Flutter: how to prevent device orientation changes and force portrait?

Question

I would like to prevent my application from changing its orientation and force the layout to stick to \"portrait\".

In the main.dart, I put:

void mai         


        

Answer 1

The 'setPreferredOrientations' method returns a Future object. Per documentation a Future represents some value that will be available somewhere in future. That's why you shall wait until it's available and then move on with the application. Hence, there shall be used 'then' method, which, per definition, "registers callbacks to be called when the Future completes". Hence, you shall use this code:

  void main() {
  SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]).then((_) {
      runApp(new App());
    });
   }

Also, the following file must be imported:

'package:flutter/services.dart'