public void onGestureEnded(GestureOverlayView overlay, MotionEvent event) {
   mGesture = overlay.getGesture();
   if (mGesture.getLength() < LENGTH_THRESHOLD) {
     overlay.clear(false);
   }
   mDoneButton.setEnabled(true);
 }
	// 手势绘制完成时调用
	@Override
	public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {
		// TODO Auto-generated method stub
		
		mGesture = overlay.getGesture();
		if (mGesture != null) {
			// mButton1.setEnabled(true);
		}
	}