force portrait device orientation

Set a condition for runApp: 

SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp])
    .then((fn) {
  runApp(const MyApp());
});

But before the above line, you should add: 

WidgetsFlutterBinding.ensureInitialized();
Final code: 
WidgetsFlutterBinding.ensureInitialized();
SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp])
    .then((fn) {
  runApp(const MyApp());
});


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