出现错误com.google.firebase.database.DatabaseException: Can't convert object of type java.lang.String to type

Question

错误我想再次发送对象并且我的代码想将其转换为String，请帮助，错误是：

com.google.firebase.database.DatabaseException：无法将 java.lang.String 类型的对象转换为 DetailRestaurant 类型

public class UploadImage extends AppCompatActivity {

FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef;
private EditText nameImageR;

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

    myRef = database.getReference("").child("users");
    nameImageR = findViewById(R.id.nameImageR);

    Button map = findViewById(R.id.buttonUpload);
    map.setOnClickListener(new View.OnClickListener() {
        @Override

        public void onClick(View view) {
            writeNewImage();
            Intent Client= new Intent(UploadImage.this, MainRestaurantActivity.class);
            startActivity(Client);
            finish();
        }
    });
}
private void writeNewImage() {
    myRef = database.getReference("users").child("restaurant").child(FirebaseAuth.getInstance().getCurrentUser().getUid());
    ValueEventListener valueEventListener = myRef.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot areaSnapshot : dataSnapshot.getChildren()) {
                DetailRestaurant value1 = areaSnapshot.getValue(DetailRestaurant.class);
                value1.setImageRestaurant(nameImageR.getText().toString());
                if (value1.getUid().equals(FirebaseAuth.getInstance().getCurrentUser().getUid())) {
                    String userIDR = value1.getUid();
                    myRef = database.getReference("");
                    myRef.child("users").child("restaurant").child(userIDR).setValue(value1);
                }
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            Log.d("Eror", "Something happened");
        }
    });
}
}

public class DetailRestaurant implements Serializable {

private String name;
private String uid;
private String ImageRestaurant;
private HashMap<String, DetailPlate> plates;

public DetailRestaurant(){
    this.plates = new HashMap<String, DetailPlate>();
}

public DetailRestaurant(String ImageRestaurant){
    this();
    this.ImageRestaurant = ImageRestaurant;
}

public DetailRestaurant(String name, String uid) {
    this();
    this.name = name;
    this.uid = uid;
}

public DetailRestaurant(String name, String uid, String ImageRestaurant, HashMap<String, DetailPlate> plates) {
    this.name = name;
    this.uid=uid;
    this.ImageRestaurant = ImageRestaurant;
    this.plates = plates;
}

public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getUid() {
    return uid;
}
public void setUid(String uid) {
    this.uid = uid;
}
public String getImageRestaurant() {
    return ImageRestaurant;
}
public void setImageRestaurant(String imageRestaurant) {
    ImageRestaurant = imageRestaurant;
}
public void setPlates(HashMap<String, DetailPlate> plates) {
    this.plates = plates;
}
public HashMap<String, DetailPlate> getPlates(){ return plates; }
public ArrayList<DetailPlate> getPlatesList() {
    ArrayList<DetailPlate> plates = new ArrayList<DetailPlate>();
    for (DetailPlate p : this.plates.values()){
        plates.add(p);
    }
    return plates;

}
@Override
public String toString() {
    return this.getName();
}

}

E/AndroidRuntime: 致命异常: main 进程：com.example.fernandalopezcardenas.uneatfinal，PID：9713 com.google.firebase.database.DatabaseException：无法将 java.lang.String 类型的对象转换为 com.example.fernandalopezcardenas.uneatfinal.Detail.DetailRestaurant 类型 在 com.google.android.gms.internal.zzbtg.zze（未知来源） 在 com.google.android.gms.internal.zzbtg.zzb（未知来源） 在 com.google.android.gms.internal.zzbtg.zza（未知来源） 在 com.google.firebase.database.DataSnapshot.getValue（未知来源） 在 com.example.fernandalopezcardenas.uneatfinal.Restaurant.UploadImage$2.onDataChange(UploadImage.java:56) 在 com.google.android.gms.internal.zzbpx.zza（未知来源） 在 com.google.android.gms.internal.zzbqx.zzZT（未知来源） 在 com.google.android.gms.internal.zzbra$1.run（未知来源） 在 android.os.Handler.handleCallback(Handler.java:746) 在 android.os.Handler.dispatchMessage(Handler.java:95) 在 android.os.Looper.loop(Looper.java:148) 在 android.app.ActivityThread.main(ActivityThread.java:5459) 在 java.lang.reflect.Method.invoke（本机方法） 在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728) 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)

Answer 1

遇到同样的问题，您需要对第一个数据快照进行另一次内部迭代。像这样试试..

 for (DataSnapshot areaSnapshotOne : dataSnapshot.getChildren())
                {
                    for (DataSnapshot areaSnapshotTwo : areaSnapshotOne.getChildren())
                    {
         DetailRestaurant value1 = areaSnapshotTwo.getValue(DetailRestaurant.class);
Log.d("details",value1.toString());

                          /*your rest code here*/
                    }
                }