Flutter如何将分组数据添加到列表中

import 'package:flutter/material.dart';

class GroupedListView extends StatelessWidget {
  final List<Group> groups;

  GroupedListView({required this.groups});

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: groups.length,
      itemBuilder: (context, groupIndex) {
        Group group = groups[groupIndex];
        return Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Padding(
              padding: EdgeInsets.all(8.0),
              child: Text(
                group.title,
                style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
              ),
            ),
            ListView.builder(
              shrinkWrap: true,
              physics: NeverScrollableScrollPhysics(),
              itemCount: group.items.length,
              itemBuilder: (context, itemIndex) {
                Item item = group.items[itemIndex];
                return ListTile(
                  title: Text(item.title),
                  subtitle: Text(item.description),
                );
              },
            ),
          ],
        );
      },
    );
  }
}

class Group {
  final String title;
  final List<Item> items;

  Group({required this.title, required this.items});
}

class Item {
  final String title;
  final String description;

  Item({required this.title, required this.description});
}

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      appBar: AppBar(
        title: Text('Grouped ListView'),
      ),
      body: GroupedListView(
        groups: [
          Group(
            title: 'Group 1',
            items: [
              Item(
                title: 'Item 1',
                description: 'Description 1',
              ),
              Item(
                title: 'Item 2',
                description: 'Description 2',
              ),
            ],
          ),
          Group(
            title: 'Group 2',
            items: [
              Item(
                title: 'Item 3',
                description: 'Description 3',
              ),
              Item(
                title: 'Item 4',
                description: 'Description 4',
              ),
            ],
          ),
        ],
      ),
    ),
  ));
}