How to get theme color inside the widget in Flutter

Issue

I have this:

Widget build(BuildContext context) {
    return MaterialApp(
      title: 'AnApp',
      theme: ThemeData(
        primarySwatch: Colors.blueGrey,
      ),
      home: MainWidget()
    );
  }
}

So I have set primarySwatch color to blueGrey. How can I access this color inside the MainWidget class?

I want to set a background the same as the AppBar color.

Solution

I'm not sure if there exist a way to use primarySwatch inside widget like that but if you are looking for AppBar color, it is actually the primaryColor and you can get it using

Color color = Theme.of(context).primaryColor;

Answered By - CopsOnRoad