如何用列表视图生成器flutter实现ExpansionPanelList？

import 'package:flutter/material.dart';

class Item {
  Item({
    required this.expandedValue,
    required this.headerValue,
    required this.isExpanded,
  });

  String expandedValue;
  String headerValue;
  bool isExpanded;
}

class MyExpansionPanelList extends StatefulWidget {
  @override
  _MyExpansionPanelListState createState() => _MyExpansionPanelListState();
}

class _MyExpansionPanelListState extends State<MyExpansionPanelList> {
  List<Item> _data = generateItems(5); // 初始化数据模型

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: _data.length,
      itemBuilder: (BuildContext context, int index) {
        return ExpansionPanelList(
          elevation: 1,
          expandedHeaderPadding: EdgeInsets.all(0),
          expansionCallback: (int panelIndex, bool isExpanded) {
            setState(() {
              _data[index].isExpanded = !isExpanded;
            });
          },
          children: [
            ExpansionPanel(
              headerBuilder: (BuildContext context, bool isExpanded) {
                return ListTile(
                  title: Text(_data[index].headerValue),
                );
              },
              body: ListTile(
                title: Text(_data[index].expandedValue),
              ),
              isExpanded: _data[index].isExpanded,
            ),
          ],
        );
      },
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      appBar: AppBar(
        title: Text('Expansion Panel List'),
      ),
      body: MyExpansionPanelList(),
    ),
  ));
}