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 message_id as I want to show last message first.Here is my onBindViewHolder method in which i get the values.

public void onBindViewHolder(final MyAdapter_HomeViewHolder holder, final int position) {      holder.userNameTV.setText(data.get(position).getUserInfo().getFullName());     holder.msgBodyTV.setText(data.get(position).getBody());     holder.originator_iD.setText(data.get(position).getUserInfo().getId().toString());      //message ID. I need to serialize my recyclerView by this ID.biggest id should appear first.     holder.messageId.setText(data.get(position).getId().toString());      holder.owner_type_ET.setText("1");     holder.subject_ET.setText("Message");  } 

In case of you need to see the full code, https://pastebin.com/Zxmq36Gn

Answer 1

try this before passing your list to the adapter (after API call and before adapter notifydatasetchanged):

 Collections.sort(data, new Comparator<CustomData>() {             @Override             public int compare(CustomData lhs, CustomData rhs) {                 // -1 - less than, 1 - greater than, 0 - equal, all inversed for descending                 return lhs.getId() > rhs.getId() ? -1 : (lhs.customInt < rhs.customInt ) ? 1 : 0;             }         }); 

Answer 2

in Kotlin use like this after loading data in array:

myItems.sortWith(Comparator { lhs, rhs ->             // -1 - less than, 1 - greater than, 0 - equal, all inversed for descending             if (lhs.name > rhs.name) -1 else if (lhs.id < rhs.id) 1 else 0         }) 

After that apply:

myItemAdapter.notifyDataSetChanged()