Firebase（Android）：Transaction.success（mutableData）によりアプリケーションがクラッシュする

Question

Firebaseのトランザクションを使用して、チャタップ（アンドロイド）の未読メッセージ数を増やす関数を作成しようとしています。

メンバーリストは、実際に私が後で拡大していき、グループチャットのための2人の以上のユーザーを含めることができますように

私のデータベース構造が見えます。

現在、メッセージは、messageListに私は、同様の送信者以外のすべてのユーザーに対してunreadCountを増やしたいmessageListに追加した後に追加することができます。これが私のincrementUnreadCountコードであるように、トランザクションをアトミックにする必要があることに気付きました。

private static void incrementUnreadCount(String chatRoomId) { 

    DatabaseReference mDatabaseMemberList = mDatabaseChatRooms.child(chatRoomId).child("memberList"); 

    mDatabaseMemberList.runTransaction(new Transaction.Handler() { 
     @Override 
     public Transaction.Result doTransaction(MutableData mutableData) { 

      Map<String, Map<String, Object>> tempMemberList = (Map<String, Map<String, Object>>) mutableData.getValue(); 

      if (tempMemberList == null) { 
       return Transaction.abort(); 
      } 

      for (String key : tempMemberList.keySet()) { 
       // if it is not a sender node 
       if (!key.equals(TutUserManager.getCurrentUid())) { 
        Map<String, Object> tempMap = tempMemberList.get(key); 
        long tempCount = (long) tempMap.get("unreadCount"); 
        tempCount += 1; 
        tempMap.put("unreadCount", tempCount); 
        tempMemberList.put(key, tempMap); 
       } 
      } 

      mutableData.setValue(tempMemberList); 
      return Transaction.success(mutableData); 
     } 

     @Override 
     public void onComplete(DatabaseError databaseError, boolean b, DataSnapshot dataSnapshot) { 

     } 
    }); 
} 

次のコードは、2番目のメッセージを送信した場合にのみ機能します。したがって、unreadCountの値は、予想される値よりも1少ない値になります。

私は、ドキュメントを読んで、ヌルの場合のためにそれをすることになっていることに気づい：

return Transaction.success(mutableData); 

及びません：アボートとして

return Transaction.abort(); 

（）サーバーの代わりにトランザクションをアボートようになりますもう一度取引をしようとしています。

return ransaction.success(mutableData);を使用するように上記コードを変更しようとしましたが、その関数を呼び出すとアプリケーションがクラッシュします。

私は何かを見逃しましたか？

これは私がコンソールから得るものです：

11/14 23:19:25: Launching app 
No apk changes detected since last installation, skipping installation of C:\Users\Potcharaphol\AndroidStudioProjects\Tut\app\build\outputs\apk\app-debug.apk 
$ adb shell am force-stop com.pchatanan.tut 
$ adb shell am start -n "com.pchatanan.tut/com.pchatanan.tut.MainActivities.GetStartedActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER -D 
Waiting for application to come online: com.pchatanan.tut.test | com.pchatanan.tut 
Connecting to com.pchatanan.tut 
E/HAL: load: id=gralloc != hmi->id=gralloc 
I/System.out: Sending WAIT chunk 
I/art: Debugger is active 
I/System.out: Debugger has connected 
I/System.out: waiting for debugger to settle... 
Connected to the target VM, address: 'localhost:8600', transport: 'socket' 
I/System.out: waiting for debugger to settle... 
I/System.out: waiting for debugger to settle... 
I/System.out: waiting for debugger to settle... 
I/System.out: waiting for debugger to settle... 
I/System.out: waiting for debugger to settle... 
I/System.out: waiting for debugger to settle... 
I/System.out: debugger has settled (1339) 
I/InstantRun: Instant Run Runtime started. Android package is com.pchatanan.tut, real application class is null. 

       [ 11-14 23:19:29.241 2931: 2931 E/   ] 
       process stopped due to unexpected signal 13 
W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found. 
W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found. 

