notifyItemInserted或notifyItemRemoved中的RecycleView或更新

Question

我正在通过以下方式向RecyclerView插入值

public class UserListFragment extends Fragment implements UserEvents {


    private View rootView;
    private Activity mActivity;
    private RecyclerView recyclerView;
    ArrayList<User> mUserList;

    RoomOrUserRecyclerViewAdapter adapter;


    public static Fragment newInstance() {
        UserListFragment f = new UserListFragment();
        return f;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        rootView = inflater.inflate(R.layout.user_list_fragment, container, false);   
        findViews(rootView);
        return rootView;
    }

    private void findViews(View view) {

        recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
        mUserList = ((SocketApplication) mActivity.getApplication()).getUserListExcludeMineId();

        if (mUserList != null && mUserList.size() > 0) {

            adapter = new RoomOrUserRecyclerViewAdapter(getActivity(), mUserList, null);
            recyclerView.setAdapter(adapter);
        }

        ((SocketApplication) mActivity.getApplication()).setmUserEventsInterface(this);

    }


    @Override
    public void onAttach(Activity activity) {
        mActivity = activity;
        super.onAttach(activity);
    }

    @Override
    public void onUserLeft(int position) {
        if (position != -1) {
            adapter.notifyItemRemoved(position);
            adapter.notifyItemRangeChanged(position, mUserList.size());
        }
    }

    @Override
    public void onUserJoin(final User user) {
        mUserList.add(user);
        adapter.notifyItemInserted(mUserList.size() - 1);
    }
}

但该项目未插入或我在UI中未显示任何更新

有谁能帮我解决这个问题吗

当插入或删除任何新用户时，将执行此UserEvents接口的方法

 @Override
        public void onUserLeft(int position) {
            if (position != -1) {
                adapter.notifyItemRemoved(position);
                adapter.notifyItemRangeChanged(position, mUserList.size());
            }
        }

        @Override
        public void onUserJoin(final User user) {
            mUserList.add(user);
            adapter.notifyItemInserted(mUserList.size() - 1);
        }
    }

但不知道为什么回收器不更新

Answer 1

你能试试这个代码吗？我尝试这个代码我的项目和工作。

@Override
        public void onUserLeft(final int position) {
            if (position != -1) {
                        mUserList.remove(position);
                        adapter.notifyItemRangeChanged(position,1);
            }
        }

        @Override
        public void onUserJoin(final User user) {
                    mUserList.add(user);
                    adapter.notifyItemRangeChanged(mUserList.size()-1,1);
        }