Question

错误我想再次发送该对象，我的代码想将其转换为String，请帮忙，错误是：

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

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：主要处理：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 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） at 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） at java.lang.reflect.Method.invoke（Native Method）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:728）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:618）

Answer 1

有同样的问题，你需要对第一个数据快照进行另一次内部迭代。试试这个..

 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*/
                    }
                }

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

1 个答案: