Question 288872 in Flutter Question posted in
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Dart Invalid constant value in builder: (context, child) when using flutter screenutil

Am completely new to flutter and as matter of fact this is my first bite in using it and I really can’t figure out why dart is yelling at me when using ScreenUtilInit from flutter_screenutil package, with invalid constant value error coming from builder: (context, child). I have searched everywhere on the web and read the pub documentation and i still couldn’t find tune how to appease these choking bug.

Here is the code snippets

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return const ScreenUtilInit(
      useInheritedMediaQuery: true,
      designSize: Size(375, 812),
      minTextAdapt: true,
      splitScreenMode: true,
      // The Invalid constant value is coming from the next line
      builder: (context, child){
        return const GetMaterialApp(
          debugShowCheckedModeBanner: false,
          title: "JobMon",
          theme: ThemeData(
            scaffoldBackgroundColor: kLight,
            iconTheme: IconThemeData(color: kDark),
            primaryColor: Colors.grey,
          ),
          home: defaultHome,
        );
      },
    );
  }
}

I will really appreciate some help here cause i don’t really know what am doing wrong here.

Tags:

2

Answers


  1. 0

    Remove the const keyword from GetMaterialApp widget.

    class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return const ScreenUtilInit(
      useInheritedMediaQuery: true,
      designSize: Size(375, 812),
      minTextAdapt: true,
      splitScreenMode: true,
      //Remove the const keyword
      builder: (context, child){
        return GetMaterialApp(
          debugShowCheckedModeBanner: false,
          title: "JobMon",
          theme: ThemeData(
            scaffoldBackgroundColor: kLight,
            iconTheme: IconThemeData(color: kDark),
            primaryColor: Colors.grey,
          ),
          home: defaultHome,
        );
      },
    );
  }
}
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  2. 0

    because of defaultHome, kLight and kDark are not const, you can’t define GetMaterialApp as const.

    class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const ScreenUtilInit(
      useInheritedMediaQuery: true,
      designSize: Size(375, 812),
      minTextAdapt: true,
      splitScreenMode: true,
      builder: (context, child){
        return GetMaterialApp(  // const removed
          debugShowCheckedModeBanner: false,
          title: "JobMon",
          theme: ThemeData(
            scaffoldBackgroundColor: kLight,
            iconTheme: IconThemeData(color: kDark),
            primaryColor: Colors.grey,
          ),
          home: defaultHome,
        );
      },
    );
  }
}
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