import'package:flutter/material.dart';import'package:flutter/cupertino.dart';import'package:flutter/services.dart';finalColor darkBlue=Color.fromARGB(255,18,32,47);voidmain() {runApp(MyApp());}classMyAppextendsStatelessWidget {@overrideWidgetbuild(BuildContext context) {returnMaterialApp(      theme:ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),      debugShowCheckedModeBanner:false,      home:Scaffold(        body:Center(          child:MyWidget(),        ),      ),    );  }}classMyWidgetextendsStatelessWidget {@overrideWidgetbuild(BuildContext context) {returnTextField(      autocorrect:false,      enableSuggestions:false,      keyboardType:TextInputType.emailAddress,      inputFormatters: [FilteringTextInputFormatter.allow(RegExp(r"""[a-zA-Z0-9\_\.\,\-\(\)\/\=\+\?\>\<\!\*\'\"\;\&\@\#\:\%\[\]\‘\\\$\{\}\^\|\~\`]+""")),      ],    );  }}

╰ flutter doctor -v[✓] Flutter (Channel beta, 2.1.0-12.2.pre, on Mac OS X 10.15.5 19F101 darwin-x64, locale zh-Hans-CN)    • Flutter version 2.1.0-12.2.pre at /Users/liuyanfeng/Library/flutter    • Framework revision 5bedb7b1d5 (3 weeks ago), 2021-03-17 17:06:30 -0700    • Engine revision 711ab3fda0    • Dart version 2.13.0 (build 2.13.0-116.0.dev)    • Pub download mirror https://pub.flutter-io.cn    • Flutter download mirror https://storage.flutter-io.cn[✓] Android toolchain - developfor Android devices (Android SDK version 29.0.2)    • Android SDK at /Users/liuyanfeng/Library/Android/sdk    • Platform android-30, build-tools 29.0.2    • ANDROID_HOME = /Users/liuyanfeng/Library/Android/sdk    • Java binary at: /Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/bin/java    • Java version Java(TM) SE Runtime Environment (build 1.8.0_191-b12)    • All Android licenses accepted.[✓] Xcode - developfor iOS and macOS    • Xcode at /Applications/Xcode.app/Contents/Developer    • Xcode 12.4, Build version 12D4e    • CocoaPods version 1.10.1[✓] Chrome - developfor the web    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome[!] Android Studio (not installed)    • Android Studio not found; download from https://developer.android.com/studio/index.html      (or visit https://flutter.dev/docs/get-started/install/macos#android-setupfor detailed instructions).[✓] IntelliJ IDEA Ultimate Edition (version 2019.2.3)    • IntelliJ at /Applications/IntelliJ IDEA.app    • Flutter plugin version 43.0.2    • Dart plugin version 192.8052[✓] Proxy Configuration    • HTTP_PROXY isset    • NO_PROXY is localhost,127.0.0.1    • NO_PROXY contains 127.0.0.1    • NO_PROXY contains localhost[✓] Connected device (4 available)    • JKM AL00a (mobile) • HYJNW18A15002346                         • android-arm64  • Android 9 (API 28)    • Ha0 (mobile)       • 60748a91d3d416ed437eb16315e99de062468d7a • ios            • iOS 14.2    • macOS (desktop)    • macos                                    • darwin-x64     • Mac OS X 10.15.5 19F101 darwin-x64    • Chrome (web)       • chrome                                   • web-javascript • Google Chrome 89.0.4389.114! Doctor found issuesin 1 category.