How to play a simple audio file with Xamarin iOS/Android

Question

I'm trying to learn and play a bit with Xamarin :) I wanted to play a simple sound at the end of a certain time and in part I succeeded, this works on the android and ios emulators but when I try to build the app on my iPhone this crush at the moment of sound reproduction!

the code I wrote I copied from here!

so my code is this:

iAudio.cs :

using System;
namespace StopWatch
{
    public interface IAudio
    {
        void PlayAudioFile(string fileName);
    }
}

AudioService.cs in Android :

using System;
using Xamarin.Forms;
using StopWatch.Droid;
using Android.Media;
using Android.Content.Res;

[assembly: Dependency(typeof(AudioService))]
namespace StopWatch.Droid
{
    public class AudioService : IAudio
    {
        public AudioService()
        { }
        public void PlayAudioFile(string fileName)
        {
            var player = new MediaPlayer();
            var fd = global::Android.App.Application.Context.Assets.OpenFd(fileName);
            player.Prepared += (s, e) =>
            {
                player.Start();
            };
            player.SetDataSource(fd.FileDescriptor, fd.StartOffset, fd.Length);
            player.Prepare();
        }
    }
}

AudioService.cs in iOS:

using System; using Xamarin.Forms; using StopWatch; using StopWatch.iOS; using System.IO; using Foundation; using AVFoundation; [assembly: Dependency(typeof(AudioService))] namespace StopWatch.iOS {
    public class AudioService : IAudio
    {
        public AudioService()
        { }
        public void PlayAudioFile(string fileName)
        {
            string sFilePath = NSBundle.MainBundle.PathForResource(Path.GetFileNameWithoutExtension(fileName), Path.GetExtension(fileName));
            NSUrl url = NSUrl.FromString(sFilePath);
            var _player = AVAudioPlayer.FromUrl(url);
            _player.FinishedPlaying += (object sender, AVStatusEventArgs e) =>
            {
                _player = null;
            };
            _player.Play();
        }
    } 
}

and this is mi MainPage.xaml.cs :

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace StopWatch
{
    // Learn more about making custom code visible in the Xamarin.Forms previewer
    // by visiting https://aka.ms/xamarinforms-previewer
    [DesignTimeVisible(false)]
    public partial class MainPage : ContentPage
    {
        Stopwatch stopwatch;
        public MainPage()
        {
            InitializeComponent();
            stopwatch = new Stopwatch();
            lblStopWatch.Text = "00:00:00";
            lblStopWatchAllert.Text = "";
        }

        private void btnStartClicked(object sender, EventArgs e)
        {
            stopwatch.Start();
            Device.StartTimer(TimeSpan.FromMilliseconds(10), () =>
            {
                lblStopWatch.Text = stopwatch.Elapsed.ToString().Substring(0, 8);
                controll(lblStopWatch.Text);
                return true;

            });
        }

        private void btnStopClicked(object sender, EventArgs e)
        {
            stopwatch.Stop();
        }

        private void btnResetClicked(object sender, EventArgs e)
        {
            stopwatch.Reset();
        }

        private void controll(String time)
        {
            if (string.Compare(time, "00:00:03:0000") > 0)
            {

                stopwatch.Reset();
                lblStopWatchAllert.Text = "time is over!";

                DependencyService.Get<IAudio>().PlayAudioFile("Alert.mp3");

            }
        }

    }
}

the code crashes me at this point of the iOS AudioService.cs file:

I think the problem lies in the info.plist (although I am most likely wrong) but I don't know how to solve it :( can someone help me? thank you

Answer 1

I have checked this code , it works in my site . Invoking the play method as follow :

DependencyService.Get<IAudio>().PlayAudioFile("Alan_Walker.mp3");

The other codes are the same with yours in iOS and Android , they all play the sound successfully.

Here you need to notice that ,the local sound file should be added to each platform .And each platform has its specical folder to put the auido file .

In Android , you need to put it in Assets folder as follow :

And in iOS , you need to put it in Resources folder as follow :

==========================Update===================================

You should first add file to this folder as follow :

Then add Existing file to this folder :

Then when installing app , this filw will be added to mobile . No matter what is a simulator or a physical device.

Note :

Not copying file from other path to Xamarin.iOS project , this can't make sure the file be added to the project .