitlab-client)
 
-![](https://github.com/terrakok/Cicerone/raw/develop/media/navigation.gif)
-![](https://github.com/terrakok/Cicerone/raw/develop/media/insta_tabs.gif)
-![](https://github.com/terrakok/Cicerone/raw/develop/media/animations.gif)
+## Applications with Cicerone inside
+<a href="https://play.google.com/store/apps/details?id=ru.foodfox.client"><img src="https://play-lh.googleusercontent.com/gWYedIqy8QujCQOn0kzEIBEkGLBSpuKvFm-fMcfkWnJ1Oirtv847xAE4OyhAaohdcp5V=s360" width="64" /> Яндекс.Еда — доставка еды/продуктов. Food delivery</a><br>
+<a href="https://play.google.com/store/apps/details?id=com.foodient.whisk"><img src="https://play-lh.googleusercontent.com/eKotZjJcZOU2_L9t2l34EEY7aGl5zhvKVuEbF0Kc4MRs_pAC2SJgOnWMkMTFjR_e9EY=s360" width="64" /> Whisk: Recipe Saver, Meal Planner & Grocery List</a><br>
+<a href="https://play.google.com/store/apps/details?id=kz.beeline.odp"><img src="https://play-lh.googleusercontent.com/hzgjpQQpy6Z-Byye0aVKSv9P7h8yx58i6pVkQtiM6jB99iWFXjYfKeaPqJ3wm6Rtb38=s360" width="64" /> Мой Beeline (Казахстан)</a><br>
+<a href="https://play.google.com/store/apps/details?id=com.mercuryo.app"><img src="https://play-lh.googleusercontent.com/FKulXdc15r5PWX6hTZi2i3iaJjcQHwd9xParp6YPiQ2KiBqza7jwEt_b_tqLwXpyEHg=s360" width="64" /> Mercuryo Bitcoin Cryptowallet</a><br>
+<a href="https://play.google.com/store/apps/details?id=com.warefly.checkscan"><img src="https://play-lh.googleusercontent.com/2c2uuiSl2vwGgp-vdI-VArQEMdSSXk1neUK5A-Udc0WANPcvp5kBJFEugrFiXnxUc7k=s360" width="64" /> ЧекСкан - кэшбэк за чеки, цены и акции в магазинах</a><br>
+<a href="https://github.com/eduard1abdulmanov123/News"><img src="https://raw.githubusercontent.com/eduard1abdulmanov123/News/dev/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png" width="64" /> RSS Reader для Вести.Ru</a><br>
+<a href="https://play.google.com/store/apps/details?id=com.epam.connect.android"><img src="https://play-lh.googleusercontent.com/aN7R6BiR7yt7b3oEoBI30pVwzsdzaWe3TWpw8c9igqoOj79Pm2xVh4_C4qwjSKwjVio=s360" width="64" /> EPAM Connect</a><br>
+<a href="https://play.google.com/store/apps/details?id=org.consumerreports.ratings"><img src="https://play-lh.googleusercontent.com/dEdOwZOjXAdamytxY1TgY8LS-Hc9FKCcit5HP1RyaKqRAWjDJEyFSQS1XlqQPpeY5UI=s360" width="64" /> Consumer Reports: Product Reviews & Ratings</a><br>
+<a href="https://play.google.com/store/apps/details?id=ru.zakaz.android"><img src="https://play-lh.googleusercontent.com/jj18yK2dB2MHZ_QdO21aXyznGXteIF2q4mgxY4ubLhFv9gwZqHVDeu1i2FmanS-0Furm=s360" width="64" /> Zakaz.ru</a><br>
 
 ## Participants
 + idea and code - Konstantin Tskhovrebov (@terrakok)

library/build.gradle

@@ -18,7 +18,7 @@ ext {
     bintrayName = 'cicerone-kotlin'
     publishedGroupId = 'com.github.terrakok'
     artifact = 'cicerone'
-    libraryVersion = '6.2'
+    libraryVersion = '6.6'
     gitUrl = 'https://github.com/terrakok/Cicerone'
     allLicenses = ['MIT']
 }

library/src/main/kotlin/com/github/terrakok/cicerone/BaseRouter.kt

@@ -10,12 +10,16 @@ abstract class BaseRouter {
     private val resultWire = ResultWire()
 
     /**
-     * Sets data listener with given key.
+     * Sets data listener with given key
+     * and returns [ResultListenerHandler] for availability to dispose subscription.
      *
      * After first call listener will be removed.
      */
-    fun setResultListener(key: String, listener: (data: Any) -> Unit) {
-        resultWire.setResultListener(key, listener)
+    fun setResultListener(
+        key: String,
+        listener: ResultListener
+    ): ResultListenerHandler {
+        return resultWire.setResultListener(key, listener)
     }
 
     /**
@@ -32,6 +36,5 @@ abstract class BaseRouter {
      */
     protected fun executeCommands(vararg commands: Command) {
         commandBuffer.executeCommands(commands)
-        resultWire.flush()
     }
 }

library/src/main/kotlin/com/github/terrakok/cicerone/Cicerone.kt

@@ -17,12 +17,14 @@ class Cicerone<T : BaseRouter> private constructor(val router: T) {
         /**
          * Creates the Cicerone instance with the default [Router]
          */
+        @JvmStatic
         fun create() = create(Router())
 
