在flutter中将参数值传递到Itembuilder外部

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('Flutter Demo')),
        body: MyList(),
      ),
    );
  }
}

class MyList extends StatefulWidget {
  @override
  _MyListState createState() => _MyListState();
}

class _MyListState extends State<MyList> {
  // 定义一个回调函数，用于接收ItemBuilder中的参数值
  void onItemSelected(String value) {
    print('选中的值: $value');
  }

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: 10,
      itemBuilder: (BuildContext context, int index) {
        return ListTile(
          title: Text('Item $index'),
          onTap: () {
            // 将参数值传递给onItemSelected回调函数
            onItemSelected('Item $index');
          },
        );
      },
    );
  }
}