Cannot retrieve data in ascending order

Question

I want to retrieve data in ascending order, but received data somehow added to recyclerview in descending order.

Firebase Database:

Answer 1

To get a sorted and filtered result, you have to pass a query into the FirebaseRecyclerAdapter constructor:

public MyFireAdapterDiasFiestaRecyclerView(
    Class<DiaFiestaMeta> modelClass, 
    int modelLayout, 
    Class<MyFireViewHolder> viewHolderClass, 
    Query query) {
    ...

And then invoke it with a query that orders and filters:

adapter = new MyFireAdapterDiasFiestaRecyclerView(
   DiaFiestaMeta.class,
   layout_that_you_use,
   MyFireViewHolder.class,
   ref.orderByChild("property_to_sort_and_filter_on").equalTo("value_to_filter_on")
);

Answer 2

Since you can't do that natively with the RTDB, you'll probably want to do something like this:

LinearLayoutManager layoutManager = new LinearLayoutManager(context);
layoutManager.setReverseLayout(true);
layoutManager.setStackFromEnd(true);
recyclerView.setLayoutManager(layoutManager);

See https://stackoverflow.com/a/27727398/4548500 for more details.