         /**
          * Creates the Cicerone instance with the custom router.
          * @param customRouter the custom router extending [BaseRouter]
          */
+        @JvmStatic
         fun <T : BaseRouter> create(customRouter: T) = Cicerone(customRouter)
     }
 }

library/src/main/kotlin/com/github/terrakok/cicerone/ResultWire.kt

@@ -1,23 +1,30 @@
 package com.github.terrakok.cicerone
 
-import java.lang.ref.WeakReference
+/**
+ * Interface definition for a result callback.
+ */
+fun interface ResultListener {
+    fun onResult(data: Any)
+}
+
+/**
+ * Handler for manual delete subscription and avoid leak
+ */
+fun interface ResultListenerHandler {
+    fun dispose()
+}
 
 internal class ResultWire {
-    private val listeners = mutableMapOf<String, WeakReference<(Any) -> Unit>>()
+    private val listeners = mutableMapOf<String, ResultListener>()
 
-    fun setResultListener(key: String, listener: (data: Any) -> Unit) {
-        listeners[key] = WeakReference(listener)
-    }
-
-    fun sendResult(key: String, data: Any) {
-        listeners.remove(key)?.get()?.let { listener ->
-            listener(data)
+    fun setResultListener(key: String, listener: ResultListener): ResultListenerHandler {
+        listeners[key] = listener
+        return ResultListenerHandler {
+            listeners.remove(key)
         }
     }
 
-    fun flush() {
-        listeners.entries
-            .filter { it.value.get() == null }
-            .forEach { listeners.remove(it.key) }
+    fun sendResult(key: String, data: Any) {
+        listeners.remove(key)?.onResult(data)
     }
 }

library/src/main/kotlin/com/github/terrakok/cicerone/Router.kt

@@ -14,6 +14,7 @@ open class Router : BaseRouter() {
      * @param screen screen
      * @param clearContainer if FALSE then new screen shows over previous
      */
+    @JvmOverloads
     fun navigateTo(screen: Screen, clearContainer: Boolean = true) {
         executeCommands(Forward(screen, clearContainer))
     }
@@ -58,6 +59,7 @@ open class Router : BaseRouter() {
      * @param screens
      * @param showOnlyTopScreenView if FALSE then all screen views show together
      */
+    @JvmOverloads
     fun newChain(vararg screens: Screen, showOnlyTopScreenView: Boolean = true) {
         val commands = screens.map { Forward(it, showOnlyTopScreenView) }
         executeCommands(*commands.toTypedArray())
@@ -69,6 +71,7 @@ open class Router : BaseRouter() {
      * @param screens
      * @param showOnlyTopScreenView if FALSE then all screen views show together
      */
+    @JvmOverloads
     fun newRootChain(vararg screens: Screen, showOnlyTopScreenView: Boolean = true) {
         val commands = screens.mapIndexed { index, screen ->
             if (index == 0)

library/src/main/kotlin/com/github/terrakok/cicerone/Screen.kt

@@ -1,8 +1,8 @@
 package com.github.terrakok.cicerone
 
 /**
- * Screen is class for description application screen.
+ * Screen is interface for description application screen.
  */
-abstract class Screen {
-    open val screenKey: String = this::class.qualifiedName!!
+interface Screen {
+    val screenKey: String get() = this::class.java.name
 }

library/src/main/kotlin/com/github/terrakok/cicerone/androidx/AppNavigator.kt

@@ -1,5 +1,6 @@
 package com.github.terrakok.cicerone.androidx
 
+import android.content.ActivityNotFoundException
 import android.content.Intent
 import androidx.fragment.app.*
 import com.github.terrakok.cicerone.*
@@ -13,11 +14,11 @@ import com.github.terrakok.cicerone.androidx.TransactionInfo.Type.REPLACE
  *
  * Recommendation: most useful for Single-Activity application.
  */
-open class AppNavigator constructor(
+open class AppNavigator @JvmOverloads constructor(
     protected val activity: FragmentActivity,
     protected val containerId: Int,
     protected val fragmentManager: FragmentManager = activity.supportFragmentManager,
-    protected val fragmentFactory: FragmentFactory = FragmentFactory()
+    protected val fragmentFactory: FragmentFactory = fragmentManager.fragmentFactory
 ) : Navigator {
 
     protected val localStackCopy = mutableListOf<TransactionInfo>()
@@ -109,6 +110,7 @@ open class AppNavigator constructor(
     ) {
         val fragment = screen.createFragment(fragmentFactory)
         val transaction = fragmentManager.beginTransaction()
+        transaction.setReorderingAllowed(true)
         setupFragmentTransaction(
             transaction,
             fragmentManager.findFragmentById(containerId),
@@ -170,9 +172,9 @@ open class AppNavigator constructor(
     private fun checkAndStartActivity(screen: ActivityScreen) {
         // Check if we can start activity
         val activityIntent = screen.createIntent(activity)
-        if (activityIntent.resolveActivity(activity.packageManager) != null) {
+        try {
             activity.startActivity(activityIntent, screen.startActivityOptions)
-        } else {
+        } catch (e: ActivityNotFoundException) {
             unexistingActivity(screen, activityIntent)
         }
     }

library/src/main/kotlin/com/github/terrakok/cicerone/androidx/AppScreen.kt

@@ -7,16 +7,25 @@ import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentFactory
 import com.github.terrakok.cicerone.Screen
 
-sealed class AppScreen : Screen()
+sealed class AppScreen : Screen
 
-open class FragmentScreen(
-    override val screenKey: String,
-    val createFragment: (FragmentFactory) -> Fragment
-) : AppScreen()
+fun interface Creator<A, R> {
+    fun create(argument: A): R
+}
 
