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我们将手势检测器添加到绿色视图中.@H_404_3@

MainActivity.java@H_404_3@

基本思想是在视图中添加OnTouchListener.通常我们会在这里获得所有原始触摸数据(如ACTION_DOWN,ACTION_MOVE,ACTION_UP等),但我们不会自己处理它,而是将其转发到手势检测器以对触摸数据进行解释.@H_404_3@

我们正在使用SimpleOnGestureListener.这个手势探测器的好处是我们只需要覆盖我们需要的手势.在这里的例子中,我包含了很多.您可以删除不需要的那些. (你应该总是在onDown()中返回true.返回true表示我们正在处理事件.返回false将使系统停止向我们提供更多触摸事件.)@H_404_3@

public class MainActivity extends AppCompatActivity {

    private GestureDetector mDetector;

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

        // this is the view we will add the gesture detector to
        View myView = findViewById(R.id.my_view);

        // get the gesture detector
        mDetector = new GestureDetector(this,new MyGestureListener());

        // Add a touch listener to the view
        // The touch listener passes all its events on to the gesture detector
        myView.setOnTouchListener(touchListener);
    }

    // This touch listener passes everything on to the gesture detector.
    // That saves us the trouble of interpreting the raw touch events 
    // ourselves.
    View.OnTouchListener touchListener = new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v,MotionEvent event) {
            // pass the events to the gesture detector
            // a return value of true means the detector is handling it
            // a return value of false means the detector didn't 
            // recognize the event
            return mDetector.onTouchEvent(event);

        }
    };

    // In the SimpleOnGestureListener subclass you should override 
    // onDown and any other gesture that you want to detect.
    class MyGestureListener extends GestureDetector.SimpleOnGestureListener {

        @Override
        public boolean onDown(MotionEvent event) {
            Log.d("TAG","onDown: ");

            // don't return false here or else none of the other 
            // gestures will work
            return true;
        }

        @Override
        public boolean onSingleTapConfirmed(MotionEvent e) {
            Log.i("TAG","onSingleTapConfirmed: ");
            return true;
        }

        @Override
        public void onLongPress(MotionEvent e) {
            Log.i("TAG","onLongPress: ");
        }

        @Override
        public boolean onDoubleTap(MotionEvent e) {
            Log.i("TAG","onDoubleTap: ");
            return true;
        }

        @Override
        public boolean onScroll(MotionEvent e1,MotionEvent e2,float distanceX,float distanceY) {
            Log.i("TAG","onScroll: ");
            return true;
        }

        @Override
        public boolean onFling(MotionEvent event1,MotionEvent event2,float velocityX,float velocityY) {
            Log.d("TAG","onFling: ");
            return true;
        }
    }
}

这是一个快速设置来运行这个项目,所以我建议你试一试.请注意日志事件的发生方式和时间.@H_404_3@