MainActivity.java

package elixer.com.threadpool;

 public class MainActivity extends AppCompatActivity {

    private ArrayList<String> mTaskNames = new ArrayList<>();
    private RecyclerView recyclerView;
    private RecyclerView.Adapter mAdapter;
    private RecyclerView.LayoutManager layoutManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initTaskNames();
        initRecyclerView();
    }
    private void initTaskNames() {
        for (int i = 1; i < 5; i++) {
            mTaskNames.add("Task Number " + i);
        }
    }

    private void initRecyclerView() {
        recyclerView = findViewById(R.id.recycler_view);
        recyclerView.setHasFixedSize(true);
        layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);

        mAdapter = new RecyclerViewAdapter(this, mTaskNames);
        recyclerView.setAdapter(mAdapter);
    }
}