        [ 11-14 23:19:29.819 2931: 2931 E/   ] 
        process stopped due to unexpected signal 13 
I/FA: App measurement is starting up, version: 9877 
I/FA: To enable debug logging run: adb shell setprop log.tag.FA VERBOSE 
I/FA: To enable faster debug mode event logging run: 
     adb shell setprop firebase.analytics.debug-mode com.pchatanan.tut 
I/HwCust: Constructor found for class android.app.HwCustAlarmManagerImpl 
I/FirebaseInitProvider: FirebaseApp initialization successful 
I/HwCust: Constructor found for class android.app.HwCustHwWallpaperManagerImpl 
W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable 

     [ 11-14 23:19:30.422 2931: 2931 E/   ] 
     process stopped due to unexpected signal 13 
I/AppCompatViewInflater: app:theme is now deprecated. Please move to using android:theme instead. 
I/HwSecImmHelper: mSecurityInputMethodService is null 
W/ActionBarDrawerToggle: DrawerToggle may not show up because NavigationIcon is not visible. You may need to call actionbar.setDisplayHomeAsUpEnabled(true); 
I/DynamiteModule: Considering local module com.google.android.gms.firebase_database:4 and remote module com.google.android.gms.firebase_database:4 
I/DynamiteModule: Selected remote version of com.google.android.gms.firebase_database, version >= 4 
W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_chimera/m/00000018/n/arm64-v8a 

      [ 11-14 23:19:31.068 2931: 2931 E/   ] 
      process stopped due to unexpected signal 13 
E/HAL: load: id=gralloc != hmi->id=gralloc 
I/OpenGLRenderer: Initialized EGL, version 1.4 
I/System: core_booster, getBoosterConfig = false 
I/System: core_booster, getBoosterConfig = false 

      [ 11-14 23:19:33.493 2931: 2931 E/   ] 
      process stopped due to unexpected signal 13 
W/Settings: Setting airplane_mode_on has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value. 
I/System: core_booster, getBoosterConfig = false 
I/System: core_booster, getBoosterConfig = false 

      [ 11-14 23:19:35.396 2931: 2931 E/   ] 
      process stopped due to unexpected signal 13 
I/HwSecImmHelper: mSecurityInputMethodService is null 
I/HwSecImmHelper: mSecurityInputMethodService is null 
I/HwSecImmHelper: mSecurityInputMethodService is null 
W/art: Suspending all threads took: 14.466ms 
I/FA: Tag Manager is not found and thus will not be used 
I/AppCompatViewInflater: app:theme is now deprecated. Please move to using android:theme instead. 
I/HwSecImmHelper: mSecurityInputMethodService is null 
I/HwSecImmHelper: mSecurityInputMethodService is null 
I/System: core_booster, getBoosterConfig = false 
I/System: core_booster, getBoosterConfig = false 
I/HwSecImmHelper: mSecurityInputMethodService is null 
I/AppCompatViewInflater: app:theme is now deprecated. Please move to using android:theme instead. 
E/RecyclerView: No adapter attached; skipping layout 
I/HwSecImmHelper: mSecurityInputMethodService is null 
I/HwSecImmHelper: mSecurityInputMethodService is null 
E/RecyclerView: No adapter attached; skipping layout 
I/HwSecImmHelper: mSecurityInputMethodService is null 
I/HwSecImmHelper: mSecurityInputMethodService is null 
I/HwSecImmHelper: mSecurityInputMethodService is null 
I/HwSecImmHelper: mSecurityInputMethodService is null 
W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found. 
I/Process: Sending signal. PID: 20588 SIG: 9 
Disconnected from the target VM, address: 'localhost:8600', transport: 'socket' 

これは私がlogcatから得るものです、エラーがないように思えます。トランザクション・スレッド内の各ノードを介しての反復の代わりに

               [ 11-14 23:21:49.129 2931: 2931 E/   ] 
                   process stopped due to unexpected signal 13 
11-14 23:21:49.321 21571-21571/com.pchatanan.tut I/System.out: waiting for debugger to settle... 
11-14 23:21:49.522 21571-21571/com.pchatanan.tut I/System.out: waiting for debugger to settle... 
11-14 23:21:49.723 21571-21571/com.pchatanan.tut I/System.out: waiting for debugger to settle... 

