Migrate Nullable and NonNull annotations to AndroidX

Summary:
This diff migrates the usages Nullable and NonNull annotations to AndroidX instead of javax.

The purpose of this change is to bring consistency in the annotations used by the core of RN

Reviewed By: makovkastar

Differential Revision: D16054504

fbshipit-source-id: 21d888854da088d2a14615a90d4dc058e5286b91

ReactAndroid/src/androidTest/java/com/facebook/react/testing/AssertModule.java

@@ -9,9 +9,9 @@ package com.facebook.react.testing;
 import static junit.framework.Assert.assertFalse;
 import static junit.framework.Assert.assertTrue;
 
+import androidx.annotation.Nullable;
 import com.facebook.react.bridge.BaseJavaModule;
 import com.facebook.react.bridge.ReactMethod;
-import javax.annotation.Nullable;
 
 /** NativeModule for tests that allows assertions from JS to propagate to Java. */
 public class AssertModule extends BaseJavaModule {

ReactAndroid/src/androidTest/java/com/facebook/react/testing/FakeWebSocketModule.java

@@ -6,11 +6,11 @@
  */
 package com.facebook.react.testing;
 
+import androidx.annotation.Nullable;
 import com.facebook.react.bridge.BaseJavaModule;
 import com.facebook.react.bridge.ReactMethod;
 import com.facebook.react.bridge.ReadableArray;
 import com.facebook.react.bridge.ReadableMap;
-import javax.annotation.Nullable;
 
 /** Dummy implementation of storage module, used for testing */
 public final class FakeWebSocketModule extends BaseJavaModule {

ReactAndroid/src/androidTest/java/com/facebook/react/testing/ReactAppInstrumentationTestCase.java

@@ -11,12 +11,12 @@ import android.graphics.Bitmap;
 import android.test.ActivityInstrumentationTestCase2;
 import android.view.View;
 import android.view.ViewGroup;
+import androidx.annotation.Nullable;
 import com.facebook.infer.annotation.Assertions;
 import com.facebook.react.bridge.ReactContext;
 import com.facebook.react.testing.idledetection.IdleWaiter;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
-import javax.annotation.Nullable;
 
 /** Base class for instrumentation tests that runs React based react application in UI mode */
 public abstract class ReactAppInstrumentationTestCase

ReactAndroid/src/androidTest/java/com/facebook/react/testing/ReactAppTestActivity.java

@@ -14,6 +14,7 @@ import android.os.Bundle;
 import android.view.View;
 import android.view.ViewTreeObserver;
 import android.widget.FrameLayout;
+import androidx.annotation.Nullable;
 import androidx.fragment.app.FragmentActivity;
 import com.facebook.infer.annotation.Assertions;
 import com.facebook.react.ReactInstanceManager;
@@ -39,7 +40,6 @@ import java.util.Arrays;
 import java.util.List;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
-import javax.annotation.Nullable;
 
 public class ReactAppTestActivity extends FragmentActivity
     implements DefaultHardwareBackBtnHandler, PermissionAwareActivity {

ReactAndroid/src/androidTest/java/com/facebook/react/testing/ReactInstanceSpecForTest.java

@@ -7,6 +7,7 @@
 package com.facebook.react.testing;
 
 import android.annotation.SuppressLint;
+import androidx.annotation.Nullable;
 import com.facebook.react.ReactPackage;
 import com.facebook.react.bridge.JavaScriptExecutorFactory;
 import com.facebook.react.bridge.JavaScriptModule;
@@ -15,7 +16,6 @@ import com.facebook.react.uimanager.ViewManager;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
-import javax.annotation.Nullable;
 
 /**
  * A spec that allows a test to add additional NativeModules/JS modules to the ReactInstance. This

ReactAndroid/src/androidTest/java/com/facebook/react/testing/ReactInstrumentationTest.java

@@ -10,11 +10,11 @@ import android.content.Intent;
 import android.test.ActivityInstrumentationTestCase2;
 import android.view.View;
 import android.view.ViewGroup;
+import androidx.annotation.Nullable;
 import com.facebook.react.bridge.JavaScriptExecutorFactory;
 import com.facebook.react.bridge.JavaScriptModule;
 import com.facebook.react.bridge.ReactContext;
 import com.facebook.react.testing.idledetection.IdleWaiter;
-import javax.annotation.Nullable;
 
 /**
  * Base class for instrumentation tests that runs React based application.

