Xamarin.Android - Using NFC, and reading HEX id's

DroidNfcService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.Nfc;
using MyApp.Contract;
using MyApp.Contract.EventArgs;
using Xamarin.Forms;

namespace MyApp.Droid.Services
{
    class DroidNfcService : INfcService
    {
        private static DroidNfcService _instance;
        public static DroidNfcService Instance => _instance ?? (_instance = new DroidNfcService());

        private DroidNfcService()
        {
        }

        public event EventHandler<NfcEventArgs> NfcFound;

        internal void OnTagUuidFound(string idHex)
        {
            NfcFound?.Invoke(this, new NfcEventArgs(idHex));
        }
    }
}

INfcService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MyApp.Contract.EventArgs;

namespace MyApp.Contract
{
    public interface INfcService
    {
        event EventHandler<NfcEventArgs> NfcFound;
    }
}

MainActivity.cs

using System;
using System.Text;
using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.Nfc;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;

namespace MyApp.Droid
{
    [Activity( Label = "bmx", Icon = "@drawable/icon", Theme = "@style/MainTheme",
        ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation, LaunchMode = LaunchMode.SingleTop)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        protected override void OnCreate(Bundle bundle)
        {
            TabLayoutResource = Resource.Layout.Tabbar;
            ToolbarResource = Resource.Layout.Toolbar;
            base.OnCreate(bundle);       
            Window.AddFlags(WindowManagerFlags.DrawsSystemBarBackgrounds);
            Window.SetStatusBarColor(Android.Graphics.Color.Black);

            global::Xamarin.Forms.Forms.Init(this, bundle);
            LoadApplication(new App()); // Xamarin.Forms app
        }

        protected override void OnResume()
        {
            base.OnResume();
            SetupNfc();
        }

        private void SetupNfc()
        {
            var adapter = NfcAdapter.GetDefaultAdapter(Application.Context);

            var tagDetected = new IntentFilter(NfcAdapter.ActionTagDiscovered); 
            var filters = new[] { tagDetected };

            var intent = new Intent(this, this.GetType()).AddFlags(ActivityFlags.SingleTop);
            var pendingIntent = PendingIntent.GetActivity(this, 0, intent, 0);

            adapter.EnableForegroundDispatch(this, pendingIntent, filters, null);
        }

        protected override void OnNewIntent(Intent intent)
        {
            if (intent.Action == NfcAdapter.ActionTagDiscovered)
            {
                var tag = intent.GetParcelableExtra(NfcAdapter.ExtraTag) as Tag;
                if (tag != null)
                {
                    var idBytes = tag.GetId();
                    var id = idBytes.ToHexString();
                    // singleton handler class
                    DroidNfcService.Instance.OnTagUuidFound(id);
                }
            }
        }
    }
}

NfcEventArgs.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MyApp.Contract.EventArgs
{
    public class NfcEventArgs : System.EventArgs
    {
        public NfcEventArgs(string idHex)
        {
            IdHex = idHex;
        }

        public string IdHex { get; set; }
    }
}