                   [ 11-14 23:21:49.781 2931: 2931 E/   ] 
                   process stopped due to unexpected signal 13 
11-14 23:21:49.924 21571-21571/com.pchatanan.tut I/System.out: waiting for debugger to settle... 
11-14 23:21:50.125 21571-21571/com.pchatanan.tut I/System.out: debugger has settled (1319) 
11-14 23:21:50.149 21571-21571/com.pchatanan.tut I/InstantRun: Instant Run Runtime started. Android package is com.pchatanan.tut, real application class is null. 

                   [ 11-14 23:21:50.364 2931: 2931 E/   ] 
                   process stopped due to unexpected signal 13 
11-14 23:21:50.842 21571-21633/com.pchatanan.tut W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found. 
11-14 23:21:50.863 21571-21633/com.pchatanan.tut W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found. 
11-14 23:21:50.973 21571-21571/com.pchatanan.tut I/FA: App measurement is starting up, version: 9877 
11-14 23:21:50.973 21571-21571/com.pchatanan.tut I/FA: To enable debug logging run: adb shell setprop log.tag.FA VERBOSE 
11-14 23:21:50.980 21571-21571/com.pchatanan.tut I/FA: To enable faster debug mode event logging run: 
                 adb shell setprop firebase.analytics.debug-mode com.pchatanan.tut 

                 [ 11-14 23:21:50.999 2931: 2931 E/   ] 
                 process stopped due to unexpected signal 13 
11-14 23:21:51.035 21571-21571/com.pchatanan.tut I/HwCust: Constructor found for class android.app.HwCustAlarmManagerImpl 
11-14 23:21:51.043 21571-21571/com.pchatanan.tut I/FirebaseInitProvider: FirebaseApp initialization successful 
11-14 23:21:51.140 21571-21571/com.pchatanan.tut I/HwCust: Constructor found for class android.app.HwCustHwWallpaperManagerImpl 
11-14 23:21:51.216 21571-21571/com.pchatanan.tut W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable 
11-14 23:21:51.601 21571-21571/com.pchatanan.tut I/AppCompatViewInflater: app:theme is now deprecated. Please move to using android:theme instead. 

                      [ 11-14 23:21:51.609 2931: 2931 E/   ] 
                      process stopped due to unexpected signal 13 
11-14 23:21:51.875 21571-21571/com.pchatanan.tut I/HwSecImmHelper: mSecurityInputMethodService is null 
11-14 23:21:51.925 21571-21571/com.pchatanan.tut W/ActionBarDrawerToggle: DrawerToggle may not show up because NavigationIcon is not visible. You may need to call actionbar.setDisplayHomeAsUpEnabled(true); 
11-14 23:21:52.015 21571-21571/com.pchatanan.tut I/DynamiteModule: Considering local module com.google.android.gms.firebase_database:4 and remote module com.google.android.gms.firebase_database:4 
11-14 23:21:52.015 21571-21571/com.pchatanan.tut I/DynamiteModule: Selected remote version of com.google.android.gms.firebase_database, version >= 4 
11-14 23:21:52.030 21571-21571/com.pchatanan.tut W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_chimera/m/00000018/n/arm64-v8a 
11-14 23:21:52.192 21571-21651/com.pchatanan.tut E/HAL: load: id=gralloc != hmi->id=gralloc 
11-14 23:21:52.193 21571-21651/com.pchatanan.tut I/OpenGLRenderer: Initialized EGL, version 1.4 
11-14 23:21:52.194 21571-21666/com.pchatanan.tut I/System: core_booster, getBoosterConfig = false 

