How to sort RecyclerView item in android

Question

I\'m working on a android chatting application. When I called my api it returns me the chat list sorted by a user_id. But what I need to do is serialized by

Answer 1

 List<Items_Detail_model>items_model;
  Collections.sort(items_model, new Comparator<Items_Detail_model>() {
            @Override
            public int compare(Items_Detail_model o1, Items_Detail_model o2) {
                return o1.getDate().compareTo(o2.getDate());
            }
        });