ReactAndroid/src/androidTest/java/com/facebook/react/testing/ReactIntegrationTestCase.java

@@ -11,6 +11,7 @@ import static org.mockito.Mockito.mock;
 import android.test.AndroidTestCase;
 import android.view.View;
 import android.view.ViewGroup;
+import androidx.annotation.Nullable;
 import com.facebook.infer.annotation.Assertions;
 import com.facebook.react.bridge.BaseJavaModule;
 import com.facebook.react.bridge.CatalystInstance;
@@ -29,7 +30,6 @@ import com.facebook.soloader.SoLoader;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Semaphore;
 import java.util.concurrent.TimeUnit;
-import javax.annotation.Nullable;
 
 /**
  * Use this class for writing integration tests of catalyst. This class will run all JNI call within

ReactAndroid/src/androidTest/java/com/facebook/react/testing/ReactTestHelper.java

@@ -9,6 +9,7 @@ package com.facebook.react.testing;
 import android.content.Context;
 import android.view.View;
 import android.view.ViewGroup;
+import androidx.annotation.Nullable;
 import com.android.internal.util.Predicate;
 import com.facebook.infer.annotation.Assertions;
 import com.facebook.react.NativeModuleRegistryBuilder;
@@ -30,7 +31,6 @@ import com.facebook.react.uimanager.ViewManager;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
-import javax.annotation.Nullable;
 
 public class ReactTestHelper {
   private static class DefaultReactTestFactory implements ReactTestFactory {

ReactAndroid/src/androidTest/java/com/facebook/react/testing/ScreenshotingFrameLayout.java

@@ -11,7 +11,7 @@ import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.os.Looper;
 import android.widget.FrameLayout;
-import javax.annotation.Nullable;
+import androidx.annotation.Nullable;
 
 /**
  * A FrameLayout that allows you to access the result of the last time its hierarchy was drawn. It

ReactAndroid/src/androidTest/java/com/facebook/react/testing/network/NetworkRecordingModuleMock.java

@@ -6,6 +6,7 @@
  */
 package com.facebook.react.testing.network;
 
+import androidx.annotation.Nullable;
 import com.facebook.react.bridge.Arguments;
 import com.facebook.react.bridge.Callback;
 import com.facebook.react.bridge.ReactApplicationContext;
@@ -17,7 +18,6 @@ import com.facebook.react.bridge.WritableArray;
 import com.facebook.react.bridge.WritableMap;
 import com.facebook.react.module.annotations.ReactModule;
 import com.facebook.react.modules.core.DeviceEventManagerModule;
-import javax.annotation.Nullable;
 
 /**
  * Mock Networking module that records last request received by {@link #sendRequest} method and

ReactAndroid/src/androidTest/java/com/facebook/react/tests/CatalystSubviewsClippingTestCase.java

@@ -8,6 +8,7 @@ package com.facebook.react.tests;
 
 import android.content.Context;
 import android.widget.ScrollView;
+import androidx.annotation.Nullable;
 import com.facebook.react.bridge.JavaScriptModule;
 import com.facebook.react.testing.ReactAppInstrumentationTestCase;
 import com.facebook.react.testing.ReactInstanceSpecForTest;
@@ -18,7 +19,6 @@ import com.facebook.react.views.view.ReactViewGroup;
 import com.facebook.react.views.view.ReactViewManager;
 import java.util.ArrayList;
 import java.util.List;
-import javax.annotation.Nullable;
 import org.junit.Assert;
 
 /**