How can i get the value inside the child and put it on a array

Question

heres a image of my database:

heres my code

Query countQuery = databaseReference.child("evacuation").orderByChild("evacuationNumber");

List<Places> placesList = new ArrayList<>();

countQuery.addChildEventListener(new ChildEventListener() {
    @Override
    public void onChildAdded(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
        Places places = snapshot.getValue(Places.class);
        Sampleviewtxt.setText((CharSequence) places);
    }

    @Override
    public void onChildChanged(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
    }

    @Override
    public void onChildRemoved(@NonNull DataSnapshot snapshot) {
    }

    @Override
    public void onChildMoved(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
    }

    @Override
    public void onCancelled(@NonNull DatabaseError error) {
    }
});