您有几种选择，具体取决于您如何构建应用程序或在哪里拥有中心状态。
我在这里为您提出一种更新本地地图变量的解决方案。或者，您可以将事件/流发送到商店所在的地方。
import 'package:flutter/material.dart';void main() => runApp(new MyApp());class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: MyHomePage(), ); }}class MyHomePage extends StatefulWidget { @override _MyHomePageState createState() => _MyHomePageState();}class _MyHomePageState extends State<MyHomePage> { List<Item> itemList = [ Item("ID1", "First product"), Item("ID2", "Second product"), ]; Map<String, int> quantities = {}; void takeNumber(String text, String itemId) { try { int number = int.parse(text); quantities[itemId] = number; print(quantities); } on FormatException {} } Widget singleItemList(int index) { Item item = itemList[index]; return Container( decoration: BoxDecoration( color: Colors.white, ), child: Row( children: [ Expanded(flex: 1, child: Text("${index + 1}")), Expanded( flex: 3, child: TextField( keyboardType: TextInputType.number, onChanged: (text) { takeNumber(text, item.id); }, decoration: InputDecoration( labelText: "Qty", ), ), ), ], ), ); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text("Demo")), body: Center( child: ListView.builder( shrinkWrap: true, itemCount: itemList.length, itemBuilder: (context, index) { if (itemList.isEmpty) { return CircularProgressIndicator(); } else { return singleItemList(index); } }), ), ); }}class Item { final String id; final String name; Item(this.id, this.name);}
