FirebaseRecyclerAdapter 数据库异常

Question

我为单个项目创建了一个模型类和布局，然后创建了视图持有人和 firebaseRecyclerAdapter 如下代码所示，当我运行时它给了我这个错误

        com.google.firebase.database.DatabaseException: Can't 
        convert object of type java.lang.String to type 
        com.best.karem.letsplay.Model.PsModel

我尝试添加 onValueEventListener，但它也不起作用

模型类

      public class PsModel {
private String title;
private String location;
private String thumb_image;

public PsModel(String title, String location, String thumb_image) {
    this.title = title;
    this.location = location;
    this.thumb_image = thumb_image;
}
public String getTitle() {
    return title;
}
public void setTitle(String title) {
    this.title = title;
}
public String getLocation() {
    return location;
}
public void setLocation(String location) {
    this.location = location;
}
public String getThumb_image() {
    return thumb_image;
}
public void setThumb_image(String thumb_image) {
    this.thumb_image = thumb_image;
}
public PsModel(){
}

}

主类

       public class Ps extends AppCompatActivity {
private Toolbar toolbar;
private FloatingActionButton psBtn;
private RecyclerView recyclerView;
private FirebaseAuth auth;
private DatabaseReference psRef;
private String currentUser;
private FirebaseRecyclerAdapter<PsModel , PsViewHolder> adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_ps);
    auth = FirebaseAuth.getInstance();
    currentUser = auth.getCurrentUser().getUid();
    psRef = FirebaseDatabase.getInstance().getReference().child("Posts").child(currentUser).child("Ps");

    recyclerView = findViewById(R.id.ps_recyclerview);
    recyclerView.setHasFixedSize(true);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));

    adapter = new FirebaseRecyclerAdapter<PsModel, PsViewHolder>(
            PsModel.class,
            R.layout.list_item,
            PsViewHolder.class,
            psRef
    ) {
        @Override
        protected void populateViewHolder(PsViewHolder viewHolder, PsModel model, int position) {

            viewHolder.itemTitle.setText(model.getTitle());
            viewHolder.itemLocation.setText(model.getLocation());
            Picasso.get().load(model.getThumb_image()).into(viewHolder.itemImage);
        }
    };
    recyclerView.setAdapter(adapter);
}

public static class PsViewHolder extends RecyclerView.ViewHolder{
    public ImageView itemImage;
    public TextView itemTitle , itemLocation;
    public PsViewHolder(@NonNull View itemView) {
        super(itemView);

        itemImage = itemView.findViewById(R.id.item_image);
        itemTitle = itemView.findViewById(R.id.item_title);
        itemLocation = itemView.findViewById(R.id.item_location);

    }
}

火碱数据结构图片

请不要向我推荐这个网站上的另一个答案，因为我搜索了 4 个小时并尝试了所有方法都没有奏效

Answer 1

你能检查一下psRef的内容吗？

我知道它以字符串的形式出现，并期望作为一个对象出现。

 psRef = FirebaseDatabase.getInstance().getReference().child("Posts").child(currentUser).child("Ps");