-open class ActivityScreen(
-    override val screenKey: String,
-    val createIntent: (context: Context) -> Intent
+open class FragmentScreen @JvmOverloads constructor(
+    private val key: String? = null,
+    private val fragmentCreator: Creator<FragmentFactory, Fragment>
 ) : AppScreen() {
+    override val screenKey: String get() = key ?: super.screenKey
+    fun createFragment(factory: FragmentFactory) = fragmentCreator.create(factory)
+}
+
+open class ActivityScreen @JvmOverloads constructor(
+    private val key: String? = null,
+    private val intentCreator: Creator<Context, Intent>
+) : AppScreen() {
+    override val screenKey: String get() = key ?: super.screenKey
     open val startActivityOptions: Bundle? = null
+    fun createIntent(context: Context) = intentCreator.create(context)
 }

library/src/main/kotlin/com/github/terrakok/cicerone/androidx/TransactionInfo.kt

@@ -12,6 +12,7 @@ data class TransactionInfo(
     override fun toString() = screenKey + type.symbol
 
     companion object {
+        @JvmStatic
         fun fromString(str: String) = TransactionInfo(
             str.dropLast(1),
             if (str.last() == Type.ADD.symbol) Type.ADD else Type.REPLACE

library/src/main/kotlin/com/github/terrakok/cicerone/graph/GraphRouter.kt

@@ -0,0 +1,134 @@
+package com.github.terrakok.cicerone.graph
+
+import com.github.terrakok.cicerone.*
+
+
+class GraphRouter(
+    private val root: Root
+) : BaseRouter() {
+    private val vertexes: Map<String, Vertex>
+    private val currentPath: MutableList<String>
+    val currentVertex get() = vertexes.getValue(currentPath.last())
+
+    init {
+        val allVertexes = mutableMapOf<String, Vertex>()
+        val links = mutableSetOf<VertexLink>()
+        val jumps = mutableListOf<List<String>>()
+        validateGraph(root.vertex, allVertexes, links, jumps)
+
+        val linkAndJumpIds = links.map { it.id } + jumps.flatten()
+        linkAndJumpIds.forEach { id ->
+            require(allVertexes.containsKey(id)) { "Not found vertex for id=$id" }
+        }
+
+        vertexes = allVertexes
+        currentPath = mutableListOf(root.vertex.id)
+
+        jumps.forEach {
+            require(validateJump(it)) { "Invalid jump path=$it" }
+        }
+
+        if (root.defaultDestination != null) {
+            require(root.vertex.edges.any { it.id == root.defaultDestination })  { "Not found default destination" }
+            navigateTo(root.defaultDestination)
+        }
+    }
+
+    private fun validateGraph(
+        vertex: Vertex,
+        allVertexes: MutableMap<String, Vertex>,
+        links: MutableSet<VertexLink>,
+        jumps: MutableList<List<String>>
+    ) {
+        if (allVertexes.containsKey(vertex.id)) error("Graph contains duplicate id ${vertex.id}")
+        allVertexes[vertex.id] = vertex
+
+        links.addAll(vertex.edges.filterIsInstance<VertexLink>())
+        jumps.addAll(vertex.jumps.map { listOf(it.backTo ?: vertex.id, *it.chain.toTypedArray()) })
+        vertex.edges.forEach {
+            if (it !is VertexLink) validateGraph(it, allVertexes, links, jumps)
+        }
+    }
+
+    private fun validateJump(path: List<String>): Boolean {
+        if (path.isEmpty()) return false
+        if (path.size == 1) return true
+
+        val v = vertexes.getValue(path[0])
+        v.edges.firstOrNull { it.id == path[1] } ?: return false
+        return validateJump(path.subList(1, path.size))
+    }
+
+    fun navigateTo(
+        vertexId: String,
+        screenFactory: (vertexId: String) -> Screen? = { null }
+    ) {
+        val destination = currentVertex.edges.first { it.id == vertexId }
+        val screen = createScreen(destination.id, screenFactory)
+        val command =
+            if (currentVertex.id == Root.ID) Replace(screen)
+            else Forward(screen, destination.destroyPreviousView)
+        currentPath.add(destination.id)
+        executeCommands(command)
+    }
+
+    fun jumpTo(
+        jumpId: String,
+        screenFactory: (vertexId: String) -> Screen? = { null }
+    ) {
+        val jump = currentVertex.jumps.first { it.id == jumpId }
+
+        if (jump.backTo == Root.ID && jump.chain.isEmpty()) {
+            finish()
+            return
+        }
+
+        val commands = mutableListOf<Command>().apply {
+            if (jump.backTo != null) {
+                val id = jump.backTo
+                val index = currentPath.indexOfFirst { it == id }
+                if (index == -1) error("Current path doesn't contain vertex $id")
+                currentPath.subList(index + 1, currentPath.size).clear()
+                if (jump.backTo == Root.ID) add(BackTo(null))
+                else add(BackTo(Key(id)))
+            }
+            jump.chain.forEachIndexed { index, vertexId ->
+                val screen = createScreen(vertexId, screenFactory)
+                currentPath.add(vertexId)
+                if (index == 0 && jump.backTo == Root.ID) {
+                    add(Replace(screen))
+                } else {
+                    add(Forward(screen, vertexes.getValue(vertexId).destroyPreviousView))
+                }
+            }
+        }
+
+        executeCommands(*commands.toTypedArray())
+    }
+
+    fun exit() {
+        currentPath.removeLast()
+        executeCommands(Back())
+    }
+
+    private fun finish() {
+        currentPath.clear()
+        currentPath.add(Root.ID)
+        executeCommands(BackTo(null), Back())
+    }
+
+    private fun createScreen(
+        vertexId: String,
+        screenFactory: (vertexId: String) -> Screen?
+    ): Screen {
+        val screen = screenFactory(vertexId)
+            ?: vertexes.getValue(vertexId).screenFactory(vertexId)
+            ?: error("Unknown screen for vertex $vertexId")
+        require(screen.screenKey == vertexId) { "Screen key must be equal vertex id!" }
+        return screen
+    }
+
+    private class Key(
+        override val screenKey: String
+    ) : Screen
+}

