<resources>
  <style name="Theme.Splash" parent="android:Theme">
    <item name="android:windowBackground">@drawable/splash</item>
    <item name="android:windowNoTitle">true</item>
  </style>
</resources>

namespace SplashScreen
{
    using System.Threading;

    using Android.App;
    using Android.OS;

    [Activity(Theme = "@style/Theme.Splash", MainLauncher = true, NoHistory = true)]
    public class SplashActivity : Activity
    {
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);
            Thread.Sleep(10000); // Simulate a long loading process on app startup.
            StartActivity(typeof(Activity1));
        }
    }
}