com.google.firebase.database.DatabaseException：无法将java.lang.String类型的对象转换为类型3

我遇到问题，无法解决。我想用幻灯片创建一个实时数据库，但是当我去这个活动时，系统停下来。我尝试了一切，但我无法解决这个问题。我是一个初学者，所以对我来说很难。请帮助..com.google.firebase.database.DatabaseException：无法将java.lang.String类型的对象转换为类型3

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

登录活动

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

<?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>

来源

2016-08-29 Storg

请指出哪儿你的应用程序崩溃，发生错误时，你可以检查logcat的，你可以按照[如何调试您的应用程序（HTTPS本指南：//开发商。 android.com/studio/debug/index.html） – Wilik

使你的应用和firebase中的模型相同 –

我确定。我确实检查了几次：@ – Storg

这可能来晚了，但解决问题的方法是通过将公共领域。如果您要将数据保存在Firebase上，请在您的方法中添加@Exclude。并添加@IgnoreExtraProperties：

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

    public AimToAim(){} 

    //... 

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

    //... 
}

来源

2016-11-16 12:57:33

com.google.firebase.database.DatabaseException：无法将java.lang.String类型的对象转换为类型3

回答

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