Android 手势检测

// First create the GestureListener that will include all our callbacks.
        // Then create the GestureDetector, which takes that listener as an argument.
        GestureDetector.SimpleOnGestureListener gestureListener = new GestureListener();
        final GestureDetector gd = new GestureDetector(getActivity(), gestureListener);

        /* For the view where gestures will occur, create an onTouchListener that sends
         * all motion events to the gesture detector.  When the gesture detector
         * actually detects an event, it will use the callbacks you created in the
         * SimpleOnGestureListener to alert your application.
        */

        gestureView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                gd.onTouchEvent(motionEvent);
                return false;
            }
        });