Backgrounding service sample for Android

TimeTrackingService.cs

using System;
using System.Timers;
using Android.App;
using Android.Content;
using Android.OS;

namespace SampleBackgroundServices.Droid
{
    public class TimeTrackingService : Service
    {
        // Declare a timer which will fire every minute
        private Timer TimeTracker = new Timer(5000);

        public EventHandler<ElapsedEventArgs> TimerElapsed;

        public override IBinder OnBind(Intent intent)
        {
            return new TimeTrackingServiceBinder(this);
        }

        public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
        {
            TimeTracker.Elapsed += TimeTracker_Elapsed;
            TimeTracker.Start();

            return StartCommandResult.Sticky;
        }

        public override void OnDestroy()
        {
            TimeTracker.Elapsed -= TimeTracker_Elapsed;
            base.OnDestroy();
        }

        private void TimeTracker_Elapsed(object sender, ElapsedEventArgs e)
        {
            TimerElapsed(this, e);
        }
    }

    public class TimeTrackingServiceBinder : Binder
    {
        public TimeTrackingService Service { get; private set; }
        public TimeTrackingServiceBinder(TimeTrackingService pService)
        {
            this.Service = pService;
        }
    }
}