FirebaseUI-Android RecyclerView 不响应 POJO

Question

我的 Android FirebaseUI Recycler 视图对 String class 数据类型响应良好。但是当我使用我的 POJO class 作为数据类型时没有填充视图。

我已经花时间确保我的 POJO 中的名称与 JSON 文件中的名称匹配。以下是我的代码：

public class MainActivity extends AppCompatActivity   {
    public static class MessageViewHolder extends RecyclerView.ViewHolder {
        TextView messageTextView;

        public   MessageViewHolder(View view) {
            super(view);
            messageTextView =(TextView) messageTextView.findViewById(android.R.id.text1);

        }

    }

    android.support.v7.widget.RecyclerView recyclerView;

    FirebaseDatabase  database = FirebaseDatabase.getInstance();

    DatabaseReference myRef = database.getReference();

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

    @Override
    protected void onStart()
    {
        super.onStart();
        //Recycler
        recyclerView=(android.support.v7.widget.RecyclerView)findViewById(R.id.recyclerview);

        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        //Adapter
             FirebaseRecyclerAdapter<User, MessageViewHolder> mFirebaseAdapter=
                new FirebaseRecyclerAdapter<User, MessageViewHolder>(User.class,
                        R.layout.layout,
                        MessageViewHolder.class,
                        myRef.child("User")
                ) {
                    @Override
                    protected void populateViewHolder(MessageViewHolder viewHolder, User model, int position) {

                        viewHolder.messageTextView.setText(model.getName());
                    }
                };


        recyclerView.setAdapter(mFirebaseAdapter);


    }
}

POJO:

public class User {

   public User(){

    }
    String Name;
    String email;
   public User(String Name){

        this.Name=Name;

    }

    public void setName(String Name) {
        this.Name = Name;
    }

    public String getName() {
        return Name;
    }

}

来自 Firebase 的错误

Exception com.google.firebase.database.DatabaseException: Can't convert object of type java.lang.String to type com.projectgenuis.eneanews.User

编辑(JSON)

 {
  "User" : {
    "Name" : "Zion",

  }

Answer 1

FirebaseUI 适配器旨在显示项目列表，在您的例子中是用户列表。在您当前的数据模型中，/User 节点下只有一个用户。这意味着无法在列表视图中显示它。

解决此问题的最简单方法是将您的 JSON 更改为在 Users 节点下有一个用户列表：

{
  "Users" : {
    "User1": {
      "Name" : "Zion"
    }
    "User2": {
      "Name" : "puf"
    }
  }
}

然后将适配器附加到此集合：

mFirebaseAdapter= new FirebaseRecyclerAdapter<User, MessageViewHolder>(
                    User.class,
                    R.layout.layout,
                    MessageViewHolder.class,
                    myRef.child("Users")
            ) {

FirebaseUI-Android RecyclerView 不响应 POJO

FirebaseUI-Android RecyclerView Not Responding to POJO

android

json

android-recyclerview

firebase-realtime-database

firebaseui