flutter :将数据插入列表并保留旧数据

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  List<String> dataList = ['Item 1', 'Item 2', 'Item 3']; // 初始数据列表

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter List Example'),
        ),
        body: ListView.builder(
          itemCount: dataList.length,
          itemBuilder: (BuildContext context, int index) {
            return ListTile(
              title: Text(dataList[index]),
            );
          },
        ),
        floatingActionButton: FloatingActionButton(
          child: Icon(Icons.add),
          onPressed: () {
            // 在列表末尾插入新数据
            setState(() {
              dataList.add('New Item');
            });
          },
        ),
      ),
    );
  }
}