flutter:在列表视图中随机化项目计数

import 'package:flutter/material.dart';
import 'dart:math';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Random List',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: RandomList(),
    );
  }
}

class RandomList extends StatefulWidget {
  @override
  _RandomListState createState() => _RandomListState();
}

class _RandomListState extends State<RandomList> {
  List<int> itemList = List.generate(10, (index) => index);

  void randomizeList() {
    setState(() {
      itemList.shuffle(Random());
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Random List'),
      ),
      body: ListView.builder(
        itemCount: itemList.length,
        itemBuilder: (context, index) {
          return ListTile(
            title: Text('Item ${itemList[index]}'),
          );
        },
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: randomizeList,
        child: Icon(Icons.shuffle),
      ),
    );
  }
}