The official example of Flutter for using a Theme and extend/override it, does not work as shown.
I used flutter upgrade and flutter doctor, so my Flutter is the newest and workes fine.
And the android emulator also works fine I guess.
I also restarted my PC, but it did not help.
I used the code from this site: https://flutter.dev/docs/cookbook/design/themes
The floatingActionButton should be yellow, but my button is cyan. So the override did not work. (I could add a picture if needed, but I think my Problem is clear. )
theme: ThemeData( // Define the default Brightness and Colors brightness: Brightness.dark, primaryColor: Colors.lightBlue, accentColor: Colors.cyan, // Define the default Font Family fontFamily: 'Montserrat', // Define the default TextTheme. Use this to specify the default // text styling for headlines, titles, bodies of text, and more. textTheme: TextTheme( headline: TextStyle(fontSize: 72.0, fontWeight: FontWeight.bold), title: TextStyle(fontSize: 36.0, fontStyle: FontStyle.italic), body1: TextStyle(fontSize: 14.0, fontFamily: 'Hind'), ), ),
floatingActionButton: Theme( data: Theme.of(context).copyWith(accentColor: Colors.yellow), child: FloatingActionButton( onPressed: null, child: Icon(Icons.add), ), ),