当传递的变量稍后初始化时，如何在onCreate中设置回收器视图适配器？

public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private RecyclerView.Adapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        recyclerView = findViewById(R.id.recyclerView);
        // 其他初始化操作...

        // 当变量初始化完成后，设置适配器
        adapter = new MyAdapter(dataList);
        recyclerView.setAdapter(adapter);
    }
}