Add items to the top of Recyclerview with Firebaserecycleradapter

Question

How do I add items to the top of a RecyclerView using the FirebaseRecyclerAdapter?

By default, whenever I add an item, it goes to the bottom of the Recyclerview list, and I want it to go to the top. Remembering that this Adapter is different from the standard of Android.

noteAdapter = new FirebaseRecyclerAdapter<Note, NoteHolder>(Note.class, R.layout.note_item, NoteHolder.class, dbRef) {

            @Override
            protected void populateViewHolder(NoteHolder viewHolder, final Note model, final int position) {
                viewHolder.setTitle(model.getTitle());
                viewHolder.setContent(model.getContent());
                viewHolder.setColor(model.getColorBg());

                model.setId(getRef(position).getKey());

                viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Intent it = new Intent(v.getContext(), NoteDetailActivity.class);
                        it.putExtra(Note.NOTE_PARCE, model);
                        startActivity(it);
                    }
                });
            }
        };

        notesRecyclerView.setLayoutManager(layoutManager);
        notesRecyclerView.setAdapter(noteAdapter);

UPDATE: Researching on, I saw that this adapter picks up the information exactly as it is on firebase, including the order, so I would have to insert already in the right order in the firebase, but how to do this?

Answer 1

You can use the static method reverse() class Collections. Since your code does not contain where you rescue the list items, I will give a basic example below:

    ArrayList<String> actores = new ArrayList<String> ();
    actores.add("JON SNOW");
    actores.add("DAENERYS");
    actores.add("KHAL DROGO");
    actores.add("NED STARK");
    actores.add("MONTANHA ");
    actores.add("TYWIN LANNISTER");

    System.out.print(actores);

Exit:

[JON SNOW, DAENERYS, KHAL DROGO, NED STARK, MONTANHA , TYWIN LANNISTER]

---

Now using Collections.reverse():

Collections.reverse(actores);
System.out.print(actores);

Exit:

[TYWIN LANNISTER, MONTANHA , NED STARK, KHAL DROGO, DAENERYS, JON SNOW]

Note that you have reversed the list in relation to the insertion. So, just adapt to your needs. For more details see in the documentation.

Behold functioning on the ideone.