通过adapter.add无法从Aysntask更新列表视图

// 定义回调接口
public interface OnTaskCompleted {
    void onTaskCompleted(String result);
}

// Aysntask类
public class MyTask extends AsyncTask<Void, Void, String> {
    private OnTaskCompleted listener;

    public MyTask(OnTaskCompleted listener) {
        this.listener = listener;
    }

    @Override
    protected String doInBackground(Void... params) {
        // 执行后台任务
        return "新的列表项";
    }

    @Override
    protected void onPostExecute(String result) {
        // 执行完任务后调用回调方法
        listener.onTaskCompleted(result);
    }
}

// 主线程中使用Aysntask并更新列表视图
public class MainActivity extends AppCompatActivity implements OnTaskCompleted {
    private ListView listView;
    private ArrayAdapter<String> adapter;

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

        listView = findViewById(R.id.listView);
        adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1);
        listView.setAdapter(adapter);

        // 创建Aysntask并执行
        MyTask task = new MyTask(this);
        task.execute();
    }

    @Override
    public void onTaskCompleted(String result) {
        // 在回调方法中更新列表视图
        adapter.add(result);
    }
}