java - Adding object to ArrayList

Question

I'm trying to add objects received from Firebase Database to an ArrayList. However, the list stays empty even after calling the add method. What am I doing wrong? I'm trying to load data from firebase and is display it in a list view. I used log statements to check if the data from firebase is being received and it is. Anybody with suggestions?

public class RescueFragment extends Fragment {

    public RescueFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.rescue_list, container, false);

        final FirebaseDatabase database = FirebaseDatabase.getInstance();
        DatabaseReference ref = database.getReference("rescue");

        final ArrayList<RescueAnimal> rescueList = new ArrayList<>();

        ref.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                for (DataSnapshot messageSnapshot: dataSnapshot.getChildren()) {
                    String location = (String) messageSnapshot.child("location").getValue();
                    String appearance = (String) messageSnapshot.child("appearance").getValue();
                    String photo = (String) messageSnapshot.child("photo").getValue();
                    String species = (String) messageSnapshot.child("species").getValue();
                    String problem = (String) messageSnapshot.child("problem").getValue();
                    rescueList.add(new RescueAnimal(location, appearance, photo, species, problem));
                }
            }
            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });

        RescueAdapter adapter = new RescueAdapter(getActivity(), rescueList);
        ListView listView = view.findViewById(R.id.rescue_list);
        listView.setAdapter(adapter);
        return view;

Answer 1

Waitting for answers