Changes

1. Declaration of a class which implements the GestureDetector.OnGestureListener interface including the required onFling(), onDown(), onScroll(), onShowPress, onSingleTapUp() and onLongPress() callback methods. Note that this can be either an entirely new class, or the enclosing activity class. In the event that double tap gesture detection is required, the class must also implement the GestureDetector.OnDoubleTapListener interface and include the corresponding onDoubleTap() method.

2. Creation of an instance of the Android GestureDetectorCompat class, passing through an instance of the class created in step 1 as an argument.

3. An optional call to the setOnDoubleTapListener() method of the GestureDetectorCompat instance to enable double tap detection if required.

4. Implementation of the onTouchEvent() callback method on the enclosing activity which, in turn, must call the onTouchEvent() method of the GestureDetectorCompat instance, passing through the current motion event object as an argument to the method.