小编Ash*_*ade的帖子

我收到 Firebase UI 回收器视图的异常错误。我还包含了错误附件。这是 Firebase Recycler 视图。我在哪里使用 firebase 回收器适配器。每当我访问用户活动时，它都会崩溃，并在 logcat 中出现异常错误。请帮忙。这是我的代码：

private Toolbar mToolbar;
private RecyclerView mUsersList;

private DatabaseReference AllUsersRef;
private FirebaseAuth mAuth;
String currentUserID;
private Query query;

private FirebaseRecyclerOptions<Users> options;
private FirebaseRecyclerAdapter<Users, UsersViewHolder> adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_users);


    AllUsersRef = FirebaseDatabase.getInstance().getReference().child("users");

    mToolbar = findViewById(R.id.users_app_bar);
    setSupportActionBar(mToolbar);
    getSupportActionBar().setTitle("All Users");
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    mUsersList = findViewById(R.id.users_list);
    mUsersList.setHasFixedSize(true);
    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
    mUsersList.setLayoutManager(linearLayoutManager);

}

@Override
protected void onStart() {
    super.onStart();

    AllUsersRef.child("online").setValue(true);

    options = new FirebaseRecyclerOptions.Builder<Users>().setQuery(AllUsersRef, Users.class).build();

    adapter = new FirebaseRecyclerAdapter<Users, …