Flutter -如何制作嵌套列表视图？

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('嵌套列表视图'),
        ),
        body: ListView(
          children: <Widget>[
            ListTile(
              title: Text('列表项1'),
            ),
            ListTile(
              title: Text('列表项2'),
              subtitle: ListView(
                children: <Widget>[
                  ListTile(
                    title: Text('子列表项1'),
                  ),
                  ListTile(
                    title: Text('子列表项2'),
                  ),
                ],
              ),
            ),
            ListTile(
              title: Text('列表项3'),
            ),
          ],
        ),
      ),
    );
  }
}