ItemToucherHelper 不使用垂直 LinearLayoutManager 在 recyclerView 中滑动
ItemToucherHelper not swipe in recyclerView with vertical LinearLayoutManager
我正在尝试将 ItemTouchHelper 附加到我的 recyclerView 以实现滑动阅读功能,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;
}
}
我在这段代码中将它附加到 recyclerView:
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
}
}
然而,即使我的 logcat 打印了关于方法“getMovementFlags”和“isItemViewSwipeEnabled”的信息,那里没有滑动动画,方法“onSwiped”也没有 logcat 信息。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:
我想不通发生了什么。请帮助我。
您应该在 getMovementFlags 中使用 makeMovementFlags
而不是使用 makeFlags
。
您也可以使用我制作的库来执行此操作。
这是link
我正在尝试将 ItemTouchHelper 附加到我的 recyclerView 以实现滑动阅读功能,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;
}
}
我在这段代码中将它附加到 recyclerView:
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
}
}
然而,即使我的 logcat 打印了关于方法“getMovementFlags”和“isItemViewSwipeEnabled”的信息,那里没有滑动动画,方法“onSwiped”也没有 logcat 信息。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:
我想不通发生了什么。请帮助我。
您应该在 getMovementFlags 中使用 makeMovementFlags
而不是使用 makeFlags
。
您也可以使用我制作的库来执行此操作。
这是link