com.google.firebase.database.DatabaseException: Objekt vom Typ java.lang.String kann nicht in Typ 3 konvertiert werden

Question

Ich habe ein Problem, das ich nicht lösen kann. Ich möchte eine Echtzeit-Datenbank mit Firabase erstellen, aber wenn ich zu dieser Aktivität gehe, halte ich das System an. Ich habe alles versucht, aber ich kann dieses Problem nicht lösen. Ich bin ein Anfänger, also ist es schwierig für mich. Bitte helfen ..

09-01 08:57:57.018 2787-2787/sgtt.celtkituzes_0_1 E/AndroidRuntime: FATAL EXCEPTION: main 
                    Process: sgtt.celtkituzes_0_1, PID: 2787 
                    com.google.firebase.database.DatabaseException: Can't convert object of type java.lang.String to type sgtt.celtkituzes_0_1.AimToAim 
                     at com.google.android.gms.internal.zzaln.zzd(Unknown Source) 
                     at com.google.android.gms.internal.zzaln.zzb(Unknown Source) 
                     at com.google.android.gms.internal.zzaln.zza(Unknown Source) 
                     at com.google.firebase.database.DataSnapshot.getValue(Unknown Source) 
                     at com.firebase.ui.database.FirebaseRecyclerAdapter.parseSnapshot(FirebaseRecyclerAdapter.java:147) 
                     at com.firebase.ui.database.FirebaseRecyclerAdapter.getItem(FirebaseRecyclerAdapter.java:136) 
                     at com.firebase.ui.database.FirebaseRecyclerAdapter.onBindViewHolder(FirebaseRecyclerAdapter.java:176) 
                     at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5471) 
                     at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5504) 
                     at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4741) 
                     at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4617) 
                     at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1994) 
                     at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1390) 
                     at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1353) 
                     at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:549) 
                     at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3028) 
                     at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2906) 
                     at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3283) 
                     at android.view.View.layout(View.java:15671) 
                     at android.view.ViewGroup.layout(ViewGroup.java:5038) 
                     at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1076) 
                     at android.view.View.layout(View.java:15671) 
                     at android.view.ViewGroup.layout(ViewGroup.java:5038) 
                     at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579) 
                     at android.widget.FrameLayout.onLayout(FrameLayout.java:514) 
                     at android.view.View.layout(View.java:15671) 
                     at android.view.ViewGroup.layout(ViewGroup.java:5038) 
                     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703) 
                     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557) 
                     at android.widget.LinearLayout.onLayout(LinearLayout.java:1466) 
                     at android.view.View.layout(View.java:15671) 
                     at android.view.ViewGroup.layout(ViewGroup.java:5038) 
                     at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579) 
                     at android.widget.FrameLayout.onLayout(FrameLayout.java:514) 
                     at android.view.View.layout(View.java:15671) 
                     at android.view.ViewGroup.layout(ViewGroup.java:5038) 
                     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703) 
                     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557) 
                     at android.widget.LinearLayout.onLayout(LinearLayout.java:1466) 
                     at android.view.View.layout(View.java:15671) 
                     at android.view.ViewGroup.layout(ViewGroup.java:5038) 
                     at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579) 
                     at android.widget.FrameLayout.onLayout(FrameLayout.java:514) 
                     at android.view.View.layout(View.java:15671) 
                     at android.view.ViewGroup.layout(ViewGroup.java:5038) 
                     at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2086) 
                     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1843) 
                     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1061) 
                     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5885) 
                     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767) 
                     at android.view.Choreographer.doCallbacks(Choreographer.java:580) 
                     at android.view.Choreographer.doFrame(Choreographer.java:550) 
                     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753) 
                     at android.os.Handler.handleCallback(Handler.java:739) 
                     at android.os.Handler.dispatchMessage(Handler.java:95) 
                     at android.os.Looper.loop(Looper.java:135) 
                     at android 

