@Override
 public boolean onTouchEvent(MotionEvent event) {
  return super.onTouchEvent(event);
 }

public interface MyOnTouchListener {
  public boolean onTouch(MotionEvent ev);
 }

private ArrayList<MyOnTouchListener> onTouchListeners = new ArrayList<MyOnTouchListener>(
   10);

 @Override
 public boolean dispatchTouchEvent(MotionEvent ev) {
  for (MyOnTouchListener listener : onTouchListeners) {
   if(listener != null) {
    listener.onTouch(ev);
   }
  }
  return super.dispatchTouchEvent(ev);
 }
 public void registerMyOnTouchListener(MyOnTouchListener myOnTouchListener) {
  onTouchListeners.add(myOnTouchListener);
 }
 public void unregisterMyOnTouchListener(MyOnTouchListener myOnTouchListener) {
  onTouchListeners.remove(myOnTouchListener) ;
 }

  onTouchListener = new MusicActivity.MyOnTouchListener() {
   @Override
   public boolean onTouch(MotionEvent ev) {
    gestureDetector.onTouchEvent(ev);
    return false;
   }
  };
  ((MusicActivity) getActivity()).registerMyOnTouchListener(onTouchListener);