Render top back and back button on search results

Differential Revision: D3238568

fb-gh-sync-id: d28eee4cefb88a4b43fd3c16357de3443aec6bc5
fbshipit-source-id: d28eee4cefb88a4b43fd3c16357de3443aec6bc5

ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java

@@ -57,6 +57,7 @@ public class ReactRootView extends SizeMonitoringFrameLayout implements RootView
   private @Nullable String mJSModuleName;
   private @Nullable Bundle mLaunchOptions;
   private @Nullable KeyboardListener mKeyboardListener;
+  private @Nullable OnGenericMotionListener mOnGenericMotionListener;
   private boolean mWasMeasured = false;
   private boolean mAttachScheduled = false;
   private boolean mIsAttachedToWindow = false;
@@ -121,6 +122,10 @@ public class ReactRootView extends SizeMonitoringFrameLayout implements RootView
     EventDispatcher eventDispatcher = reactContext.getNativeModule(UIManagerModule.class)
       .getEventDispatcher();
     mJSTouchDispatcher.onChildStartedNativeGesture(androidEvent, eventDispatcher);
+    // Hook for containers or fragments to get informed of the on touch events to perform actions.
+    if (mOnGenericMotionListener != null) {
+      mOnGenericMotionListener.onGenericMotion(this, androidEvent);
+    }
   }
 
   @Override
@@ -138,6 +143,10 @@ public class ReactRootView extends SizeMonitoringFrameLayout implements RootView
     return true;
   }
 
+  public void setOnGenericMotionListener(OnGenericMotionListener listener) {
+    mOnGenericMotionListener = listener;
+  }
+
   private void dispatchJSTouchEvent(MotionEvent event) {
     if (mReactInstanceManager == null || !mIsAttachedToInstance ||
       mReactInstanceManager.getCurrentReactContext() == null) {