Anmeldung Aktivität

package sgtt.celtkituzes_0_1; 

import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.content.IntentFilter; 
import android.content.SharedPreferences; 
import android.support.v4.content.LocalBroadcastManager; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.view.inputmethod.InputMethodManager; 
import android.widget.Button; 
import android.widget.CheckBox; 
import android.widget.EditText; 
import android.widget.TextView; 
import android.widget.Toast; 

import com.backendless.Backendless; 
import com.backendless.BackendlessUser; 
import com.backendless.async.callback.AsyncCallback; 
import com.backendless.exceptions.BackendlessFault; 
import com.google.android.gms.common.ConnectionResult; 
import com.google.android.gms.common.GooglePlayServicesUtil; 

public class LoginActivity extends AppCompatActivity { 

    public static final String APP_ID = "yyy"; 
    public static final String SECRET_KEY = "xxx"; 
    public static final String VERSION = "v1"; 

    // private BroadcastReceiver mRegistrationBroadcastReceiver; 

    private CheckBox saveLoginCheckBox; 
    private SharedPreferences loginPreferences; 
    private SharedPreferences.Editor loginPrefsEditor; 
    private Boolean saveLogin;  

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

     saveLoginCheckBox = (CheckBox)findViewById(R.id.checkBox); 
     loginPreferences = getSharedPreferences("loginPrefs", MODE_PRIVATE); 
     loginPrefsEditor = loginPreferences.edit(); 

     final EditText etEmail = (EditText) findViewById(R.id.etEmail); 
     final EditText etPassword = (EditText) findViewById(R.id.etPassword); 
     final Button bLogin = (Button) findViewById(R.id.bLogin); 
     final TextView registerLink = (TextView) findViewById(R.id.tvRegisterHere); 
     final TextView passwordLink = (TextView) findViewById(R.id.tvRePasswod);  

     saveLogin = loginPreferences.getBoolean("saveLogin", false); 
     if (saveLogin == true) { 
      etEmail.setText(loginPreferences.getString("email", "")); 
      etPassword.setText(loginPreferences.getString("password", "")); 
      saveLoginCheckBox.setChecked(true); 
     } 

    /*  mRegistrationBroadcastReceiver = new BroadcastReceiver() { 
      @Override 
      public void onReceive(Context context, Intent intent) { 
       if(intent.getAction().endsWith(GCMRegistrationIntentService.REGISTRATION_SUCCESS)){ 
        String token = intent.getStringExtra("token"); 
        Toast.makeText(getApplicationContext(), "GCM token:" + token, Toast.LENGTH_LONG).show(); 
       }else if(intent.getAction().equals(GCMRegistrationIntentService.REGISTRATION_ERROR)){ 
        Toast.makeText(getApplicationContext(), "GCM registration error!!", Toast.LENGTH_LONG).show(); 
       } 
      } 
     };*/ 

    /* //Check status on google play device 
     int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext()); 
     if(ConnectionResult.SUCCESS != resultCode){ 
      //Check type of error 
      if(GooglePlayServicesUtil.isUserRecoverableError(resultCode)){ 
       Toast.makeText(getApplicationContext(), "Google Play Service is not install/enabled in this device!", Toast.LENGTH_LONG).show(); 
       //So notification 
       GooglePlayServicesUtil.showErrorNotification(resultCode, getApplicationContext()); 
      }else{ 
       Toast.makeText(getApplicationContext(), "This device does not support for Google Play Service!", Toast.LENGTH_LONG).show(); 
      } 
     }else { 
      //Start service 
      Intent itent = new Intent(this, GCMRegistrationIntentService.class); 
      startService(itent); 
     }*/ 

     //regisztráció 
     registerLink.setOnClickListener(new View.OnClickListener(){ 
      @Override 
      public void onClick(View v) { 
       Intent registerIntent = new Intent(LoginActivity.this, RegisterActivity.class); 
       LoginActivity.this.startActivity(registerIntent); 
      } 
     }); 
     //jelszó emlékeztető 
     passwordLink.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       String mailforpsw = etEmail.getText().toString(); 
       Backendless.UserService.restorePassword(mailforpsw, new AsyncCallback<Void>() 
       { 
        public void handleResponse(Void response) 
        { 
         Toast.makeText(getApplicationContext(),"Az új jelszó elküldve a megadott email címre!", Toast.LENGTH_SHORT).show(); 
        } 

        public void handleFault(BackendlessFault fault) 
        { 
         Toast.makeText(getApplicationContext(),"Hiba!", Toast.LENGTH_SHORT).show(); 
        } 
       }); 
      } 
     }); 

