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a: null-safetySupport for Dart's null safety featured: api docsIssues with https://api.flutter.dev/d: examplesSample code and demosf: routesNavigator, Router, and related APIs.found in release: 2.0Found to occur in 2.0frameworkflutter/packages/flutter repository. See also f: labels.has reproducible stepsThe issue has been confirmed reproducible and is ready to work on
Description
What am I trying to do?
As usual, I am trying to sending data from one screen to anotheronGenerateRoute() but I screen does not accept arguments type and showing errorThe argument type 'Object?' can't be assigned to the parameter type 'Map<String, dynamic>'.
I also tried to change the argument typeObject? on the receiver screen but now I am not able to extract data fromObject toMap<String, dynamic>. I think both are the same data type but the null-safety version is treated differently. I think this is a bug.
I have seenflutter official documentation for navigate-with-arguments and when I switched to null-safety inInteractive example section then it also showing error. See this screenshot or try it yourself.
It's working properly in the non-null-safety version of flutter
Here's the snippet
RouteGenerator Class
class RouteGenerator { static Route<dynamic> generateRoute(RouteSettings settings) { // Getting arguments passed while calling Navigator.pushNamed final args = settings.arguments; switch (settings.name) { case HomeScreen.routeName: return MaterialPageRoute( builder: (context) => HomeScreen(), ); case LoginScreen.routeName: return MaterialPageRoute( builder: (context) => LoginScreen(), ); case VerifyFirebaseOtpScreen.routeName: return MaterialPageRoute( builder: (context) => VerifyFirebaseOtpScreen(data: args), // Here is the error: The argument type 'Object?' can't be assigned to the parameter type 'Map<String, dynamic>'. ); case AboutScreen.routeName: return MaterialPageRoute( builder: (context) => AboutScreen(), ); default: return MaterialPageRoute( builder: (context) => Scaffold( body: SafeArea( child: Center( child: Text('No route defined for ${settings.name}'), ), ), ), ); } }}VerifyFirebaseOtpScreen
class VerifyFirebaseOtpScreen extends StatelessWidget { static const String routeName = '/verify_firebase_otp_screen'; final Map<String, dynamic> data; const VerifyFirebaseOtpScreen({ Key? key, required this.data, }) : super(key: key); @override Widget build(BuildContext context) { return GestureDetector( onTap: () { FocusScope.of(context).unfocus(); }, child: Scaffold( body: Center( child: SingleChildScrollView( padding: const EdgeInsets.all(8.0), child: Container( width: double.infinity, child: VerifyFirebaseOtpScreenDataSection( mobile: '${data['mobile']}', ), ), ), ), ), ); }}Logs
abhishekkumar@Abhisheks-MacBook-Air ~ % flutter doctor -v[✓] Flutter (Channel beta, 2.1.0-12.2.pre, on macOS 11.2.3 20D91 darwin-x64, locale en-IN) • Flutter version 2.1.0-12.2.pre at /Users/abhishekkumar/flutter • Framework revision 5bedb7b1d5 (13 days ago), 2021-03-17 17:06:30 -0700 • Engine revision 711ab3fda0 • Dart version 2.13.0 (build 2.13.0-116.0.dev)[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2) • Android SDK at /Users/abhishekkumar/Library/Android/sdk • Platform android-30, build-tools 30.0.2 • ANDROID_HOME = /Users/abhishekkumar/Library/Android/sdk • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495) • All Android licenses accepted.[✓] Xcode - develop for iOS and macOS • Xcode at /Applications/Xcode.app/Contents/Developer • Xcode 12.4, Build version 12D4e • CocoaPods version 1.10.1[✓] Chrome - develop for the web • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome[✓] Android Studio (version 4.1) • Android Studio at /Applications/Android Studio.app/Contents • Flutter plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/9212-flutter • Dart plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/6351-dart • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)[✓] VS Code (version 1.51.1) • VS Code at /Applications/Visual Studio Code.app/Contents • Flutter extension version 3.17.0[✓] Connected device (3 available) • iPhone SE (1st generation) (mobile) • 035FA189-09FF-46B5-96AC-C34E8D068C21 • ios • com.apple.CoreSimulator.SimRuntime.iOS-14-4 (simulator) • macOS (desktop) • macos • darwin-x64 • macOS 11.2.3 20D91 darwin-x64 • Chrome (web) • chrome • web-javascript • Google Chrome 89.0.4389.90• No issues found!Metadata
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a: null-safetySupport for Dart's null safety featured: api docsIssues with https://api.flutter.dev/d: examplesSample code and demosf: routesNavigator, Router, and related APIs.found in release: 2.0Found to occur in 2.0frameworkflutter/packages/flutter repository. See also f: labels.has reproducible stepsThe issue has been confirmed reproducible and is ready to work on