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

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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
          .of(context)
          .primaryTextTheme
          .apply(bodyColor: Colors.white)),
  home: Scaffold(
    appBar: AppBar(
      title: Text("Theme Demo"),
      leading: IconButton(
        onPressed: (){},
        icon: Icon(Icons.menu),
      ),
    ),
    floatingActionButton: FloatingActionButton(
      child: Icon(Icons.add),
    ),
  ),
);

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