如何在Flutter中构建可扩展列表

import 'package:flutter/material.dart';

class MyListState extends State<MyListPage> {
  List<String> items = ['Item 1', 'Item 2', 'Item 3']; // 初始列表项

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: items.length,
      itemBuilder: (BuildContext context, int index) {
        return ListTile(
          title: Text(items[index]),
        );
      },
    );
  }
}

class MyListPage extends StatefulWidget {
  @override
  MyListState createState() => MyListState();
}

void main() {
  runApp(MaterialApp(
    home: MyListPage(),
  ));
}