                  [ 11-14 23:21:52.196 2931: 2931 E/   ] 
                  process stopped due to unexpected signal 13 
11-14 23:21:54.257 21571-21711/com.pchatanan.tut I/System: core_booster, getBoosterConfig = false 

                  [ 11-14 23:21:54.586 2931: 2931 E/   ] 
                  process stopped due to unexpected signal 13 


                  [ 11-14 23:21:55.208 2931: 2931 E/   ] 
                  process stopped due to unexpected signal 13 
11-14 23:21:56.193 21571-21571/com.pchatanan.tut W/Settings: Setting airplane_mode_on has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value. 
11-14 23:21:56.248 21571-21743/com.pchatanan.tut I/System: core_booster, getBoosterConfig = false 
11-14 23:21:56.279 21571-21743/com.pchatanan.tut I/System: core_booster, getBoosterConfig = false 

                  [ 11-14 23:21:56.442 2931: 2931 E/   ] 
                  process stopped due to unexpected signal 13 


                  [ 11-14 23:21:57.081 2931: 2931 E/   ] 
                  process stopped due to unexpected signal 13 
11-14 23:21:57.204 21571-21571/com.pchatanan.tut I/HwSecImmHelper: mSecurityInputMethodService is null 
11-14 23:21:57.206 21571-21571/com.pchatanan.tut I/HwSecImmHelper: mSecurityInputMethodService is null 
11-14 23:22:01.561 21571-21633/com.pchatanan.tut W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found. 

                    [ 11-14 23:22:01.587 2931: 2931 E/   ] 
                    process stopped due to unexpected signal 13 


                    [ 11-14 23:22:02.195 2931: 2931 E/   ] 
                    process stopped due to unexpected signal 13 


                    [ 11-14 23:22:02.874 2931: 2931 E/   ] 
                    process stopped due to unexpected signal 13 


