No MediaQuery widget ancestor found. Scaffold widgets require a MediaQuery widget ancestor-CodePudding

I am new to flutter, BUILT an app showing graphs in flutter. When i run the code a red screen is appearing showing the above error 'No MediaQuery widget ancestor found. Scaffold widgets require a MediaQuery widget ancestor.' I have cleared all the erros except this one. Kindly help me fix this. The link of the code is attached below along with a Screenshot of error.

Regards

Full link of the code

link of screenshot error

CodePudding user response：

Check you main.dart, and in the MyApp (Or whatever you named it) class, you should wrap it with MaterialApp. It should fix the problem.

class MyApp extends StatelessWidget  {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Graphn',
      home: GraphScreen(),
    );
  }
}

CodePudding user response：

Wrap your scaffold to MatertialApp or you can make a class and in that class call GraphScreen like this

   void main() => runApp(const MyApp());
 
  class MyApp extends StatelessWidget {      
    @override
    Widget build(BuildContext context) {
      return MaterialApp(
  
        title: 'Flutter Demo',
        theme: ThemeData(
          primarySwatch: Colors.blue,
        ),
        home: GraphScreen(),
  
      );
    }
  }