dart - how to implement dark mode in flutter

Question

I want to create a flutter app that has 2 light and dark mode themes that change by a switch in-app and the default theme is default android theme.
I need to pass some custom color to the fellow widget and I don't want to just config material theme.

• how to detect the user device default theme?
• the secend question is how to provide a theme to the whole app?
• third is how change the theme with a simple switch in running time?

Answer 1

MaterialApp(
      title: 'App Title',
      theme: ThemeData(
        brightness: Brightness.light,
        /* light theme settings */
      ),
      darkTheme: ThemeData(
        brightness: Brightness.dark,
        /* dark theme settings */
      ),
      themeMode: ThemeMode.dark, 
      /* ThemeMode.system to follow system theme, 
         ThemeMode.light for light theme, 
         ThemeMode.dark for dark theme
      */
      debugShowCheckedModeBanner: false,
      home: YourAppHomepage(),
    );

You can use scoped_model or provider for seamless experience.