                    [ 11-14 23:22:03.487 2931: 2931 E/   ] 
                    process stopped due to unexpected signal 13 
11-14 23:22:07.605 21571-21571/com.pchatanan.tut I/HwSecImmHelper: mSecurityInputMethodService is null 
11-14 23:22:07.720 21571-21641/com.pchatanan.tut I/FA: Tag Manager is not found and thus will not be used 
11-14 23:22:07.775 21571-21571/com.pchatanan.tut I/AppCompatViewInflater: app:theme is now deprecated. Please move to using android:theme instead. 
11-14 23:22:07.985 21571-21571/com.pchatanan.tut I/HwSecImmHelper: mSecurityInputMethodService is null 
11-14 23:22:07.985 21571-21571/com.pchatanan.tut I/HwSecImmHelper: mSecurityInputMethodService is null 
11-14 23:22:09.062 21571-21942/com.pchatanan.tut I/System: core_booster, getBoosterConfig = false 
11-14 23:22:09.141 21571-21942/com.pchatanan.tut I/System: core_booster, getBoosterConfig = false 
11-14 23:22:09.354 21571-21571/com.pchatanan.tut I/AppCompatViewInflater: app:theme is now deprecated. Please move to using android:theme instead. 
11-14 23:22:09.454 21571-21571/com.pchatanan.tut E/RecyclerView: No adapter attached; skipping layout 
11-14 23:22:09.471 21571-21571/com.pchatanan.tut I/HwSecImmHelper: mSecurityInputMethodService is null 
11-14 23:22:09.472 21571-21571/com.pchatanan.tut I/HwSecImmHelper: mSecurityInputMethodService is null 
11-14 23:22:09.476 21571-21571/com.pchatanan.tut E/RecyclerView: No adapter attached; skipping layout 
11-14 23:22:10.246 21571-21571/com.pchatanan.tut I/HwSecImmHelper: mSecurityInputMethodService is null 
11-14 23:22:10.308 21571-21571/com.pchatanan.tut I/HwSecImmHelper: mSecurityInputMethodService is null 
11-14 23:22:10.309 21571-21571/com.pchatanan.tut I/HwSecImmHelper: mSecurityInputMethodService is null 
11-14 23:22:10.313 21571-21571/com.pchatanan.tut I/HwSecImmHelper: mSecurityInputMethodService is null 
11-14 23:22:13.747 21571-21571/com.pchatanan.tut I/Process: Sending signal. PID: 21571 SIG: 9 
11-14 23:22:13.995 22048-22063/com.pchatanan.tut E/HAL: load: id=gralloc != hmi->id=gralloc 
11-14 23:22:14.012 22048-22048/com.pchatanan.tut I/InstantRun: Instant Run Runtime started. Android package is com.pchatanan.tut, real application class is null. 
11-14 23:22:14.575 22048-22083/com.pchatanan.tut W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found. 
11-14 23:22:14.659 22086-22100/com.pchatanan.tut E/HAL: load: id=gralloc != hmi->id=gralloc 
11-14 23:22:14.679 22086-22086/com.pchatanan.tut I/InstantRun: Instant Run Runtime started. Android package is com.pchatanan.tut, real application class is null. 
11-14 23:22:15.323 22086-22133/com.pchatanan.tut W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found. 
11-14 23:22:15.341 22086-22133/com.pchatanan.tut W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found. 
11-14 23:22:15.462 22086-22086/com.pchatanan.tut I/FA: App measurement is starting up, version: 9877 
11-14 23:22:15.462 22086-22086/com.pchatanan.tut I/FA: To enable debug logging run: adb shell setprop log.tag.FA VERBOSE 
11-14 23:22:15.471 22086-22086/com.pchatanan.tut I/FA: To enable faster debug mode event logging run: 
                 adb shell setprop firebase.analytics.debug-mode com.pchatanan.tut 
11-14 23:22:15.524 22086-22086/com.pchatanan.tut I/HwCust: Constructor found for class android.app.HwCustAlarmManagerImpl 
11-14 23:22:15.532 22086-22086/com.pchatanan.tut I/FirebaseInitProvider: FirebaseApp initialization successful 
11-14 23:22:25.611 22086-22133/com.pchatanan.tut W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found. 

Answer 1

、Iは.addListenerForSingleValueEventを使用し、各ノードを反復。次に、更新が必要なトランザクションコードについては、トランザクションコードを実行します。このメソッドは正常に動作します。

これは、次のコードで説明します。

private static void incrementUnreadCount(String chatRoomId) { 

     final DatabaseReference mDatabaseMemberList = mDatabaseChatRooms.child(chatRoomId).child("memberList"); 

     mDatabaseMemberList.addListenerForSingleValueEvent(new ValueEventListener() { 
      @Override 
      public void onDataChange(DataSnapshot dataSnapshot) { 
       for(DataSnapshot child : dataSnapshot.getChildren()){ 
        if(!child.getKey().equals(TutUserManager.getCurrentUid())){ 

         mDatabaseMemberList.child(child.getKey()).runTransaction(new Transaction.Handler() { 
          @Override 
          public Transaction.Result doTransaction(MutableData mutableData) { 

           Map<String, Object> tempData = (Map<String, Object>) mutableData.getValue(); 
           if(tempData == null){ 
            return Transaction.success(mutableData); 
           } 
           long unreadCount = (long) tempData.get("unreadCount"); 
           unreadCount += 1; 
           tempData.put("unreadCount", unreadCount); 
           mutableData.setValue(tempData); 
           return Transaction.success(mutableData); 
          } 

          @Override 
          public void onComplete(DatabaseError databaseError, boolean b, DataSnapshot dataSnapshot) { 

          } 
         }); 

        } 
       } 
      } 

      @Override 
      public void onCancelled(DatabaseError databaseError) { 

      } 
     }); 

    }