如何在颤动中折叠其他ExpansionTile元素

import 'package:flutter/material.dart';

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

class _MyExpansionPanelListState extends State<MyExpansionPanelList> {
  List<Item> _data = generateItems(5);

  @override
  Widget build(BuildContext context) {
    return ListView(
      children: _data.map<Widget>((Item item) {
        return ExpansionPanelList(
          elevation: 1,
          expandedHeaderPadding: EdgeInsets.all(0),
          expansionCallback: (int index, bool isExpanded) {
            setState(() {
              item.isExpanded = !isExpanded;
              _data.forEach((otherItem) {
                if (otherItem != item) {
                  otherItem.isExpanded = false;
                }
              });
            });
          },
          children: [
            ExpansionPanel(
              headerBuilder: (BuildContext context, bool isExpanded) {
                return ListTile(
                  title: Text(item.headerValue),
                );
              },
              body: ListTile(
                title: Text(item.expandedValue),
              ),
              isExpanded: item.isExpanded,
            ),
          ],
        );
      }).toList(),
    );
  }
}

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

  String expandedValue;
  String headerValue;
  bool isExpanded;
}

List<Item> generateItems(int numberOfItems) {
  return List<Item>.generate(numberOfItems, (int index) {
    return Item(
      headerValue: 'Panel $index',
      expandedValue: 'This is item number $index',
    );
  });
}

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