Android"从左向右滑动以删除",列表项上的手势,ICS样式

Question

我正在尝试在Android ICS及更高版本中实现"从左向右滑动以删除"手势.我的应用程序中有listview.我有手势探测器工作.但是当我在特定列表项目上从左向右滑动时,我希望项目随着我的手指移动.当我移动手指时,超过某一点,只有这样项目才会自行删除.OnFling()方法I目前还没有实现这一目标.

如何修改OnFling()方法以使项目随我的手指移动？

我的手势听众课是

class GestureListener extends SimpleOnGestureListener {
        private static final int SWIPE_MIN_DISTANCE = 50;
        private static final int SWIPE_MAX_OFF_PATH = 100;
        private static final int SWIPE_THRESHOLD_VELOCITY = 25;

        private MotionEvent mLastOnDownEvent = null;

        @Override
        public boolean onDown(MotionEvent e) {
            mLastOnDownEvent = e;
            return super.onDown(e);
        }

        @Override
        public boolean onSingleTapUp(MotionEvent e) {
            // TODO Auto-generated method stub
            Toast.makeText(getApplicationContext(), "On Single TAP up ", Toast.LENGTH_SHORT).show();
            return super.onSingleTapUp(e);
        }

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                float velocityY) {
            if (e1 == null) {
                e1 = mLastOnDownEvent;
            }
            if (e1 == null || e2 == null) {
                return false;
            }

            float dX = e2.getX() - e1.getX();
            float dY = e1.getY() - e2.getY();

            if (Math.abs(dY) < SWIPE_MAX_OFF_PATH
                    && Math.abs(velocityX) >= SWIPE_THRESHOLD_VELOCITY
                    && Math.abs(dX) >= SWIPE_MIN_DISTANCE) {
                if (dX > 0) {
                    int position = tasks.pointToPosition((int) e1.getX(),
                            (int) e1.getY());

                    int _id = (int) tasks.getItemIdAtPosition(position);
                    databaseConnector.deleteContact(_id);

                    new DeleteRow(_id, contactAdapter, getApplicationContext());
                contactAdapter.notifyDataSetChanged();


                    Toast.makeText(getApplicationContext(),
                            "Right Swipe" + _id, Toast.LENGTH_SHORT).show();
                } else {

                    Toast.makeText(getApplicationContext(), "Left Swipe",
                            Toast.LENGTH_SHORT).show();
                }
                return true;
            }

            return false;
        }

Answer 1

如果你想实现这种类型的功能,你应该看看Roman Nurik的轻扫以解除github上的片段.你可以在这里找到它.