Question

我想将此GestureListener添加到我的recyclerview：

public class OnSwipeTouchListener implements OnTouchListener {

    private final GestureDetector gestureDetector;

    public OnSwipeTouchListener (Context ctx){
        gestureDetector = new GestureDetector(ctx, new GestureListener());
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        return gestureDetector.onTouchEvent(event);
    }

    private final class GestureListener extends SimpleOnGestureListener {

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

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

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            boolean result = false;
            try {
                float diffY = e2.getY() - e1.getY();
                float diffX = e2.getX() - e1.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();
                        }
                    }
                    result = true;
                }
                else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffY > 0) {
                        onSwipeBottom();
                    } else {
                        onSwipeTop();
                    }
                }
                result = true;

            } catch (Exception exception) {
                exception.printStackTrace();
            }
            return result;
        }
    }

    public void onSwipeRight() {
    }

    public void onSwipeLeft() {
    }

    public void onSwipeTop() {
    }

    public void onSwipeBottom() {
    }
}

但是如果我将这个touchlistener添加到我的recyclerview中，则滚动很糟糕。如果用户滚动并抬起手指，它不会进一步平滑滚动。如何添加此OnTouchListener并保持＆＃34;平滑滚动＆＃34;？

Answer 1

将touch事件分派给视图时，始终会调用onTouchListener's onTouch。所以尝试在onTouch()方法中添加此内容，您也可以使用event.getAction()上的开关，案例将MotionEvent.ACTION_UP，MotionEvent.ACTION_DOWN作为您的要求。

 if(event.getAction() == MotionEvent.ACTION_UP){

        // Do what you want
        return true;
    }
    return false;

Android：RecyclerView setOnTouchListener使滚动变坏

1 个答案: