public class TouchLayout extends RelativeLayout {     public Handler doubleTapHandler = null;     protected long lastDown = -1;    public final static long DOUBLE_TIME = 500;      public TouchLayout(Context context) {      super(context);         }     public TouchLayout(Context context, AttributeSet attrs) {      super(context, attrs);         }     public TouchLayout(Context context, AttributeSet attrs, int defStyle) {      super(context, attrs, defStyle);         }         public boolean onTouchEvent(MotionEvent event) {       this.handleEvent(event);        if (event.getAction() == MotionEvent.ACTION_DOWN) {        long nowDown = System.currentTimeMillis();         if (nowDown - lastDown < DOUBLE_TIME)        {           if (doubleTapHandler != null)             doubleTapHandler.sendEmptyMessage(-1);         } else {          lastDown = nowDown;        }        }        return true;      }            protected void handleEvent(MotionEvent event) {       switch (event.getAction()) {      case MotionEvent.ACTION_DOWN:       //Do sth 這里處理即可        break;       case MotionEvent.ACTION_UP:        //Do sth        break;      }      }    }