flutter 动态主题颜色

class MainApp extends StatelessWidget {
  const MainApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      localizationsDelegates: const [
        GlobalMaterialLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate
      ],
      themeMode: ThemeMode.system,
      theme: ThemeData(
          colorScheme: ColorScheme.fromSeed(seedColor: Colors.indigo),
          useMaterial3: true,
          brightness: Brightness.light),
      darkTheme: ThemeData(
          colorSchemeSeed: Colors.blue,
          useMaterial3: true,
          brightness: Brightness.dark),
      supportedLocales: const [Locale("zh", "CN"), Locale("en", "US")],
      home: const HomePage(),
    );
  }
}