在Google Glass上捕获TWO_SWIPE_DOWN

Question

我想知道在使用GestureDetector时如何捕获Google Glass上的两个向下滑动事件。我似乎能够捕获所有其他事件，但不能捕获TWO_SWIPE_DOWN。看到下面的代码，似乎我的onGesture（）函数在这种情况下甚至没有调用 - 例如Log.e（）消息不会显示在LogCat for TWO_SIPE_DOWN中，但会显示所有其他情况

private GestureDetector createGestureDetector(Context context) {
    GestureDetector gestureDetector = new GestureDetector(context);
    //Create a base listener for generic gestures
    gestureDetector.setBaseListener( new GestureDetector.BaseListener() {
        @Override
        public boolean onGesture(Gesture gesture) {
            Log.e("Waveform", "gesture: " + gesture.toString());

            if (gesture == Gesture.TAP) {
                Log.e("WaveForm", "TAP");
                return true;
            } else if (gesture == Gesture.TWO_TAP) {
                Log.e("WaveForm", "TWO_TAP");
                return true;
            } else if (gesture == Gesture.SWIPE_RIGHT) {
                Log.e("WaveForm", "SWIPE_RIGHT");
                return true;
            } else if (gesture == Gesture.SWIPE_LEFT) {
                Log.e("WaveForm", "SWIPE_LEFT");
                return true;
            } else if (gesture == Gesture.SWIPE_UP) {
                Log.e("WaveForm", "SWIPE_UP");
                return true;
            } else if (gesture == Gesture.SWIPE_DOWN) {
                Log.e("WaveForm", "SWIPE_DOWN");
                return true;
            } else if (gesture == Gesture.TWO_SWIPE_DOWN) {
                Log.e("WaveForm", "TWO_SWIPE_DOWN");
                return true;
            }
            return false;
        }
    });
    gestureDetector.setFingerListener(new GestureDetector.FingerListener() {
        @Override
        public void onFingerCountChanged(int previousCount, int currentCount) {
          // do something on finger count changes
        }
    });
    gestureDetector.setScrollListener(new GestureDetector.ScrollListener() {
        @Override
        public boolean onScroll(float displacement, float delta, float velocity) {
            return false;
        }
    });
    return gestureDetector;
}