how to change text color of appbar, icon color of fab universally using theme?

Want to change text color of AppBar, icon color of FAB universally using theme? Here is the way you can set the AppBar Title color.

return new MaterialApp(
  theme: Theme.of(context).copyWith(
      accentIconTheme: Theme.of(context).accentIconTheme.copyWith(
        color: Colors.white
      accentColor: Colors.amber,
      primaryColor: Colors.amber,
      primaryIconTheme: Theme.of(context).primaryIconTheme.copyWith(
        color: Colors.white
      primaryTextTheme: Theme
          .apply(bodyColor: Colors.white)),
  home: Scaffold(
    appBar: AppBar(
      title: Text("Theme Demo"),
      leading: IconButton(
        onPressed: (){},
        icon: Icon(,
    floatingActionButton: FloatingActionButton(
      child: Icon(Icons.add),

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