在网格视图上实施滑动手势 [英] Implement the swipe gesture on grid view

问题描述

我想在 GridView 上实施滑动手势。例如：
：我有3张3格 GridView 9张图片，当我将手指滑动到图片时，我想删除图片
可以帮助我，如果有的话任何想法。

谢谢

解决方案

这就是例子，在我身上

  public class GameActivity扩展AppCompatActivity {
 
 private GestureDetectorCompat检测器; 
 
 @Override 
 protected void onCreate（Bundle savedInstanceState）{
 super.onCreate（savedInstanceState）; 
 setContentView（R.layout.activity_game）; 
 
 detector = new GestureDetectorCompat（this，new MyGestureListener（））; 
 
 GridView board =（GridView）findViewById（R.id.board）; 
 board.setOnTouchListener（new View.OnTouchListener（）{
 @Override 
 public boolean onTouch（View v，MotionEvent event）{
 detector.onTouchEvent（event）; 
返回false; 
} 
}）; 
} 
 
 @Override 
 public boolean onTouchEvent（MotionEvent event）{
 detector.onTouchEvent（event）; 
返回super.onTouchEvent（event）; 
} 
 
 class MyGestureListener继承了GestureDetector.SimpleOnGestureListener {
 
 private static final int SWIPE_THRESHOLD = 100; 
 private static final int SWIPE_VELOCITY_THRESHOLD = 100; 
 
 @Override 
 public boolean onDown（MotionEvent event）{
 return true; 
 
 $ b @Override 
 public boolean onFling（MotionEvent event1，MotionEvent event2，
 float velocityX，float velocityY）{
 
 float diffY = event2.getY（） -  event1.getY（）; 
 float diffX = event2.getX（） -  event1.getX（）; （Math.abs（diffX）> Math.abs（diffY））{
 if（Math.abs（diffX）> SWIPE_THRESHOLD&& Math.abs（velocityX）> SWIPE_VELOCITY_THRESHOLD ）{
 if（diffX> 0）{
 onSwipeRight（）; 
} else {
 onSwipeLeft（）; 
} 
} 
} else {
 if（Math.abs（diffY）> SWIPE_THRESHOLD&& Math.abs（velocityY）> SWIPE_VELOCITY_THRESHOLD）{
 if（diffY> 0）{
 onSwipeBottom（）; 
} else {
 onSwipeTop（）; 
} 
} 
} 
返回true; 
 
 
 
 private void onSwipeLeft（）{
 
} 
 
 private void onSwipeRight（）{
）b 
 
 $ b private void onSwipeTop（）{
 
} 
 
 private void onSwipeBottom（）{
 
} 
} 
  

i want to implement the swipe gesture on GridView . for example: i have 3*3 GridView with 9 images when i swipe my finger to the images i want to delete the images that swiped can somebody help me if you have any idea.

Thanks

解决方案

This is example, that work on me

public class GameActivity extends AppCompatActivity {

    private GestureDetectorCompat detector;

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

        detector = new GestureDetectorCompat(this, new MyGestureListener());

        GridView board = (GridView) findViewById(R.id.board);
        board.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                detector.onTouchEvent(event);
                return false;
            }
        });
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        detector.onTouchEvent(event);
        return super.onTouchEvent(event);
    }

    class MyGestureListener extends GestureDetector.SimpleOnGestureListener {

        private static final int SWIPE_THRESHOLD = 100;
        private static final int SWIPE_VELOCITY_THRESHOLD = 100;

        @Override
        public boolean onDown(MotionEvent event) {
            return true;
        }

        @Override
        public boolean onFling(MotionEvent event1, MotionEvent event2,
                               float velocityX, float velocityY) {

            float diffY = event2.getY() - event1.getY();
            float diffX = event2.getX() - event1.getX();
            if (Math.abs(diffX) > Math.abs(diffY)) {
                if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffX > 0) {
                        onSwipeRight();
                    } else {
                        onSwipeLeft();
                    }
                }
            } else {
                if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffY > 0) {
                        onSwipeBottom();
                    } else {
                        onSwipeTop();
                    }
                }
            }
            return true;
        }        
    }

    private void onSwipeLeft() {

    }

    private void onSwipeRight() {

    }

    private void onSwipeTop() {

    }

    private void onSwipeBottom() {

    }
}

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