当你在创建阶段没有设置适配器时，会发生这种情况:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity);
    mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
    ....
}

public void onResume() {
    super.onResume();
    mRecyclerView.setAdapter(mAdapter);
    ....
}

只需移动设置适配器到onCreate与一个空数据，当你有数据调用:

mAdapter.notifyDataSetChanged();

这些行必须在OnCreate中:

mmAdapter = new Adapter(msgList);
mrecyclerView.setAdapter(mmAdapter);

我有这个错误，我试着修复了一段时间，直到我找到解决方案。

我做了一个私有方法buildRecyclerView，我调用它两次，第一次在onCreateView，然后在我的回调(其中我从API获取数据)。这是我的方法buildRecyclerView在我的片段:

private void buildRecyclerView(View v) {
        mRecyclerView = v.findViewById(R.id.recycler_view_loan);
        mLayoutManager = new LinearLayoutManager(getActivity());
        ((LinearLayoutManager) mLayoutManager).setOrientation(LinearLayoutManager.VERTICAL);
        mRecyclerView.setLayoutManager(mLayoutManager);
        mAdapter = new LoanAdapter(mExampleList);
        mRecyclerView.setLayoutManager(mLayoutManager);
        mRecyclerView.setAdapter(mAdapter);
}

此外，我必须修改我的适配器中的get-Item-Count方法，因为On - On - create - view列表是空的，它通过一个错误。所以，我的get-Item-Count如下所示:

@Override
    public int getItemCount() {
        try {
            return mLoanList.size();
        } catch (Exception ex){return 0;}

    }

首先初始化适配器

public void initializeComments(){
    comments = new ArrayList<>();

    comments_myRecyclerView = (RecyclerView) findViewById(R.id.comments_recycler);
    comments_mLayoutManager = new LinearLayoutManager(myContext);
    comments_myRecyclerView.setLayoutManager(comments_mLayoutManager);

    updateComments();
    getCommentsData();

}

public void updateComments(){

    comments_mAdapter = new CommentsAdapter(comments, myContext);
    comments_myRecyclerView.setAdapter(comments_mAdapter);
}

当数据集中发生变化时，只需调用updateComments方法。

如果你在使用ViewBinding时得到still错误，请确保你使用绑定来返回膨胀的视图

   @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    return fragmentBinding.getRoot();
}

解决方法是在底部设置初始化的空列表和适配器，并在获取结果时调用notifyDataSetChanged。

    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
    recyclerviewItems.setLayoutManager(linearLayoutManager);
    someAdapter = new SomeAdapter(getContext(),feedList);
    recyclerviewItems.setAdapter(someAdapter);