library/src/main/kotlin/com/github/terrakok/cicerone/graph/Vertex.kt

@@ -0,0 +1,134 @@
+package com.github.terrakok.cicerone.graph
+
+import com.github.terrakok.cicerone.*
+
+open class Vertex internal constructor(
+    val id: String,
+    val edges: Set<Vertex>,
+    val jumps: Set<Jump>,
+    val destroyPreviousView: Boolean = true,
+    val screenFactory: (id: String) -> Screen? = { null }
+) {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as Vertex
+
+        if (id != other.id) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        return id.hashCode()
+    }
+}
+
+internal class VertexLink(
+    id: String,
+    destroyPreviousView: Boolean = true
+): Vertex(id, emptySet(), emptySet(), destroyPreviousView)
+
+class Jump(
+    val id: String,
+    val backTo: String?,
+    val chain: List<String>
+) {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as Jump
+
+        if (id != other.id) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        return id.hashCode()
+    }
+}
+
+//Graph DSL
+
+class GraphInfo(
+    var edges: MutableSet<Vertex>.() -> Unit = {},
+    var jumps: MutableSet<Jump>.() -> Unit = {}
+)
+
+class Root(
+    val vertex: Vertex,
+    val defaultDestination: String?
+) {
+    companion object {
+        const val ID = "graph-root"
+    }
+}
+
+fun graph(
+    defaultDestination: String? = null,
+    setup: GraphInfo.() -> Unit
+): Root {
+    val info = GraphInfo().apply(setup)
+    val v = Vertex(
+        Root.ID,
+        mutableSetOf<Vertex>().apply(info.edges),
+        mutableSetOf<Jump>().apply(info.jumps)
+    )
+    return Root(v, defaultDestination)
+}
+
+class VertexInfo(
+    var edges: MutableSet<Vertex>.() -> Unit = {},
+    var jumps: MutableSet<Jump>.() -> Unit = {},
+    var screen: (id: String) -> Screen? = { null }
+)
+
+fun MutableSet<Vertex>.dest(
+    id: String,
+    destroyPreviousView: Boolean = true,
+    setup: VertexInfo.() -> Unit = {}
+) {
+    val info = VertexInfo().apply(setup)
+    add(Vertex(
+        id,
+        mutableSetOf<Vertex>().apply(info.edges),
+        mutableSetOf<Jump>().apply(info.jumps),
+        destroyPreviousView,
+        info.screen
+    ))
+}
+
+fun MutableSet<Vertex>.edge(
+    id: String,
+    destroyPreviousView: Boolean = true
+) {
+    add(VertexLink(id, destroyPreviousView))
+}
+
+class JumpInfo(
+    var backTo: String? = null,
+    internal var chain: List<String> = emptyList()
+) {
+    fun chain(vararg id: String) {
+        chain = id.toList()
+    }
+}
+
+fun MutableSet<Jump>.jump(
+    id: String,
+    setup: JumpInfo.() -> Unit
+) {
+    val info = JumpInfo().apply(setup)
+    add(Jump(
+        id,
+        info.backTo,
+        info.chain
+    ))
+}
+
+fun MutableSet<Jump>.finish(id: String) {
+    add(Jump(id, Root.ID, emptyList()))
+}

library/stub-android/src/main/java/androidx/fragment/app/FragmentManager.java

@@ -36,6 +36,10 @@ public class FragmentManager {
         throw new RuntimeException("Stub!");
     }
 
+    public FragmentFactory getFragmentFactory() {
+        throw new RuntimeException("Stub!");
+    }
+
     public interface BackStackEntry {
         int getId();
 

library/stub-android/src/main/java/androidx/fragment/app/FragmentTransaction.java

@@ -6,6 +6,10 @@ package androidx.fragment.app;
  */
 
 public class FragmentTransaction {
+    public FragmentTransaction setReorderingAllowed(boolean reorderingAllowed) {
+        throw new RuntimeException("Stub!");
+    }
+
     public FragmentTransaction add(int containerViewId, Fragment fragment, String tag) {
         throw new RuntimeException("Stub!");
     }

sample/src/main/AndroidManifest.xml

@@ -21,5 +21,6 @@
         <activity android:name=".ui.main.MainActivity"/>
         <activity android:name=".ui.bottom.BottomNavigationActivity"/>
         <activity android:name=".ui.animations.ProfileActivity"/>
+        <activity android:name=".ui.graph.GraphActivity"/>
     </application>
 </manifest>

sample/src/main/java/com/github/terrakok/cicerone/sample/NavGraph.kt

@@ -0,0 +1,75 @@
+package com.github.terrakok.cicerone.sample
+
+import com.github.terrakok.cicerone.androidx.FragmentScreen
+import com.github.terrakok.cicerone.graph.*
+import com.github.terrakok.cicerone.sample.ui.graph.ForkFragment
+import com.github.terrakok.cicerone.sample.ui.graph.RoadFragment
+
+private val RoadScreen = { id: String -> FragmentScreen(id) { RoadFragment.getNewInstance(id) } }
+private val ForkScreen = { id: String -> FragmentScreen(id) { ForkFragment.getNewInstance(id) } }
+
+fun Graph() = graph("8") {
+    edges = {
+        dest("1") {
+            screen = RoadScreen
+            edges = {
+                dest("2") {
+                    screen = ForkScreen
+                    edges = {
+                        dest("3") {
+                            screen = RoadScreen
+                            edges = {
+                                dest("4") {
+                                    screen = RoadScreen
+                                    edges = {
+                                        edge("5")
+                                    }
+                                }
+                            }
+                        }
+                        dest("5") {
+                            screen = ForkScreen
+                            edges = {
+                                dest("6") {
+                                    screen = RoadScreen
+                                }
+                                dest("7") {
+                                    screen = RoadScreen
+                                    jumps = {
+                                        finish("1")
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        dest("8") {
+            screen = ForkScreen
+            edges = {
+                dest("9") {
+                    screen = RoadScreen
+                    edges = {
+                        edge("1")
+                    }
+                    jumps = {
+                        jump("1") {
+                            backTo = Root.ID
+                            chain("1", "2", "3", "4", "5", "7")
+                        }
+                    }
+                }
+                dest("10") {
+                    screen = ForkScreen
+                    edges = {
+                        dest("11") {
+                            screen = RoadScreen
+                        }
+                        edge("10")
+                    }
+                }
+            }
+        }
+    }
+}