     //bejelentkezés 
     bLogin.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View view) { 
       InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE); 
       imm.hideSoftInputFromWindow(etEmail.getWindowToken(), 0); 

       String email = etEmail.getText().toString(); 
       String password = etPassword.getText().toString(); 

       if (saveLoginCheckBox.isChecked()) { 
        loginPrefsEditor.putBoolean("saveLogin", true); 
        loginPrefsEditor.putString("email", email); 
        loginPrefsEditor.putString("password", password); 
        loginPrefsEditor.commit(); 
       } else { 
        loginPrefsEditor.clear(); 
        loginPrefsEditor.commit(); 
       } 

       Backendless.UserService.login(email, password, new AsyncCallback<BackendlessUser>() { 
        @Override 
        public void handleResponse(BackendlessUser response) { 
         Toast.makeText(getApplicationContext(),"Sikeres bejelentlezés",Toast.LENGTH_SHORT).show(); 

         Intent loginIntent = new Intent(LoginActivity.this, AimActivity.class); 
         LoginActivity.this.startActivity(loginIntent); 
        } 

        @Override 
        public void handleFault(BackendlessFault fault) { 
         Toast.makeText(getApplicationContext(),"Sikertelen bejelentlezés",Toast.LENGTH_SHORT).show(); 
        } 
       }); 
      } 
     }); 

     Backendless.initApp(this, APP_ID, SECRET_KEY, VERSION);  
    } 

    /*@Override 
    protected void onResume() { 
     super.onResume(); 
     Log.w("UserAreaActivity", "onResume"); 
     LocalBroadcastManager.getInstance(this).registerReceiver(mRegistrationBroadcastReceiver, new IntentFilter(GCMRegistrationIntentService.REGISTRATION_SUCCESS)); 
     LocalBroadcastManager.getInstance(this).registerReceiver(mRegistrationBroadcastReceiver, new IntentFilter(GCMRegistrationIntentService.REGISTRATION_ERROR)); 
    } 

    @Override 
    protected void onPause() { 
     super.onPause(); 
     Log.w("UserAreaActivity", "onPause"); 
     LocalBroadcastManager.getInstance(this).unregisterReceiver(mRegistrationBroadcastReceiver); 
    }*/ 
} 

AimActivity

package sgtt.celtkituzes_0_1; 

import android.support.annotation.NonNull; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.support.v7.widget.LinearLayoutManager; 
import android.support.v7.widget.RecyclerView; 
import android.view.View; 
import android.widget.TextView; 
import android.content.SharedPreferences; 

import com.firebase.ui.database.FirebaseRecyclerAdapter; 
import com.google.android.gms.common.ConnectionResult; 
import com.google.android.gms.common.api.GoogleApiClient; 
import com.google.firebase.database.DatabaseReference; 
import com.google.firebase.database.FirebaseDatabase; 

public class AimActivity extends AppCompatActivity implements 
     GoogleApiClient.OnConnectionFailedListener{ 

    public static class AimViewHolder extends RecyclerView.ViewHolder{ 
     public TextView aimName; 
     public TextView aimText; 
     public TextView aimUrl; 

     public AimViewHolder(View v){ 
      super(v); 
      aimName = (TextView)itemView.findViewById(R.id.name); 
      aimText = (TextView)itemView.findViewById(R.id.text); 
      aimUrl = (TextView)itemView.findViewById(R.id.url); 
     } 
    } 

    public static final String AIMS = "aims"; 
    private RecyclerView mAimRecyclerView; 
    private LinearLayoutManager mLinearLayoutManager; 

    public static DatabaseReference mFirebaseDatabaseReference; 
    private FirebaseRecyclerAdapter<AimToAim, AimViewHolder> mFirebaseAdapter; 

