Flutter：应用程序在热重载后不断回到初始路线
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【中文标题】Flutter：应用程序在热重载后不断回到初始路线【英文标题】：Flutter: App keeps going back to initial route after hot reload 【发布时间】：2021-03-18 17:47:35 【问题描述】：我刚刚根据迁移指南https://firebase.flutter.dev/docs/migration 将 FireBase 插件升级到最新版本，并开始注意到每当我进行热重载时，我的应用程序都会进行热重启并返回初始路线。首先我认为这可能是 android Studio 的问题，所以我也尝试了命令提示符和 VS 代码，但结果相同。我已经搜索了与该主题相关的旧 *** 问题，但找不到任何可以解决问题的东西。 我在下面复制我的代码。 PS：我对 Flutter 很陌生，这是我在 *** 中遇到的第一个问题。
非常感谢任何帮助。 编辑：刚刚调试它，发现执行热重载时它会回到 runApp(...) 。
main.dart
void main() async
String authMethod;
WidgetsFlutterBinding.ensureInitialized();
SharedPreferenceService localStorage = SharedPreferenceService();
authMethod = await localStorage.getAuthMode();
print("Authentication Mode $authMethod");
setupLocator();
runApp(
DevicePreview(
enabled: false,//kReleaseMode,
builder: (context)=>AppInitialization())
);
AppInitialization.dart
class AppInitialization extends StatelessWidget
final Future<FirebaseApp> _initialization = Firebase.initializeApp();
@override
Widget build(BuildContext context)
return FutureBuilder(
future: _initialization,
builder: (context, snapshot)
if (snapshot.hasError)
return Center(
child: Container(
child: Text('Unable to Initialize FireBase'),
),
);
if (snapshot.connectionState == ConnectionState.done)
print("======= F I R E B A S E A P P ========");
return LocalGroceryOnline();
return Center(
child: SizedBox(
height: 40,
width: 40,
child: CircularProgressIndicator(
strokeWidth: 2.0,
valueColor: AlwaysStoppedAnimation<Color>(Colors.redAccent, )),
),
);
);
LocalGroceryOnline.dart
class LocalGroceryOnline extends StatelessWidget
final GlobalKey<NavigatorState> navigatorKey = new GlobalKey<NavigatorState>();
@override
Widget build(BuildContext context)
return MultiProvider (
providers: [
Provider<FirebaseAuthService>(create: (_) => FirebaseAuthService()),
Provider<SignInHelperService>(create: (_) => SignInHelperService()),
Provider<SharedPreferenceService>(create: (_) => SharedPreferenceService()),
ChangeNotifierProvider<CartModel>(create: (_) => CartModel()),
ChangeNotifierProvider<UserModel>(create: (_) => UserModel()),
ChangeNotifierProvider<ProductModel>(create: (_) => ProductModel()),
ChangeNotifierProvider<cat.Category>(create: (_) => cat.Category()),
ChangeNotifierProvider<AppSetting>(create: (_) => AppSetting()),
ChangeNotifierProvider<ValueNotifier<bool>>(create: (_) => ValueNotifier<bool>(false),),
ChangeNotifierProvider<ValueNotifier<int>>(create: (_) => ValueNotifier<int>(0),)
],
child: MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Online Local Grocery',
locale: DevicePreview.of(context).locale,
builder: DevicePreview.appBuilder,
theme: ThemeData(
primaryColor: Colors.white,
fontFamily: 'Montserrat',
appBarTheme: AppBarTheme(elevation: 0.0), //This is important
),
initialRoute: AuthWidget.id,
navigatorKey: navigatorKey,
onGenerateRoute: RouteGenerator.generateRoute,
//onGenerateInitialRoutes: InitialRouteGenerator.generateRoute(),
)
,
);
RouteGenerator.dart
class RouteGenerator
static Route<dynamic> generateRoute(RouteSettings settings)
final args = settings.arguments;
switch (settings.name)
case AuthWidget.id:
return MaterialPageRoute(builder: (_) => AuthWidget());
case SignUpSelectionScreen.id:
return MaterialPageRoute(builder: (_) => SignUpSelectionScreen());
case SignupForm.id:
return MaterialPageRoute(builder: (_) => SignupForm());
case LoginView.id:
return MaterialPageRoute(builder: (_) => LoginView());
case HomePage.id:
return MaterialPageRoute(builder: (_) => HomePage());
case MainPage.id:
if (args.runtimeType == MainCategory)
return MaterialPageRoute(
builder: (_) => MainPage(
mainCategory: args,
));
return _errorRoute();
case ProductDetail.id:
if (args.runtimeType == SelectedProductArguments)
return MaterialPageRoute(
builder: (_) => ProductDetail(
selectedProductArguments: args,
));
return _errorRoute();
case CheckOutScreen.id:
return MaterialPageRoute(builder: (_) => CheckOutScreen());
case Admin.id:
return MaterialPageRoute(builder: (_) => Admin());
case ScrapBoard.id:
return MaterialPageRoute(builder: (_) => ScrapBoard());
case ProductAdminView.id:
return MaterialPageRoute(builder: (_) => ProductAdminView());
case DeliveryAddressView.id:
