MonoGame.Samples/RockRain/Platforms/Android/MainActivity.cs

using Android.App;
using Android.Content.PM;
using Android.OS;
using Android.Views;
using Microsoft.Xna.Framework;

namespace RockRain.Android
{
    [Activity(
        Label = "RockRain",
        MainLauncher = true,
        AlwaysRetainTaskState = true,
        LaunchMode = LaunchMode.SingleInstance,
        ScreenOrientation = ScreenOrientation.FullUser,
        ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.Keyboard | ConfigChanges.KeyboardHidden | ConfigChanges.ScreenSize | ConfigChanges.ScreenLayout)]
    public class MainActivity : AndroidGameActivity
    {
        private Game1 game;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            game = new Game1();
            SetContentView((View)game.Services.GetService(typeof(View)));
            game.Run();
        }
    }
}