MessageListActivity.java

public class MessageListActivity extends AppCompatActivity {
    private RecyclerView mMessageRecycler;
    private MessageListAdapter mMessageAdapter;
    @Override
  
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_message_list);

        mMessageRecycler = (RecyclerView) findViewById(R.id.reyclerview_message_list);
        mMessageAdapter = new MessageListAdapter(this, messageList);
        mMessageRecycler.setLayoutManager(new LinearLayoutManager(this));
    }
}