Firebase onChildChanged Listener wird zweimal gefeuert

Question

Ich bin sehr seltsames Problem mit firebase konfrontiert, habe ich Daten im angefügten Format in firebase und ich versuche, die Daten wiederherzustellen gesamte recyclerview Adapterliste abrufen, wenn einer der untergeordneten Knoten für diese Konversation geändert.

Wenn ich es mit Debugger ausgeführt, es onChildChanged() nur einmal ausgelöst, aber ansonsten zweimal ausgelöst, bitte helfen.

private void getConversations(){ 

    final DatabaseReference conversationRef = databaseReference.child("conversation").child(currentUser); 

    // Get event fired when new child added 
    conversationRef.orderByChild("time").addChildEventListener(new ChildEventListener() { 
     @Override 
     public void onChildAdded(DataSnapshot dataSnapshot, String prevChildKey) { 
      String ref= dataSnapshot.getKey(); 
      int position = userListRef.size(); 
      userListRef.add(position,ref); 
      getDetailedConversations(position); 
     } 

     @Override 
     public void onChildChanged(DataSnapshot dataSnapshot, String prevChildKey) { 
       userListRef.clear(); 
       conversationListRef.clear(); 
       conversationAdapter.clear(); 
       //conversationAdapter.notifyDataSetChanged(); 
       Log.d(TAG, "new position: data changed+++++++++++++++++++++"); 
       conversationRef.removeEventListener(this); 
       getConversations(); 

     } 

     @Override 
     public void onChildRemoved(DataSnapshot dataSnapshot) {} 

     @Override 
     public void onChildMoved(DataSnapshot dataSnapshot, String prevChildKey) {} 

     @Override 
     public void onCancelled(DatabaseError databaseError) {} 


    }); 
} 

private void getDetailedConversations(final int position){ 

    DatabaseReference databaseReferenceAdapter = FirebaseDatabase.getInstance().getReference(); 
    final DatabaseReference conversationRef = databaseReferenceAdapter.child("conversation").child(currentUser).child(userListRef.get(position)); 

    conversationRef.addListenerForSingleValueEvent(new ValueEventListener() { 
     @Override 
     public void onDataChange(DataSnapshot dataSnapshot) { 
      Log.d(TAG,"Single value event"); 
      final Conversation conversation = dataSnapshot.getValue(Conversation.class); 
      conversation.setFirebaseToken(dataSnapshot.getKey()); 
      conversationListRef.add(conversation); 
      conversationAdapter.notifyDataSetChanged(); 
     } 

     @Override 
     public void onCancelled(DatabaseError databaseError) { 

     } 
    }); 
} 

LogCat:

11-07 22:56:01.127 15524-15577/io.ace.aceme E/Surface: 
getSlotFromBufferLocked: unknown buffer: 0x9b9e2860 
11-07 22:56:02.618 15524-15573/io.ace.aceme V/FA: Inactivity, 
disconnecting from AppMeasurementService 
11-07 22:56:05.566 15524-15524/io.ace.aceme D/MessagesActivity: new 
position: data changed+++++++++++++++++++++ 
11-07 22:56:05.570 15524-15524/io.ace.aceme D/MessagesActivity: 
Single value event 
11-07 22:56:05.785 15524-15524/io.ace.aceme D/MessagesActivity: new 
position: data changed+++++++++++++++++++++ 
11-07 22:56:05.785 15524-15524/io.ace.aceme D/MessagesActivity: 
Single value event 
11-07 22:56:05.786 15524-15524/io.ace.aceme D/MessagesActivity: 
Single value event 
11-07 22:56:06.134 15524-15524/io.ace.aceme D/MessagesActivity: 
Single value event 
11-07 22:56:06.134 15524-15524/io.ace.aceme D/MessagesActivity: 
Single value event 
11-07 22:56:06.137 15524-15524/io.ace.aceme D/MessagesActivity: 
Single value event 
11-07 22:56:07.393 15524-15573/io.ace.aceme V/FA: Activity paused, 
time: 16426758 
11-07 22:56:07.398 15524-15573/io.ace.aceme V/FA: Activity resumed, 
time: 16426764 

Firebase Datenbank:

Database pic

Answer 1

Hier wird die aktualisierte Abfrage, keine Notwendigkeit zu verwenden orderBy

private void getConversations(){ 

final DatabaseReference conversationRef = databaseReference.child("conversation").child(currentUser); 

// Get event fired when new child added 
conversationRef.addChildEventListener(new ChildEventListener() { 
    @Override 
    public void onChildAdded(DataSnapshot dataSnapshot, String prevChildKey) { 
     String ref= dataSnapshot.getKey(); 
     int position = userListRef.size(); 
     userListRef.add(position,ref); 
     getDetailedConversations(position); 
    } 

    @Override 
    public void onChildChanged(DataSnapshot dataSnapshot, String prevChildKey) { 
      //Here no need to clear and reload 
      //just find the user in list and update the corresponding object and call notifyDatasetChanged() 

    } 

    @Override 
    public void onChildRemoved(DataSnapshot dataSnapshot) {} 

    @Override 
    public void onChildMoved(DataSnapshot dataSnapshot, String prevChildKey) {} 

    @Override 
    public void onCancelled(DatabaseError databaseError) {} 


}); 

}