sample/src/main/java/com/github/terrakok/cicerone/sample/Screens.kt

@@ -10,6 +10,7 @@ import com.github.terrakok.cicerone.sample.ui.animations.profile.ProfileFragment
 import com.github.terrakok.cicerone.sample.ui.bottom.BottomNavigationActivity
 import com.github.terrakok.cicerone.sample.ui.bottom.ForwardFragment
 import com.github.terrakok.cicerone.sample.ui.bottom.TabContainerFragment
+import com.github.terrakok.cicerone.sample.ui.graph.GraphActivity
 import com.github.terrakok.cicerone.sample.ui.main.MainActivity
 import com.github.terrakok.cicerone.sample.ui.main.SampleFragment
 import com.github.terrakok.cicerone.sample.ui.start.StartActivity
@@ -24,39 +25,43 @@ object Screens {
         SampleFragment.getNewInstance(number)
     }
 
-    fun Start() = ActivityScreen("Start") {
+    fun Start() = ActivityScreen {
         Intent(it, StartActivity::class.java)
     }
 
-    fun Main() = ActivityScreen("Main") {
+    fun Main() = ActivityScreen {
         Intent(it, MainActivity::class.java)
     }
 
-    fun BottomNavigation() = ActivityScreen("BottomNavigation") {
+    fun BottomNavigation() = ActivityScreen {
         Intent(it, BottomNavigationActivity::class.java)
     }
 
-    fun Tab(tabName: String) = FragmentScreen("Tab") {
+    fun Tab(tabName: String) = FragmentScreen {
         TabContainerFragment.getNewInstance(tabName)
     }
 
-    fun Forward(containerName: String, number: Int) = FragmentScreen("Forward") {
+    fun Forward(containerName: String, number: Int) = FragmentScreen {
         ForwardFragment.getNewInstance(containerName, number)
     }
 
-    fun Github() = ActivityScreen("Github") {
+    fun Github() = ActivityScreen {
         Intent(Intent.ACTION_VIEW, Uri.parse("https://github.com/terrakok/Cicerone"))
     }
 
-    fun Profile() = ActivityScreen("Profile") {
+    fun Profile() = ActivityScreen {
         Intent(it, ProfileActivity::class.java)
     }
 
-    fun ProfileInfo() = FragmentScreen("ProfileInfo") {
+    fun ProfileInfo() = FragmentScreen {
         ProfileFragment()
     }
 
-    fun SelectPhoto(resultKey: String) = FragmentScreen("SelectPhoto") {
+    fun SelectPhoto(resultKey: String) = FragmentScreen {
         SelectPhotoFragment.getNewInstance(resultKey)
     }
+
+    fun Graph() = ActivityScreen {
+        Intent(it, GraphActivity::class.java)
+    }
 }

sample/src/main/java/com/github/terrakok/cicerone/sample/dagger/AppComponent.kt

@@ -7,6 +7,9 @@ import com.github.terrakok.cicerone.sample.ui.animations.photos.SelectPhotoFragm
 import com.github.terrakok.cicerone.sample.ui.animations.profile.ProfileFragment
 import com.github.terrakok.cicerone.sample.ui.bottom.BottomNavigationActivity
 import com.github.terrakok.cicerone.sample.ui.bottom.TabContainerFragment
+import com.github.terrakok.cicerone.sample.ui.graph.ForkFragment
+import com.github.terrakok.cicerone.sample.ui.graph.GraphActivity
+import com.github.terrakok.cicerone.sample.ui.graph.RoadFragment
 import com.github.terrakok.cicerone.sample.ui.main.MainActivity
 import com.github.terrakok.cicerone.sample.ui.main.SampleFragment
 import com.github.terrakok.cicerone.sample.ui.start.StartActivity
@@ -37,4 +40,10 @@ interface AppComponent {
     fun inject(fragment: SelectPhotoFragment)
 
     fun inject(activity: ProfileActivity)
+
+    fun inject(activity: GraphActivity)
+
+    fun inject(fragment: RoadFragment)
+
+    fun inject(fragment: ForkFragment)
 }

sample/src/main/java/com/github/terrakok/cicerone/sample/dagger/module/NavigationModule.kt

@@ -4,8 +4,11 @@ import com.github.terrakok.cicerone.Cicerone
 import com.github.terrakok.cicerone.Cicerone.Companion.create
 import com.github.terrakok.cicerone.NavigatorHolder
 import com.github.terrakok.cicerone.Router
+import com.github.terrakok.cicerone.graph.GraphRouter
+import com.github.terrakok.cicerone.sample.Graph
 import dagger.Module
 import dagger.Provides
+import javax.inject.Named
 import javax.inject.Singleton
 
 /**
@@ -14,6 +17,7 @@ import javax.inject.Singleton
 @Module
 class NavigationModule {
     private val cicerone: Cicerone<Router> = create()
+    private val graphCicerone: Cicerone<GraphRouter> = create(GraphRouter(Graph()))
 
     @Provides
     @Singleton
@@ -26,4 +30,17 @@ class NavigationModule {
     fun provideNavigatorHolder(): NavigatorHolder {
         return cicerone.getNavigatorHolder()
     }
+
+    @Provides
+    @Singleton
+    fun provideGraphRouter(): GraphRouter {
+        return graphCicerone.router
+    }
+
+    @Provides
+    @Singleton
+    @Named("graph")
+    fun provideGraphNavigatorHolder(): NavigatorHolder {
+        return graphCicerone.getNavigatorHolder()
+    }
 }

sample/src/main/java/com/github/terrakok/cicerone/sample/mvp/animation/profile/ProfilePresenter.kt