return MaterialPageRoute(builder: (_) => DeliveryAddressView());
case PaymentView.id:
return MaterialPageRoute(builder: (_) => PaymentView());
case OrderProcessingView.id:
return MaterialPageRoute(builder: (_) => OrderProcessingView());
case MyOrdersView.id:
return MaterialPageRoute(builder: (_) => MyOrdersView());
case MyOrderDetails.id:
if (args.runtimeType == Order)
return MaterialPageRoute(builder: (_) => MyOrderDetails(
order: args,
)
);
return _errorRoute();
default:
// If there is no such named route in the switch statement, e.g. /third
return _errorRoute();
static Route<dynamic> _errorRoute()
return MaterialPageRoute(builder: (_)
return Scaffold(
appBar: AppBar(
title: Text('Error'),
),
body: Center(
child: Text('ERROR'),
),
);
);
class InitialRouteGenerator
static Route<dynamic> generateRoute(RouteSettings settings)
bool _firstTimeAppUsed;
final localStorage = new SharedPreferenceService();
localStorage.isFirstTimeAppUsed().then((bool value)
if (value == true)
_firstTimeAppUsed = true;
);
if (_firstTimeAppUsed)
return MaterialPageRoute(builder: (_) => SignUpSelectionScreen());
return MaterialPageRoute(builder: (_) => HomePage());
AuthWidget.dart
class AuthWidget extends StatelessWidget
static const id = "auth_widget";
@override
Widget build(BuildContext context)
print("Auth Widget...");
final authService =
Provider.of<FirebaseAuthService>(context, listen: false);
final userModel = Provider.of<UserModel>(context, listen: false);
final signInHelperService = Provider.of<SignInHelperService>(context, listen: false);
return StreamBuilder(
stream: authService.onAuthStateChanged,
builder: (context, snapshot)
if (snapshot.connectionState == ConnectionState.active)
print ("INSIDE AUTH WIDGET");
final user = snapshot.data;
if (user != null)
print("$user.uid $user.userName $user.photoUrl");
userModel.user = user;
return StreamBuilder(
stream: FirebaseFirestore.instance
.collection('users')
.doc(user.uid)
.get().asStream(),
builder: (context, userSnapshot)
if (userSnapshot.hasData && snapshot.connectionState == ConnectionState.active)
final userDocument = userSnapshot.data;
if (userDocument != null)
print("------ Data Found -------");
AppUser user = AppUser.fromMap(userDocument);
//bool signUpComplete = userDocument["signUpComplete"];
bool signUpComplete = user.signUpComplete;
if (signUpComplete == null) signUpComplete = false;
if (!signUpComplete)
print("userModel.user UID $userModel.user.uid");
return SignupForm();
else
AppUser user2 = AppUser.fromMap(userDocument);
userModel.user = user2;
print('User Level ..... $userModel.user.userLevel');
signInHelperService.getAndUpdateDeviceToken(user2);
return HomePage(); //MainPage();
return emptyScaffoldWithProgress();
);
return SignUpSelectionScreen();
return emptyScaffoldWithProgress();
);
Scaffold emptyScaffoldWithProgress()
return Scaffold(
body: Center(
child: SizedBox(
height: 90,
width: 90,
child: CircularProgressIndicator(
strokeWidth: 5.0,
valueColor: AlwaysStoppedAnimation<Color>(Colors.redAccent)),
),
),
);
颤振医生-v
[√] Flutter (Channel stable, 1.22.4, on Microsoft Windows [Version 10.0.19041.630], locale en-US)
• Flutter version 1.22.4 at C:\src\flutter
• Framework revision 1aafb3a8b9 (3 weeks ago), 2020-11-13 09:59:28 -0800
• Engine revision 2c956a31c0
• Dart version 2.10.4
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
• Android SDK at C:\Users\Jamal\AppData\Local\Android\sdk
• Platform android-29, build-tools 29.0.3
• Java binary at: C:\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
• All Android licenses accepted.
[√] Android Studio (version 4.0)
• Android Studio at C:\Android\Android Studio
• Flutter plugin version 47.1.2
• Dart plugin version 193.7361
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
[√] VS Code (version 1.51.1)
• VS Code at C:\Users\Jamal\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.17.0
[√] Connected device (1 available)
• Android SDK built for x86 (mobile) • emulator-5554 • android-x86 • Android 10 (API 29) (emulator)
• No issues found!
【问题讨论】：
找到罪魁祸首，是 DevicePreview 导致在热重载时执行 runApp。我不知道为什么现在它工作正常。我现在已经删除了。希望它可以帮助某人。 【参考方案1】：我找到了罪魁祸首，是 DevicePreview 导致在热重载时执行 runApp。我不知道为什么现在它工作正常。我现在已经删除了。
【讨论】：
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