飞镖 – 颤动：如何防止设备方向改变并强制纵向？

例：

class MyApp extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      SystemChrome.setPreferredOrientations([
        DeviceOrientation.porTraitUp,DeviceOrientation.porTraitDown,]);
      return new MaterialApp(...);
    }
  }