Android - Enforce Screen Orientation

MainActivity.cs

namespace TestApp.Droid
{
  [Activity(Label = "TestApp",
            Icon = "@drawable/icon",
            Theme = "@style/MyTheme",
            ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation,
            NoHistory = true)]
  public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
  {
    protected override void OnCreate(Bundle bundle)
    {
      // Lock orientation depending on device type
      switch (Xamarin.Forms.Device.Idiom)
      {
        case TargetIdiom.Phone:
          RequestedOrientation = ScreenOrientation.Portrait;
          break;
        case TargetIdiom.Tablet:
          RequestedOrientation = ScreenOrientation.Landscape;
          break;
        case TargetIdiom.Desktop:
        default:
          RequestedOrientation = ScreenOrientation.Unspecified;
          //RequestedOrientation = ScreenOrientation.Landscape;
          break;
      }

      base.OnCreate(bundle);

      LoadApplication(new App());
    }
  }
}