CODEWITHSUNDEEP
androidfirebasefirebase-realtime-database
Ahmed Yasser
Ahmed Yasser

Reputation: 31

How to show Firebase data in recyclerview without duplicates

When I add a post, the list repeats again, I would like add just one post .

No problem when writing data on Firebase but there is a problem when reading from Firebase, all posts repeats ..

   final NotesAdapter notesAdapter=new NotesAdapter(list,this);
    recyclerView.setAdapter(notesAdapter);
    FloatingActionButton fab = findViewById(R.id.fab);
    firebaseDatabase=FirebaseDatabase.getInstance();
    databaseReference=firebaseDatabase.getReference("Posts");

    Query query =  databaseReference.orderByKey();

    query.addValueEventListener(new ValueEventListener() { 
  
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {


            for(DataSnapshot dataSnapshot1: dataSnapshot.getChildren())
            {
                Listdata listdata=dataSnapshot1.getValue(Listdata.class); 
                list.add(listdata); 

                       }
            notesAdapter.notifyDataSetChanged();



        }

Upvotes: 2

Views: 122

Answers (1)

Iona Bartishvili
Iona Bartishvili

Reputation: 97

you have to clear the list before you get info from database, then add elements and do adapter.notifySetDataChange().

Upvotes: 2

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