从RecyclerView.OnItemTouchListener传递MotionEvents到GestureDetectorCompat

Question

我有一个实现RecyclerView.OnItemTouchListener的片段。如何 仅 将ReclickerView
事件和单击和Long-click运动事件
传递给GestureDetectorCompat。这就是说，我只想处理单击和长按，其余事件应该由RecyclerView处理，因为它通常会发生。我该如何设置？

public class MyFragment extends Fragment implements RecyclerView.OnItemTouchListener,
        GestureDetector.OnGestureListener {

    protected RecyclerView recyclerView;
    protected RecyclerView.Adapter adapter;
    protected LinearLayoutManager layoutManager;
    private GestureDetectorCompat detector;

    public MyFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.myfrag, container, false);

        recyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerview);

        layoutManager = new LinearLayoutManager(getActivity());
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.addOnItemTouchListener(this);

        adapter = new MyAdapter(myData));
        recyclerView.setAdapter(adapter);
        return rootView;
    }


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

    @Override
    public void onShowPress(MotionEvent e) {

    }

    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        return false;
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        return false;
    }

    @Override
    public void onLongPress(MotionEvent e) {

    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        return false;
    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView recyclerView, MotionEvent event) {
        return false;
    }

    @Override
    public void onTouchEvent(RecyclerView recyclerView, MotionEvent event) {

    }
}

Answer 1

您必须GestureDetectorCompat在onCreateView()方法中进行初始化：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.myfrag, container, false);

    detector = new GestureDetectorCompat(getActivity(), new RecyclerViewOnGestureListener());

    recyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerview);

    layoutManager = new LinearLayoutManager(getActivity());
    recyclerView.setLayoutManager(layoutManager);
    recyclerView.addOnItemTouchListener(this);

    adapter = new MyAdapter(myData));
    recyclerView.setAdapter(adapter);
    return rootView;
}

RecyclerViewOnGestureListener是您自己的内部类扩展SimpleOnGestureListener（提供OnGestureListener方法的空实现）

private class RecyclerViewOnGestureListener extends SimpleOnGestureListener {

    @Override
    public boolean onSingleTapConfirmed(MotionEvent e) {
        View view = recyclerView.findChildViewUnder(e.getX(), e.getY());
        int position = recyclerView.getChildPosition(view);

        // handle single tap

        return super.onSingleTapConfirmed(e);
    }

    public void onLongPress(MotionEvent e) {
        View view = recyclerView.findChildViewUnder(e.getX(), e.getY());
        int position = recyclerView.getChildPosition(view);

        // handle long press

        super.onLongPress(e);
    }
}

现在看一行（来自onCreateView()方法）：

recyclerView.addOnItemTouchListener(this);

在我们的例子中，“ this” OnItemTouchListener包含两个我们需要实现的方法：

@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
    detector.onTouchEvent(e);
    return false;
}

@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}

这是这些方法的含义的解释：https
:
//developer.android.com/reference/android/support/v7/widget/RecyclerView.OnItemTouchListener.html

您只需要处理来自的单击和长按事件即可RecyclerView。