How to sort RecyclerView item in android

Before passing the data to RecyclerView adapter

data.sort(new Comparator<Datum>() {
            @Override
            public int compare(Datum o1, Datum o2) {
                return o1.get(position).getMessageId().compareTo(o2.get(position).getMessageId());
            }
        });

then pass (notify) the sorted list to the adapter.

A simpler solution for someone still stuck on the same

  Collections.sort(data, new Comparator<CustomData>() {
            @Override
            public int compare(CustomData lhs, CustomData rhs) {
                return Integer.compare( rhs.getId(),lhs.getId());
            }
        });

YourAdapter adapter = new YourAdapter(context, data);

//Setup Linear or Grid Layout manager
 recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
 recyclerView.setAdapter(adapter);

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()

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;
            }
        });