没有构造函数“MaterialApp”具有在类“MaterialApp”

问题描述

我刚刚创建了一个新的 Flutter 项目并开始整理我的文件夹，这就是我现在所拥有的：

我正在尝试在 Windows 上运行它，因为我将在这个项目中使用 Flutter Desktop，当我点击运行时，它构建并运行得很好，但是当我进行热重载时，应用程序会抛出此错误消息：

No constructor 'MaterialApp.' with matching arguments declared in class 'MaterialApp'.
Receiver: MaterialApp
Tried calling: new MaterialApp.()
Found: new MaterialApp.({Key? key,GlobalKey<NavigatorState>? navigatorKey,GlobalKey<ScaffoldMessengerState>? scaffoldMessengerKey,Widget? home,Map<String,(BuildContext) => Widget> routes,String? initialRoute,((RouteSettings) => Route<dynamic>?)? onGenerateRoute,((String) => List<Route<dynamic>>)? onGenerateInitialRoutes,((RouteSettings) => Route<dynamic>?)? onUnkNownRoute,List<NavigatorObserver> navigatorObservers,((BuildContext,Widget?) => Widget)? builder,String title,((BuildContext) => String)? onGenerateTitle,Color? color,ThemeData? theme,ThemeData? darkTheme,ThemeData? highContrastTheme,ThemeData? highContrastDarkTheme,ThemeMode? themeMode,Locale? locale,Iterable<LocalizationsDelegate<dynamic>>? localizationsDelegates,((List<Locale>?,Iterable<Locale>) => Locale?)? localeListResolutionCallback,((Locale?,Iterable<Locale>) => Locale?)? localeResolutionCallback,Iterable<Locale> supportedLocales,bool debugShowMaterialGrid,bool showPerformanceOverlay,bool checkerboardRasterCacheImages,bool checkerboardOffscreenLayers,bool showSemanticsDebugger,bool debugShowCheckedModeBanner,Map<LogicalKeySet,Intent>? shortcuts,Map<Type,Action<Intent>>? actions,String? restorationScopeId}) => MaterialApp

这是我的 main.dart 的内容：

import 'package:Flutter/material.dart';

import 'package:beryllium/src/screens/HomeScreen.dart';

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  MyApp({Key key}) : super(key: key);

  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Beryllium',initialRoute: '/',routes: {
        '/': (contex) => HomeScreen(),//Home screen widget
      },);
  }
}

这是 HomeScreen.dart 文件的内容：

import 'package:Flutter/material.dart';

class HomeScreen extends StatefulWidget {
  HomeScreen({Key key}) : super(key: key);

  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  @override
  Widget build(BuildContext context) {
    return new _HomeScreen();
  }
}

class _HomeScreen extends StatelessWidget {
  const _HomeScreen({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('My Book'),),body: Center(
          child: Container(
            child: Text('Home Screen'),));
  }
}

如果有人对避免此错误有任何想法，请帮助我。

提前致谢。

解决方法

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