@Override
  public synchronized boolean onDown(MotionEvent e) {
    final int size = mListeners.size();
    for (int i = 0; i < size; i++) {
      if (mListeners.get(i).onDown(e)) {
        return true;
      }
    }
    return false;
  }
Removes the given listener so that it will not be notified about future events.

<p>NOTE: The order of the listeners is important since gesture events can be consumed.

@param listener the listener to remove
samples/zoomable/src/main/java/com/facebook/samples/zoomable/MultiGestureListener.java