@@ -1,5 +1,6 @@
 package com.github.terrakok.cicerone.sample.mvp.animation.profile
 
+import com.github.terrakok.cicerone.ResultListenerHandler
 import com.github.terrakok.cicerone.Router
 import com.github.terrakok.cicerone.sample.R
 import com.github.terrakok.cicerone.sample.Screens.SelectPhoto
@@ -13,6 +14,7 @@ import moxy.MvpPresenter
 class ProfilePresenter(
         private val router: Router
 ) : MvpPresenter<ProfileView>() {
+    private var resultListenerHandler: ResultListenerHandler? = null
 
     companion object {
         private const val RESULT_KEY = "photo_result"
@@ -25,12 +27,17 @@ class ProfilePresenter(
     }
 
     fun onPhotoClicked() {
-        router.setResultListener(RESULT_KEY) { data ->
+        resultListenerHandler = router.setResultListener(RESULT_KEY) { data ->
             viewState!!.showPhoto(data as Int)
         }
         router.navigateTo(SelectPhoto(RESULT_KEY))
     }
 
+    override fun onDestroy() {
+        resultListenerHandler?.dispose()
+        super.onDestroy()
+    }
+
     fun onBackPressed() {
         router.exit()
     }

sample/src/main/java/com/github/terrakok/cicerone/sample/mvp/graph/ForkPresenter.kt

@@ -0,0 +1,28 @@
+package com.github.terrakok.cicerone.sample.mvp.graph
+
+import com.github.terrakok.cicerone.graph.GraphRouter
+import moxy.InjectViewState
+import moxy.MvpPresenter
+import moxy.MvpView
+
+@InjectViewState
+class ForkPresenter(
+    private val graphRouter: GraphRouter
+): MvpPresenter<MvpView>() {
+
+    fun onTopButtonClick() {
+        graphRouter.currentVertex.edges.firstOrNull()?.id?.let { id ->
+            graphRouter.navigateTo(id)
+        }
+    }
+
+    fun onBottomButtonClick() {
+        graphRouter.currentVertex.edges.lastOrNull()?.id?.let { id ->
+            graphRouter.navigateTo(id)
+        }
+    }
+
+    fun onBackPressed() {
+        graphRouter.exit()
+    }
+}

sample/src/main/java/com/github/terrakok/cicerone/sample/mvp/graph/RoadPresenter.kt

@@ -0,0 +1,28 @@
+package com.github.terrakok.cicerone.sample.mvp.graph
+
+import com.github.terrakok.cicerone.graph.GraphRouter
+import moxy.InjectViewState
+import moxy.MvpPresenter
+import moxy.MvpView
+
+@InjectViewState
+class RoadPresenter(
+    private val graphRouter: GraphRouter
+): MvpPresenter<MvpView>() {
+
+    fun onButtonClick() {
+        graphRouter.currentVertex.edges.firstOrNull()?.id?.let { id ->
+            graphRouter.navigateTo(id)
+        }
+    }
+
+    fun onJumpClick() {
+        graphRouter.currentVertex.jumps.firstOrNull()?.id?.let { id ->
+            graphRouter.jumpTo(id)
+        }
+    }
+
+    fun onBackPressed() {
+        graphRouter.exit()
+    }
+}

sample/src/main/java/com/github/terrakok/cicerone/sample/mvp/start/StartActivityPresenter.kt

@@ -2,6 +2,7 @@ package com.github.terrakok.cicerone.sample.mvp.start
 
 import com.github.terrakok.cicerone.Router
 import com.github.terrakok.cicerone.sample.Screens.BottomNavigation
+import com.github.terrakok.cicerone.sample.Screens.Graph
 import com.github.terrakok.cicerone.sample.Screens.Main
 import com.github.terrakok.cicerone.sample.Screens.Profile
 import moxy.MvpPresenter
@@ -23,6 +24,10 @@ class StartActivityPresenter(private val router: Router) : MvpPresenter<StartAct
         router.navigateTo(Profile())
     }
 
+    fun onGraphPressed() {
+        router.navigateTo(Graph())
+    }
+
     fun onBackPressed() {
         router.exit()
     }

sample/src/main/java/com/github/terrakok/cicerone/sample/ui/animations/ProfileActivity.kt

@@ -46,7 +46,7 @@ class ProfileActivity : AppCompatActivity() {
         super.onPause()
     }
 
-    private val navigator: Navigator = object : AppNavigator(this, R.id.container, supportFragmentManager, supportFragmentManager.fragmentFactory) {
+    private val navigator: Navigator = object : AppNavigator(this, R.id.container) {
 
         override fun setupFragmentTransaction(fragmentTransaction: FragmentTransaction, currentFragment: Fragment?, nextFragment: Fragment?) {
             if (currentFragment is ProfileFragment

sample/src/main/java/com/github/terrakok/cicerone/sample/ui/bottom/BottomNavigationActivity.kt

@@ -87,7 +87,7 @@ class BottomNavigationActivity : MvpAppCompatActivity(), BottomNavigationView, R
         if (newFragment == null) {
             transaction.add(
                     R.id.ab_container,
-                    Tab(tab).createFragment.invoke(fm.fragmentFactory), tab
+                    Tab(tab).createFragment(fm.fragmentFactory), tab
             )
         }
         if (currentFragment != null) {

sample/src/main/java/com/github/terrakok/cicerone/sample/ui/bottom/TabContainerFragment.kt

