我正在开发一个使用Xamarin表单的Android和iOS应用程序。目前，当应用程序启动时，在我的闪屏前显示一个白色屏幕。我们如何删除白色屏幕，直接显示闪屏？
App.xaml.cs

MainPage = new NavigationPage(new SplashScreen());

MainActivity.cs

{
    [Activity(Label = "testApp", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize )]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity, ActivityCompat.IOnRequestPermissionsResultCallback
    {
 protected override void OnCreate(Bundle savedInstanceState)
        {
            base.SetTheme(Resource.Style.MainTheme);

            base.OnCreate(savedInstanceState);
}
}