[Flutter] Flutter Text Color Theme doesn't work under ListTile title

I am getting started in Flutter and just trying out stuff. I set a custom theme, but Text Widgets under the title property of ListTile don't get the right color. Also Icons under the leading property don't get the right color as well.

I tried setting some other colors, and sorted out, that the Problem only exists within that element.

class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'MyApp',
theme: ThemeData(
primaryColor: Colors.black,
scaffoldBackgroundColor: Color(0xff202020),
cardTheme: CardTheme(color: Colors.black),
textTheme: TextTheme(
body1: TextStyle(color: Colors.white),
subtitle: TextStyle(color: Colors.white),
headline: TextStyle(color: Colors.white)),
iconTheme: IconThemeData(color: Colors.white)),
home: HomePage(),
);
}
}

class HomePage extends StatefulWidget {
@override
HomePageState createState() => new HomePageState();
}

class HomePageState extends State<HomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("HomePage"),
leading: IconButton(
icon: Icon(Icons.arrow_back_ios),
tooltip: "back to the last page.",
onPressed: () {
Navigator.pop(context);
})
),
body: Card(
child: ListTile(
title: Text("Test"),
leading: new Icon(Icons.devices)
),
));
}
}


The Text for the title should appear white as well as the icon, instead it is black. All other Text is white.

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