@@ -23,7 +23,7 @@ import javax.inject.Inject
 class TabContainerFragment : Fragment(), RouterProvider, BackButtonListener {
 
     private val navigator: Navigator by lazy {
-        AppNavigator(activity!!, R.id.ftc_container, childFragmentManager, childFragmentManager.fragmentFactory)
+        AppNavigator(activity!!, R.id.ftc_container, childFragmentManager)
     }
 
     @Inject

sample/src/main/java/com/github/terrakok/cicerone/sample/ui/graph/ForkFragment.kt

@@ -0,0 +1,65 @@
+package com.github.terrakok.cicerone.sample.ui.graph
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import com.github.terrakok.cicerone.graph.GraphRouter
+import com.github.terrakok.cicerone.sample.SampleApplication
+import com.github.terrakok.cicerone.sample.databinding.FragmentForkBinding
+import com.github.terrakok.cicerone.sample.databinding.FragmentRoadBinding
+import com.github.terrakok.cicerone.sample.mvp.graph.ForkPresenter
+import com.github.terrakok.cicerone.sample.mvp.graph.RoadPresenter
+import com.github.terrakok.cicerone.sample.ui.common.BackButtonListener
+import moxy.MvpAppCompatFragment
+import moxy.MvpView
+import moxy.presenter.InjectPresenter
+import moxy.presenter.ProvidePresenter
+import javax.inject.Inject
+
+class ForkFragment : MvpAppCompatFragment(), MvpView, BackButtonListener {
+    lateinit var binding: FragmentForkBinding
+
+    @Inject
+    lateinit var graphRouter: GraphRouter
+
+    @InjectPresenter
+    lateinit var presenter: ForkPresenter
+
+    @ProvidePresenter
+    fun provideRoadPresenter(): ForkPresenter {
+        return ForkPresenter(graphRouter)
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        SampleApplication.INSTANCE.appComponent.inject(this)
+        super.onCreate(savedInstanceState)
+    }
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        binding = FragmentForkBinding.inflate(inflater)
+        return binding.root
+    }
+
+    override fun onActivityCreated(savedInstanceState: Bundle?) {
+        super.onActivityCreated(savedInstanceState)
+        binding.textView.text = arguments?.getString(EXTRA_NUMBER)
+        binding.topButton.setOnClickListener { presenter.onTopButtonClick() }
+        binding.bottomButton.setOnClickListener { presenter.onBottomButtonClick()}
+    }
+
+    override fun onBackPressed(): Boolean {
+        presenter.onBackPressed()
+        return true
+    }
+
+    companion object {
+        private const val EXTRA_NUMBER = "extra_number"
+
+        fun getNewInstance(number: String) = ForkFragment().apply {
+            arguments = Bundle().apply {
+                putString(EXTRA_NUMBER, number)
+            }
+        }
+    }
+}

sample/src/main/java/com/github/terrakok/cicerone/sample/ui/graph/GraphActivity.kt

@@ -0,0 +1,63 @@
+package com.github.terrakok.cicerone.sample.ui.graph
+
+import android.os.Bundle
+import android.transition.ChangeBounds
+import androidx.appcompat.app.AppCompatActivity
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentTransaction
+import com.github.terrakok.cicerone.Command
+import com.github.terrakok.cicerone.Navigator
+import com.github.terrakok.cicerone.NavigatorHolder
+import com.github.terrakok.cicerone.Replace
+import com.github.terrakok.cicerone.androidx.AppNavigator
+import com.github.terrakok.cicerone.graph.GraphRouter
+import com.github.terrakok.cicerone.sample.R
+import com.github.terrakok.cicerone.sample.SampleApplication
+import com.github.terrakok.cicerone.sample.Screens.ProfileInfo
+import com.github.terrakok.cicerone.sample.ui.animations.photos.SelectPhotoFragment
+import com.github.terrakok.cicerone.sample.ui.animations.profile.ProfileFragment
+import com.github.terrakok.cicerone.sample.ui.common.BackButtonListener
+import javax.inject.Inject
+import javax.inject.Named
+
+/**
+ * Created by Konstantin Tskhovrebov (aka @terrakok) on 14.07.17.
+ */
+class GraphActivity : AppCompatActivity() {
+
+    @Inject
+    @Named("graph")
+    lateinit var navigatorHolder: NavigatorHolder
+
+    @Inject
+    lateinit var graphRouter: GraphRouter
+
+    private val navigator = AppNavigator(this, R.id.container)
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        SampleApplication.INSTANCE.appComponent.inject(this)
+        super.onCreate(savedInstanceState)
+
+        setContentView(R.layout.activity_container)
+    }
+
+    override fun onResumeFragments() {
+        super.onResumeFragments()
+        navigatorHolder.setNavigator(navigator)
+    }
+
+    override fun onPause() {
+        navigatorHolder.removeNavigator()
+        super.onPause()
+    }
+
+    override fun onBackPressed() {
+        val fragment = supportFragmentManager.findFragmentById(R.id.container)
+        if (fragment != null && fragment is BackButtonListener
+                && (fragment as BackButtonListener).onBackPressed()) {
+            return
+        } else {
+            super.onBackPressed()
+        }
+    }
+}

sample/src/main/java/com/github/terrakok/cicerone/sample/ui/graph/RoadFragment.kt