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

     mAimRecyclerView = (RecyclerView)findViewById(R.id.aimRecyclerView); 
     mLinearLayoutManager = new LinearLayoutManager(this); 
     mLinearLayoutManager.setStackFromEnd(true); 
     mAimRecyclerView.setLayoutManager(mLinearLayoutManager); 

     //Database Initialization 
     mFirebaseDatabaseReference = FirebaseDatabase.getInstance().getReference(); 
     mFirebaseAdapter = new FirebaseRecyclerAdapter<AimToAim, AimViewHolder>(
       AimToAim.class, 
       R.layout.activity_aim_to_aim, 
       AimViewHolder.class, 
       mFirebaseDatabaseReference.child(AIMS)) { 
      @Override 
      protected void populateViewHolder(AimViewHolder viewHolder, AimToAim model, int position) { 
       viewHolder.aimName.setText(model.getName()); 
       viewHolder.aimText.setText(model.getText()); 
       viewHolder.aimUrl.setText(model.getUrl()); 
      } 
     }; 

     mFirebaseAdapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver(){ 
      @Override 
      public void onItemRangeInserted(int positionStart, int itemCount){ 
       super.onItemRangeInserted(positionStart, itemCount); 
       int aimCount = mFirebaseAdapter.getItemCount(); 
       int lastVisiblePosition = mLinearLayoutManager.findLastCompletelyVisibleItemPosition(); 
       if (lastVisiblePosition == -1 || (positionStart >= (aimCount -1) && lastVisiblePosition == (positionStart -1))){ 
        mAimRecyclerView.scrollToPosition(positionStart); 
       } 
      } 
     }); 
     mAimRecyclerView.setLayoutManager(mLinearLayoutManager); 
     mAimRecyclerView.setAdapter(mFirebaseAdapter); 
    } 

    @Override 
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {  
    } 
} 

AimToAim

package sgtt.celtkituzes_0_1; 

/** 
* Created by Storg on 2016.08.27.. 
*/ 
public class AimToAim { 

    private String name; 
    private String text; 
    private String url; 

    public AimToAim(){ 
    } 
    public AimToAim(String name, String text, String url){ 
     this.name = name; 
     this.text = text; 
     this.url = url; 
    } 

    public String getName() { 
     return name; 
    } 

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

    public String getText() { 
     return text; 
    } 

    public void setText(String text) { 
     this.text = text; 
    } 

    public String getUrl() { 
     return url; 
    } 

    public void setUrl(String url) { 
     this.url = url; 
    } 
} 

activity_aim xml

012.351.

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="sgtt.celtkituzes_0_1.AimActivity"> 

    <android.support.v7.widget.RecyclerView 
     android:id="@+id/aimRecyclerView" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 

</RelativeLayout> 

AimToAim_xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="?android:attr/listPreferredItemHeightLarge"> 
    <TextView 
     android:id="@+id/name" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     tools:text="Name" 
     android:textAppearance="?android:attr/textAppearanceLarge" 
     android:paddingLeft="16dp"/> 
    <TextView 
     android:id="@+id/text" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     tools:text="Address" 
     android:textAppearance="?android:attr/textAppearanceMedium" 
     android:paddingLeft="16dp"/> 
    <TextView 
     android:id="@+id/url" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     tools:text="url" 
     android:textAppearance="?android:attr/textAppearanceMedium" 
     android:paddingLeft="16dp"/> 

</LinearLayout> 

Answer 1

Dies könnte zu spät kommen, aber die Lösung für Ihr Problem ist die Felder Öffentlichkeit, indem. Fügen Sie auch @Exclude zu Ihren Methoden hinzu, wenn Sie Daten auf der Firebase speichern. Und @IgnoreExtraProperties hinzufügen:

@IgnoreExtraProperties 
public class AimToAim { 
    public String name; 
    public String text; 
    public String url; 
    //... 

    public AimToAim(){} 

    //... 

    @Exclude  
    public String getName() { 
     return name; 
    } 

    //... 
}