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	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_hello_gesture);
		mGestureDetector = new GestureDetectorCompat(this, this);
		mGestureDetector.setOnDoubleTapListener(this);
	}
	
    @Override 
    public boolean onTouchEvent(MotionEvent event){ 
        this.mGestureDetector.onTouchEvent(event);
        // Be sure to call the superclass implementation
        return super.onTouchEvent(event);
    }