home_page.dart

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  String mode = 'Light';
  bool isDark = false;

  @override
  Widget build(BuildContext context) {
    final themeNotifier = Provider.of<ThemeNotifier>(context);

    return Scaffold(
        body: Stack(
      children: <Widget>[
        Center(child: Text('Mode is: ' + mode)),
        Align(
            alignment: Alignment.topLeft,
            child: Padding(
              padding: const EdgeInsets.all(40.0),
              child: Switch(
                  value: isDark,
                  onChanged: (bool newVal) {
                    setState(() {
                      isDark = newVal;
                    });
                    if (isDark) {
                      mode = 'Dark';
                      themeNotifier.setTheme(darkTheme);
                    } else {
                      mode = 'Light';
                      themeNotifier.setTheme(lightTheme);
                    }
                  }),
            ))
      ],
    ));
  }
}