小编Diy*_*Dev的帖子

我正在更新一个旧项目。该二维码扫描仪出现错误。该项目之前在 flutter 2.10 上运行。Flutter 3.0 存在错误。

import 'package:flutter/material.dart';\nimport 'package:qr_code_scanner/qr_code_scanner.dart';\nimport 'dart:io';\nimport 'package:flutter/foundation.dart';\n\nvoid main() {\n  runApp(const MyApp());\n}\n\nclass MyApp extends StatelessWidget {\n  const MyApp({Key? key}) : super(key: key);\n\n  // This widget is the root of your application.\n  @override\n  Widget build(BuildContext context) {\n    return MaterialApp(\n      title: 'Flutter Demo',\n      theme: ThemeData(\n        \n        primarySwatch: Colors.blue,\n      ),\n      home: const MyHomePage(title: 'Flutter Demo Home Page'),\n    );\n  }\n}\n\nclass MyHomePage extends StatefulWidget {\n  const MyHomePage({Key? key, required this.title}) : super(key: key);\n\n\n  final String title;\n\n  @override\n  State<MyHomePage> createState() => _MyHomePageState();\n}\n\nclass …