如何使用AsyncTask更改同一活动的布局？

public class MyAsyncTask extends AsyncTask<Void, Void, String> {
    private Context context;
    private TextView textView;

    public MyAsyncTask(Context context, TextView textView) {
        this.context = context;
        this.textView = textView;
    }

    @Override
    protected String doInBackground(Void... voids) {
        // 在后台执行耗时操作，如网络请求、数据库操作等
        // 返回操作结果
        return "Hello, AsyncTask!";
    }

    @Override
    protected void onPostExecute(String result) {
        // 在主线程更新UI，即更改布局
        textView.setText(result);
    }
}

public class MainActivity extends AppCompatActivity {
    private TextView textView;

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

        textView = findViewById(R.id.textView);

        // 实例化AsyncTask子类的对象，并执行
        MyAsyncTask myAsyncTask = new MyAsyncTask(this, textView);
        myAsyncTask.execute();
    }
}