@@ -0,0 +1,63 @@
+package com.github.terrakok.cicerone.sample.ui.graph
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import com.github.terrakok.cicerone.graph.GraphRouter
+import com.github.terrakok.cicerone.sample.SampleApplication
+import com.github.terrakok.cicerone.sample.databinding.FragmentRoadBinding
+import com.github.terrakok.cicerone.sample.mvp.graph.RoadPresenter
+import com.github.terrakok.cicerone.sample.ui.common.BackButtonListener
+import moxy.MvpAppCompatFragment
+import moxy.MvpView
+import moxy.presenter.InjectPresenter
+import moxy.presenter.ProvidePresenter
+import javax.inject.Inject
+
+class RoadFragment : MvpAppCompatFragment(), MvpView, BackButtonListener {
+    lateinit var binding: FragmentRoadBinding
+
+    @Inject
+    lateinit var graphRouter: GraphRouter
+
+    @InjectPresenter
+    lateinit var presenter: RoadPresenter
+
+    @ProvidePresenter
+    fun provideRoadPresenter(): RoadPresenter {
+        return RoadPresenter(graphRouter)
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        SampleApplication.INSTANCE.appComponent.inject(this)
+        super.onCreate(savedInstanceState)
+    }
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        binding = FragmentRoadBinding.inflate(inflater)
+        return binding.root
+    }
+
+    override fun onActivityCreated(savedInstanceState: Bundle?) {
+        super.onActivityCreated(savedInstanceState)
+        binding.textView.text = arguments?.getString(EXTRA_NUMBER)
+        binding.forwardButton.setOnClickListener { presenter.onButtonClick() }
+        binding.jumpButton.setOnClickListener { presenter.onJumpClick() }
+    }
+
+    override fun onBackPressed(): Boolean {
+        presenter.onBackPressed()
+        return true
+    }
+
+    companion object {
+        private const val EXTRA_NUMBER = "extra_number"
+
+        fun getNewInstance(number: String) = RoadFragment().apply {
+            arguments = Bundle().apply {
+                putString(EXTRA_NUMBER, number)
+            }
+        }
+    }
+}

sample/src/main/java/com/github/terrakok/cicerone/sample/ui/main/MainActivity.kt

@@ -31,7 +31,7 @@ class MainActivity : MvpAppCompatActivity(), ChainHolder {
     @Inject
     lateinit var navigatorHolder: NavigatorHolder
 
-    private val navigator: Navigator = object : AppNavigator(this, R.id.main_container, supportFragmentManager, supportFragmentManager.fragmentFactory) {
+    private val navigator: Navigator = object : AppNavigator(this, R.id.main_container) {
 
         override fun applyCommands(commands: Array<out Command>) {
             super.applyCommands(commands)

sample/src/main/java/com/github/terrakok/cicerone/sample/ui/start/StartActivity.kt

@@ -29,7 +29,7 @@ class StartActivity : MvpAppCompatActivity(), StartActivityView {
     @InjectPresenter
     lateinit var presenter: StartActivityPresenter
 
-    private val navigator: Navigator = AppNavigator(this, -1, supportFragmentManager, supportFragmentManager.fragmentFactory)
+    private val navigator: Navigator = AppNavigator(this, -1)
 
     @ProvidePresenter
     fun createStartActivityPresenter() = StartActivityPresenter(router)
@@ -52,6 +52,9 @@ class StartActivity : MvpAppCompatActivity(), StartActivityView {
         findViewById<View>(R.id.result_and_anim_button).setOnClickListener {
             presenter.onResultWithAnimationPressed()
         }
+        findViewById<View>(R.id.graph_button).setOnClickListener {
+            presenter.onGraphPressed()
+        }
     }
 
     override fun onResume() {

sample/src/main/res/layout/activity_start.xml

@@ -43,4 +43,11 @@
         android:layout_height="wrap_content"
         android:layout_margin="16dp"
         android:text="@string/result_and_anim_nav"/>
+
+    <Button
+        android:id="@+id/graph_button"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_margin="16dp"
+        android:text="@string/graph_nav"/>
 </LinearLayout>

sample/src/main/res/layout/fragment_fork.xml

@@ -0,0 +1,43 @@
+<?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="match_parent"
+              android:orientation="vertical">
+
+    <Space
+        android:layout_width="wrap_content"
+        android:layout_height="0dp"
+        android:layout_weight="1"/>
+
+    <TextView
+        android:id="@+id/textView"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:gravity="center"
+        android:padding="16dp"
+        android:textColor="@android:color/white"
+        android:textSize="13sp"/>
+
+    <Button
+        android:id="@+id/top_button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:minWidth="100dp"
+        android:text="➔"
+        android:textSize="20sp"/>
+
+    <Button
+        android:id="@+id/bottom_button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:minWidth="100dp"
+        android:text="➔"
+        android:textSize="20sp"/>
+
+    <Space
+        android:layout_width="wrap_content"
+        android:layout_height="0dp"
+        android:layout_weight="1"/>
+</LinearLayout>

sample/src/main/res/layout/fragment_road.xml

@@ -0,0 +1,43 @@
+<?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="match_parent"
+              android:orientation="vertical">
+
+    <Space
+        android:layout_width="wrap_content"
+        android:layout_height="0dp"
+        android:layout_weight="1"/>
+
+    <TextView
+        android:id="@+id/textView"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:gravity="center"
+        android:padding="16dp"
+        android:textColor="@android:color/white"
+        android:textSize="13sp"/>
+
+    <Button
+        android:id="@+id/forward_button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:minWidth="100dp"
+        android:text="➔"
+        android:textSize="20sp"/>
+
+    <Button
+        android:id="@+id/jump_button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:minWidth="100dp"
+        android:text="JUMP"
+        android:textSize="20sp"/>
+
+    <Space
+        android:layout_width="wrap_content"
+        android:layout_height="0dp"
+        android:layout_weight="1"/>
+</LinearLayout>

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

@@ -4,6 +4,7 @@
     <string name="ordinary_nav">Ordinary navigation</string>
     <string name="multi_nav">Multi navigation</string>
     <string name="result_and_anim_nav">Resulting and animation sample</string>
+    <string name="graph_nav">Navigation graph</string>
 
     <string name="tab_android">Android</string>
     <string name="tab_bug">Bug</string>