Easy way to reload

refreshList.dart

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

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('ListView Sample'),
        ),
        body: const RefreshList(),
      ),
    );
  }
}

class RefreshList extends StatefulWidget {
  const RefreshList({super.key});

  @override
  State<RefreshList> createState() => _RefreshListState();
}

class _RefreshListState extends State<RefreshList> with ChangeNotifier {
  List<String> items = List.generate(30, (index) => "Item ${index + 1}");

  void shuffleList() {
    items.shuffle(Random()); // <-　setStateを指定しない。利用したい箇所はnotify()methodでリロード
    notify();
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Expanded(
          child: ListView.builder(
            itemCount: items.length,
            itemBuilder: (context, index) {
              return ListTile(
                title: Text(items[index]),
              );
            },
          ),
        ),
        Padding(
          padding: const EdgeInsets.all(16.0),
          child: ElevatedButton(
            onPressed: shuffleList,
            child: const Text('Reload Data'),
          ),
        ),
      ],
    );
  }

  void notify() {
    setState(() {
      notifyListeners();
    });
  }
}

default.mov