ListFragment中的手势检测

时间:2012-10-03 17:08:49

标签: android android-listfragment gesturedetector

我有一个 ListFragment ,我使用ContentProvider填充。

我需要为每个人添加手势监听器,以便当用户向右滑动时,该项目将从列表中删除。

以下是我目前在ListFragment中的所有内容。

@Override
public void onListItemClick(ListView l, View v, int position, long id) {

 String selection = l.getItemAtPosition(position).toString();
 Toast.makeText(v.getContext(), selection + "", Toast.LENGTH_LONG).show();
 Log.d("TodoListFragment", selection+ "");

}

我如何附加手势检测和聆听?

我做了一些研究,发现了这段代码:

class MyGestureDetector extends SimpleOnGestureListener {
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        try {
            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                return false;
            // right to left swipe
            if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
               Log.d("Swipe", "Left");
            }  else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                Log.d("Swipe", "Right");
            }
        } catch (Exception e) {
            // nothing
        }
        return false;
    }

}

谁能告诉我如何实施它? (不是删除部分,而只是实现)

1 个答案:

答案 0 :(得分:3)

我使用以下答案解决了整个问题。

它完美无缺。

class SideIndexGestureListener extends GestureDetector.SimpleOnGestureListener {
        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {

            Log.d("Scrolled- fragment ", "Scrolling");
            return super.onScroll(e1, e2, distanceX, distanceY);
        }
    }




    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        final GestureDetector gestureDetector = new GestureDetector(getActivity(),
                new SideIndexGestureListener());
        View.OnTouchListener gestureListener = new View.OnTouchListener() {
            public boolean onTouch(View v, MotionEvent event) {
                return gestureDetector.onTouchEvent(event);
            }
        };
        getListView().setOnTouchListener(gestureListener);
        try {

           adapter = new ArrayAdapter<String>(getActivity(),
                    android.R.layout.simple_list_item_single_choice, elementos);
            setListAdapter(adapter);
            getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);

        }catch (Exception e){

        }