useMaterial property
      
      bool
      get
      useMaterial
      
    
    
Indicates if the App is running the Material interface theme.
Implementation
static bool get useMaterial =>
    (_appState != null && _appState!.useMaterial!) ||
    (UniversalPlatform.isAndroid &&
        (_appState == null || !_appState!.switchUI!)) ||
    (UniversalPlatform.isIOS && (_appState == null || _appState!.switchUI!));