MainActivity.java

        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                return true;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                if (!newText.isEmpty()) {
                    adapter.setNamesList(namesAPI.searchForName(query));
                    adapter.notifyDataSetChanged();
                }
                return true;
            }
        });