Recyclerview 未更新新数据

嗨，大家好，

我有一个片段RecyclerView在里面。那RecyclerView由 Firebase 'DatabaseReference' 对象填充，并在该引用上添加了一个 ValueListener，如下所示：

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle
        savedInstanceState) {
    Log.d(TAG, "onCreateView");
    View view = inflater.inflate(R.layout.fragment_home, container, false);


   databaseReference.addValueEventListener(new ValueEventListener() {
               @Override
               public void onDataChange(DataSnapshot dataSnapshot) {
                   //Do something
               }

               @Override
               public void onCancelled(DatabaseError databaseError) {
                   // Getting Post failed, log a message
                   Log.w(TAG, "onCancelled", databaseError.toException());
               }
           });

         ItemRecyclerViewAdapter  adapter = new ItemRecyclerViewAdapter(activity, itemsDatabaseReference);
           adapter.setHasStableIds(true);
           // use a linear layout manager
          RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recyclerview);
           recyclerView.setHasFixedSize(true);
           RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity());
           recyclerView.setLayoutManager(layoutManager);
           DividerItemDecoration itemDecoration = new DividerItemDecoration(getContext(),
                   DividerItemDecoration.VERTICAL_LIST);
           recyclerView.addItemDecoration(itemDecoration);
           recyclerView.setAdapter(adapter);

    return view;
}

ItemRecyclerViewAdapter延伸FirebaseRecyclerAdapter。问题是onDataChange发生在之后onResume因此有时回收器是空的。我无法理解的是，回收者视图并不总是空的。有时显示数据，有时不显示数据。

Thanks

我想如果你正在使用FirebaseRecyclerAdapter（或由此扩展的任何课程）作为您的RecyclerView适配器，你应该设置recyclerView.setHasFixedSize(false)。所以recyclerView知道数据是不断更新的。