如何解决ItemToucherHelper 不会在带有垂直 LinearLayoutManager 的 recyclerView 中滑动
我正在尝试将 itemtouchhelper 附加到我的 recyclerView 以实现滑动读取功能,我有 itemtouchhelper.Callback 的代码:
public class MessageCommentSwipeCallback extends itemtouchhelper.Callback {
private static final String TAG="MessageSwipeCallback";
private final MessageCommentAdapter adapter;
public MessageCommentSwipeCallback(MessageCommentAdapter adapter) {
this.adapter = adapter;
Log.i(TAG,"MessageCommentSwipeCallback: ");
}
@Override
public int getMovementFlags(@NonNull RecyclerView recyclerView,@NonNull RecyclerView.ViewHolder viewHolder) {
Log.i(TAG,"getMovementFlags: ");
int dragFlags = itemtouchhelper.UP | itemtouchhelper.DOWN; //允许上下的拖动
int swipeFlags = itemtouchhelper.LEFT; //只允许从右向左侧滑
return makeFlag(dragFlags,swipeFlags);
}
@Override
public boolean onMove(@NonNull RecyclerView recyclerView,@NonNull RecyclerView.ViewHolder viewHolder,@NonNull RecyclerView.ViewHolder target) {
return true;
}
@Override
public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder,int direction) {
Log.i(TAG,"onSwiped: ");
adapter.onMessageRead(viewHolder.getAbsoluteAdapterPosition());
}
@Override
public boolean isLongPressDragEnabled() {
return true;
}
@Override
public boolean isItemViewSwipeEnabled() {
Log.i(TAG,"isItemViewSwipeEnabled: ");
return true;
}
}
public class MessageCommentFragment extends Fragment {
private static final String TAG = "MessageCommentFragment";
private FragmentMessageCommentBinding binding;
private MessageCommentviewmodel messageCommentviewmodel;
private MessageCommentAdapter adapter;
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
binding = FragmentMessageCommentBinding.inflate(inflater);
//here omit unimportant code
binding.recyclerViewMessageComment.setLayoutManager(new linearlayoutmanager(getContext()));
return binding.getRoot();
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
//为recyclerView添加左滑监听
MessageCommentSwipeCallback callback=new MessageCommentSwipeCallback(adapter);
itemtouchhelper itemtouchhelper=new itemtouchhelper(callback);
itemtouchhelper.attachToRecyclerView(binding.recyclerViewMessageComment);
//here omit unimportant code
}
}
但是,即使我的 logcat 打印了有关“getMovementFlags”和“isItemViewSwipeEnabled”方法的信息,也没有滑动动画,也没有 logcat 信息对于方法“onSwiped”。这是 logcat 信息:
2021-04-01 11:14:55.922 15994-15994/com.cztcode.dailymoments I/MessageSwipeCallback: isItemViewSwipeEnabled:
2021-04-01 11:14:55.939 15994-15994/com.cztcode.dailymoments I/MessageSwipeCallback: isItemViewSwipeEnabled:
2021-04-01 11:14:55.939 15994-15994/com.cztcode.dailymoments I/MessageSwipeCallback: getMovementFlags:
2021-04-01 11:14:55.955 15994-15994/com.cztcode.dailymoments I/MessageSwipeCallback: isItemViewSwipeEnabled:
2021-04-01 11:14:55.955 15994-15994/com.cztcode.dailymoments I/MessageSwipeCallback: getMovementFlags:
2021-04-01 11:14:55.971 15994-15994/com.cztcode.dailymoments I/MessageSwipeCallback: isItemViewSwipeEnabled:
2021-04-01 11:14:55.971 15994-15994/com.cztcode.dailymoments I/MessageSwipeCallback: getMovementFlags:
2021-04-01 11:14:55.988 15994-15994/com.cztcode.dailymoments I/MessageSwipeCallback: isItemViewSwipeEnabled:
2021-04-01 11:14:55.988 15994-15994/com.cztcode.dailymoments I/MessageSwipeCallback: getMovementFlags:
我无法弄清楚发生了什么。请帮帮我。
解决方法
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