Keep global ThemeData across screens - flutter

Question

Is it possible to set ThemeData globally so you don't have to on the next screens?
Currently after I use the Navigator.pushI have to make sure the new screen Widget have instructions like Theme.of(context).backgroundColor
Is there a way for the app screens/widgets to automatically pick whatever is set in the main.dart theme?
Eg, Here is my main.dart
class MyApp extends StatelessWidget {
const MyApp({super.key});
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(backgroundColor: Colors.red, primaryColor: Colors.green),
home: LoadingScreen(),
);
}
}
and this is the loadingscreen:
class _LoadingScreenState extends State<LoadingScreen> {
#override
void initState() {
super.initState();
getFiles();
}
void getFiles() async {
await Future.delayed(Duration(seconds: 3));
Navigator.push(context, MaterialPageRoute(builder: (context) {
return StartScreen(file: null);
}));
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
color: Theme.of(context).backgroundColor,
child: Center(
child: Image.asset(
height: 100.0,
)),
),
);
}
}
Without a Theme.of(context).backgroundColor in the Container, the app will load a white page behind the image, instead of red as defined in the ThemeData.
Is that a way to avoid the extensive usage of Theme.of(context).backgroundColor everywhere?

Answer 1

When you set the Scaffolds backgroundcolor in the ThemeData every Scaffold should use that color as a backgroundcolor. On your LoadingScreen the extra Container is unecessery since it would override the Scaffolds backgroundcolor.
Refer to this answer on how to set the backgroundcolor: https://stackoverflow.com/a/55581726/13406356