FirestoreRecyclerOptions 没有在 recyclerview 中检索到文档

Question

我使用了以下依赖项 firestore:12.0.1 firebase-ui-firestore:3.3.0

代码编译没有任何错误，应用程序运行良好，但 recyclerview 没有填充数据。 我以前多次使用过类似的代码，但到目前为止从未遇到任何问题。 firebase-ui 可能是原因吗？任何帮助表示赞赏。

public class ChatActivity extends AppCompatActivity implements View.OnClickListener {

    private RecyclerView messageList;

    FirebaseFirestore fireShop = FirebaseFirestore.getInstance();
    private FirestoreRecyclerAdapter firestoreRecyclerAdapter;
    private FirebaseAuth firebaseAuth;
    private ImageButton imageButton;
    private EditText editText;

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

        firebaseAuth = FirebaseAuth.getInstance();
        imageButton = (ImageButton) findViewById(R.id.button_chatbox_send);
        editText = (EditText) findViewById(R.id.edittext_chatbox) ;
        imageButton.setOnClickListener(this);


            messageList = (RecyclerView) findViewById(R.id.reyclerview_message_list);
            messageList.setHasFixedSize(true);
            messageList.setLayoutManager(new LinearLayoutManager(this));
            fetchData();




    }
    public class MessageViewHolder extends RecyclerView.ViewHolder{
        View mView;

        public MessageViewHolder(View itemView) {
            super(itemView);
            mView=itemView;
        }
        public void setMess(String messs){

            TextView messageView = (TextView) mView.findViewById(R.id.text_message_body);
            messageView.setText(messs);
        }

    }


    @Override
    public void onClick(View v) {
        if (v == imageButton){
            addData();

        }
    }
    public void fetchData( ){


        Query query=fireShop.collection("chat");
        Log.d("SGGGGG",query.toString());

        FirestoreRecyclerOptions<MessageDetails> details = new FirestoreRecyclerOptions.Builder<MessageDetails>()
                .setQuery(query,MessageDetails.class)
                .build();
        Log.d("ffffffffffFFRRRRRRRRRG",details.getSnapshots().toString());
        firestoreRecyclerAdapter = new FirestoreRecyclerAdapter<MessageDetails, MessageViewHolder>(details) {

            @Override
            protected void onBindViewHolder(@NonNull MessageViewHolder holder, int position, @NonNull MessageDetails model) {
                Log.d("FFFFFFFFFFFRRRRRRRRRG",model.getMessage());

                holder.setMess(model.getMessage());


            }

            @Override
            public MessageViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
                View view = LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.item_message_sent,parent,false);
                return new MessageViewHolder(view);
            }

            @Override
            public void onError(FirebaseFirestoreException e) {
                Log.e("error", e.getMessage());
            }


        };
        messageList.setAdapter(firestoreRecyclerAdapter);

        firestoreRecyclerAdapter.notifyDataSetChanged();




    }

   @Override
    public void onStop() {
        super.onStop();
        firestoreRecyclerAdapter.stopListening();
    }
    @Override
    public void onStart() {
        super.onStart();
        firestoreRecyclerAdapter.startListening();
    }



}

Data Screenshot

安全规则

service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if request.auth.uid != null;
    }
  }
}

Answer 1

如果您没有使用任何登录方法，例如any of these，那么您必须在test mode 中使用firestore，如果您在lock mode 中使用Firestore，那么您的用户必须使用登录方法进行身份验证（如上面的链接）从firestore访问数据。

只需将您的安全规则更改为

service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write;
    }
  }
}

然后再试一次。

Answer 2

你需要为MessageDetails.class创建一个空的构造函数

刚刚遇到了类似的问题，通过为主对象的类创建一个空的构造函数来解决它。