我有一个实现 RecyclerView.OnItemTouchListener 的 fragment 。如何将 仅单击和长按运动事件 从 RecyclerView 传递到 GestureDetectorCompat。也就是说,我只想处理点击和长按,其余事件应该由 RecyclerView 正常处理。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) {
}
}
最佳答案
您必须在 onCreateView()
方法中初始化 GestureDetectorCompat
:
@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
是您自己的扩展 SimpleOnGestureListener
的内部类(它提供了 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);
}
}
现在看行(来自 onCreateView()
方法):
recyclerView.addOnItemTouchListener(this);
在我们的例子中,“this”是 OnItemTouchListener
,其中包含我们需要实现的两个方法:
@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
detector.onTouchEvent(e);
return false;
}
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
这里解释一下这些方法的含义: https://developer.android.com/reference/android/support/v7/widget/RecyclerView.OnItemTouchListener.html
这就是处理来自 RecyclerView
的单击和长按事件所需的一切。
关于java - 将 MotionEvents 从 RecyclerView.OnItemTouchListener 传递到 GestureDetectorCompat,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26524003/