Timer in Xamarin.Forms
<p>I want to build my own audio player (as there no plugins available). I have used a slider to show progress of the player. I could allow user to go to specific location when the slider is moved but I can not synchronize it with the recording being played.</p>

<p><strong>Form</strong></p>

<pre><code>int i = 1;
Button btnPlay = new Button
{
    Text = "Play/Pause",
    Command = new Command(() =&gt;
    {
        DependencyService.Get&lt;IAudio&gt;().PlayMp3File();
        TimeSpan tmspan = new TimeSpan(00, 00, 00);
        label.Text = String.Format("{0:hh\\:mm\\:ss}", tmspan.Add(TimeSpan.FromMilliseconds(i)));
        i++;
        return true;
    })
};
Button btnStop = new Button { Text = "Stop" };
TimeSpan timeSpan = DependencyService.Get&lt;IAudio&gt;().GetInfo();
Label lblDuration = new Label { Text = String.Format("{0:hh\\:mm\\:ss}", timeSpan) };

var slider = new Slider {
    Minimum = 0,
    Maximum = timeSpan.TotalHours,
};
var label = new Label {
    Text = "Slider value is 0",
    FontSize = 25,
    HorizontalOptions = LayoutOptions.Start,
};
slider.ValueChanged += 
    (sender, e) =&gt; 
    {
        label.Text = String.Format("Slider value is {0:hh\\:mm\\:ss}", TimeSpan.FromMilliseconds(e.NewValue));
        DependencyService.Get&lt;IAudio&gt;().SeekTo(Convert.ToInt32(e.NewValue));
    };
MainPage = new ContentPage
{
    Content = new StackLayout 
    {
        Children = 
        {
            btnPlay,
            btnStop,
            slider,
            lblDuration,
            label
        }
    },  
    Padding = new Thickness (10, Device.OnPlatform (20, 0, 0), 10, 5)
};
</code></pre>

<p><strong>Service</strong></p>

<pre><code>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 AudioTest.Droid;
using Xamarin.Forms;
using Android.Media;
using System.Threading.Tasks;

[assembly: Dependency(typeof(AudioService))]

namespace AudioTest.Droid
{
    public class AudioService : IAudio
    {
        public AudioService() { }

        MediaPlayer player = null;

        public async Task StartPlayerAsync()
        {
            try
            {
                if (player == null)
                {
                    player = new MediaPlayer();
                    player = MediaPlayer.Create(global::Android.App.Application.Context, Resource.Raw.test);
                    player.Start();
                }
                else
                {
                    if (player.IsPlaying == true)
                    {
                        player.Pause();
                    }
                    else
                    {
                        player.Start();
                    }
                }
            }
            catch (Exception ex)
            {
                Console.Out.WriteLine(ex.StackTrace);
            }
        }

        public void StopPlayer()
        {
            if ((player != null))
            {
                if (player.IsPlaying)
                {
                    player.Stop();
                }
                player.Release();
                player = null;
            }
        }

        public async Task PlayMp3File()
        {
            await StartPlayerAsync();
        }

        public void Stop()
        {
            this.StopPlayer();
        }

        public async Task SeekTo( int s)
        {
            await seekTo(s);
        }

        public double CurrentPosition()
        {
            if ((player != null))
            {
                return player.CurrentPosition;
            }
            else
            { return 0; }
        }

        private async Task seekTo(int mseconds)
        {
            if (player == null)
            {
                player = new MediaPlayer();
                player = MediaPlayer.Create(global::Android.App.Application.Context, Resource.Raw.test);

            }

            player.SeekTo(mseconds);
            player.Start();
        }



        public TimeSpan GetInfo()
        {
            int arr;
            if (player == null)
            {
                player = new MediaPlayer();
                player = MediaPlayer.Create(global::Android.App.Application.Context, Resource.Raw.test);

            }
            arr = player.Duration;

            return TimeSpan.FromMilliseconds(arr);//TimeSpan.FromMilliseconds(arr).TotalMinutes;
        }
    }
}
</code></pre>

<p>Anyone has any idea on how to go about it?</p>

<p><em>Edit</em>
Screenshot of the screen
<a href="https://i.stack.imgur.com/wQ88A.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wQ88A.png" alt="enter image description here"></a></p>

<p>On play the timer should start and also my slider value should increment. On pause the timer and slider should be paused and on stop it should be stopped.</p>