仿微信朋友圈双击顶部回到最前端(GestureDetector.OnDoubleTapListener)

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public class MainActivity extends Activity implements OnTouchListener{

    private GestureDetector mGestureDetector;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


      mGestureDetector = new GestureDetector(new gestureListener()); //使用派生自OnGestureListener
      mGestureDetector.setOnDoubleTapListener(new doubleTapListener());

      TextView tv = (TextView)findViewById(R.id.tv);
      tv.setOnTouchListener(this);
      tv.setFocusable(true);
      tv.setClickable(true);
      tv.setLongClickable(true);
    }


    /*
     * 在onTouch()方法中，我们调用GestureDetector的onTouchEvent()方法，将捕捉到的MotionEvent交给GestureDetector
     * 来分析是否有合适的callback函数来处理用户的手势
     */
    public boolean onTouch(View v, MotionEvent event) {
        return mGestureDetector.onTouchEvent(event);
    }

    //OnGestureListener监听
    private class gestureListener implements GestureDetector.OnGestureListener{

        public boolean onDown(MotionEvent e) {
            Log.i("MyGesture", "onDown");
            Toast.makeText(MainActivity.this, "onDown", Toast.LENGTH_SHORT).show();
            return false;
        }

        public void onShowPress(MotionEvent e) {
            Log.i("MyGesture", "onShowPress");
            Toast.makeText(MainActivity.this, "onShowPress", Toast.LENGTH_SHORT).show();
        }

        public boolean onSingleTapUp(MotionEvent e) {
            Log.i("MyGesture", "onSingleTapUp");
            Toast.makeText(MainActivity.this, "onSingleTapUp", Toast.LENGTH_SHORT).show();
            return true;
        }

        public boolean onScroll(MotionEvent e1, MotionEvent e2,
                float distanceX, float distanceY) {
            Log.i("MyGesture22", "onScroll:"+(e2.getX()-e1.getX()) +"   "+distanceX);
            Toast.makeText(MainActivity.this, "onScroll", Toast.LENGTH_LONG).show();

            return true;
        }

        public void onLongPress(MotionEvent e) {
             Log.i("MyGesture", "onLongPress");
             Toast.makeText(MainActivity.this, "onLongPress", Toast.LENGTH_LONG).show();
        }

        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                float velocityY) {
            Log.i("MyGesture", "onFling");
            Toast.makeText(MainActivity.this, "onFling", Toast.LENGTH_LONG).show();
            return true;
        }
    };

    //OnDoubleTapListener监听
    private class doubleTapListener implements GestureDetector.OnDoubleTapListener{

        public boolean onSingleTapConfirmed(MotionEvent e) {
            Log.i("MyGesture", "onSingleTapConfirmed");
            Toast.makeText(MainActivity.this, "onSingleTapConfirmed", Toast.LENGTH_LONG).show();
            return true;
        }

        public boolean onDoubleTap(MotionEvent e) {
            Log.i("MyGesture", "onDoubleTap");
            Toast.makeText(MainActivity.this, "onDoubleTap", Toast.LENGTH_LONG).show();
            return true;
        }

        public boolean onDoubleTapEvent(MotionEvent e) {
            Log.i("MyGesture", "onDoubleTapEvent");
            Toast.makeText(MainActivity.this, "onDoubleTapEvent", Toast.LENGTH_LONG).show();
            return true;
        }
    };
}

参考： 

用户手势检测-GestureDetector使用详解