检测要从列表视图中的滑动手势中删除的项目

Question

我如何从事件中检测并查看哪个项目被刷过，这样我就可以从 arrayList 中删除特定记录并将其从那里删除，然后更新适配器？

ArrayList<User> users = ... // list of user records

adapter = new ListAdapter(getActivity(), users);

ListView listView = getView().findViewById(R.id.listView);
listView.setAdapter(adapter);

listView.setOnTouchListener((view, event) -> { // for deletion
        return false;
});

一旦删除，适配器将被刷新。

adapter.notifyDataSetChanged();

编辑

private class ListAdapter extends ArrayAdapter<User> {

    public ListAdapter(Context context, ArrayList<User> users) {
        super(context, 0, users);
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup container) {
        if (convertView == null) {
            convertView = getLayoutInflater().inflate(android.R.layout.simple_list_item_1, container, false);
        }
        ((TextView) convertView.findViewById(android.R.id.text1)).setText(getItem(position).toString());
        return convertView;
    }
}

---

编辑 2

经过讨论，这是我的代码的样子，期待从这一点开始取得进展。

private class UserAdapter extends ArrayAdapter<User> {

    public UserAdapter(Context context, ArrayList<User> users) {
        super(context, 0, users);
    }

    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup container) {
        if (convertView == null) {
            convertView = getLayoutInflater().inflate(android.R.layout.simple_list_item_1, container, false);
        }
        ((TextView) convertView.findViewById(android.R.id.text1)).setText(getItem(position).toString());

        GestureDetector gestureDetector = new GestureDetector(this.getContext(), new GestureListener());

        convertView.setOnTouchListener(((view, event) -> {
            return gestureDetector.onTouchEvent(event);
        }));
        return convertView;
    }
}

private class GestureListener extends GestureDetector.SimpleOnGestureListener {

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

    @Override
    public boolean onSingleTapUp(MotionEvent motionEvent) {
        Log.d("abc", "onSingleTapUp: ");
        return false;
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityy) {
        float distanceX = e2.getX() - e1.getX();
        float distanceY = e2.getY() - e1.getY();
        if (Math.abs(distanceX) > Math.abs(distanceY) && Math.abs(distanceX) > SWIPE_DISTANCE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
            if (distanceX > 0)
                Log.d("abc", "onFling: swipe right");
            else
                Log.d("abc", "onFling: swipe left");
            return true;
        }
        return false;
    }
}

编辑 3

private class UserAdapter extends ArrayAdapter<User> {

    public UserAdapter(Context context, ArrayList<User> users) {
        super(context, 0, users);
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup container) {
        if (convertView == null) {
            convertView = getLayoutInflater().inflate(android.R.layout.simple_list_item_1, container, false);
        }
        ((TextView) convertView.findViewById(android.R.id.text1)).setText(getItem(position).toString());

        MyGestureDetector gestureDetector = new MyGestureDetector(this.getContext(), new GestureListener());
        convertView.setOnTouchListener(((view, event) -> gestureDetector.onTouchEvent(event)));

        return convertView;
    }
}

private class MyGestureDetector extends GestureDetector {

    public MyGestureDetector(Context context, OnGestureListener listener) {
        super(context, listener);
    }

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

Answer 1

我不确定处理手势或制作动画的“最佳实践”，但这至少可以让您获得被滑动的视图和位置

class GestureListener extends GestureDetector.SimpleOnGestureListener {
    private final int position;
    private View v;

    public GestureListener(int position, View v) {
        this.position = position;
        this.v = v;
    }

制作监听器时，传入数据

new GestureListener(position, convertView)

然后在 onFling 中，您可以访问视图和适配器位置，以便您至少可以记录它们，但是对 Arraylist 的访问会丢失并且在侦听器中执行视图动画我确定不是最好的想法，基于我在cmets中链接的库的源代码