Android Issues Recording Audio in Xamarin using Plugin.AudioRecorder

Question

I have successfully utilised NateRickard's three year old Nuget Plugin.AudioRecorder to make audio recordings and play them back.
I have been careful to set both StopRecordingOnSilence and StopRecordingAfterTimeout to false to allow extended recordings that can only finish on a button click.
The app works perfectly on my physical iOS device, but not on my Android device.
I have a DisplayAlert that shows the file path to the newly recorded audio, which on the Android device comes up as blank.
I will post here my AudioPage.xaml.cs, MainActivity.cs and AndroidManifest.xml as I believe my issue lies somewhere here. Any help would be greatly appreciated.

AudioPage.xaml.cs

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
using System.Threading.Tasks;  
  
using Xamarin.Forms;  
using Xamarin.Forms.Xaml;  
using Xamarin.Essentials;  
using Plugin.AudioRecorder;  
  
namespace HandsFreeNotes.View  
{  
    [XamlCompilation(XamlCompilationOptions.Compile)]  
    public partial class AudioPage : ContentPage  
    {  
        private readonly AudioRecorderService audioRecorderService = new AudioRecorderService()  
        {   
            StopRecordingOnSilence = false,  
            StopRecordingAfterTimeout = false  
        };  
        private readonly AudioPlayer audioPlayer = new AudioPlayer();  
  
        public AudioPage()  
        {  
            // add a bit of padding to cater to the "notch" on the iPhone.  
            if (Device.RuntimePlatform == Device.iOS) { Padding = new Thickness(0, 40, 0, 0); }  
  
            InitializeComponent();  
        }  
  
        private async void BackButton_Clicked(object sender, EventArgs e)  
        {  
            await Navigation.PopModalAsync();  
        }  
  
        async void RecordNewAudio_Clicked(object sender, EventArgs e)  
        {  
            var status = await Permissions.RequestAsync<Permissions.Microphone>();  
  
            if (status != PermissionStatus.Granted)  
                return;  
  
            if (audioRecorderService.IsRecording)  
            {  
  
                await audioRecorderService.StopRecording();  
  
                AudioImage.Source = "flatlineblue.png";  
                RecordNewAudio.Text = "Record New Audio";  
                RecordNewAudio.TextColor = Color.Black;  
  
                try  
                {  
                    // Use default vibration length  
                    Vibration.Vibrate();  
                }  
                catch (FeatureNotSupportedException ex)  
                {  
                    // Feature not supported on device  
                    // await DisplayAlert("Alert", "Vibrate is not supported on this device", "Continue");  
                }  
                catch (Exception ex)  
                {  
                    // Other error has occurred.  
                    // await DisplayAlert("Alert", "Vibrate is not supported on this device", "Continue");  
                }  
  
                // audioPlayer.Play(audioRecorderService.GetAudioFilePath());  
                await DisplayAlert("Alert", "Recorded audio is at: " + audioRecorderService.GetAudioFilePath(), "Continue");  
            }  
            else  
            {  
                try  
                {  
                    // Use default vibration length  
                    Vibration.Vibrate();  
                }  
                catch (FeatureNotSupportedException ex)  
                {  
                    // Feature not supported on device  
                    // await DisplayAlert("Alert", "Vibrate is not supported on this device", "Continue");  
                }  
                catch (Exception ex)  
                {  
                    // Other error has occurred.  
                    // await DisplayAlert("Alert", "Vibrate is not supported on this device", "Continue");  
                }  
  
                AudioImage.Source = "audiocrop.gif";  
                RecordNewAudio.Text = "Recording... Press to Finish";  
                RecordNewAudio.TextColor = Color.Red;  
  
                await audioRecorderService.StartRecording();  
  
            }  
  
        }  
  
        private void PlaySelectedAudioButton_Clicked(object sender, EventArgs e)  
        {  
            try  
            {  
                Vibration.Vibrate();  
                audioPlayer.Play(audioRecorderService.GetAudioFilePath());  
            }  
            catch (Exception ex)  
            {  
                // an error has occurred.  
            }  
  
  
        }  
    }  
}  

MainActivity.cs

using System;  
  
using Android.App;  
using Android.Content.PM;  
using Android.Runtime;  
using Android.OS;  
using AndroidX.Core.Content;  
using Android;  
using AndroidX.Core.App;  
  
namespace HandsFreeNotes.Droid  
{  
    [Activity(Label = "HandsFreeNotes", Icon = "@drawable/hfn256x256", Theme = "@style/MainTheme", MainLauncher = false, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize )]  
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity  
    {  
        protected override void OnCreate(Bundle savedInstanceState)  
        {  
            base.OnCreate(savedInstanceState);  
  
            // Added these lines for RecordAudio Permissions per LeonLu-MSFT 22/07/2021  
  
            if (ContextCompat.CheckSelfPermission(this, Manifest.Permission.RecordAudio) != Permission.Granted)  
            {  
                ActivityCompat.RequestPermissions(this, new String[] { Manifest.Permission.RecordAudio }, 1);  
            }  
            // CrossMediaManager.Current.Init(this);  // I'm not using CrossMediaManager  
  
  
            Xamarin.Essentials.Platform.Init(this, savedInstanceState);  
            global::Xamarin.Forms.Forms.Init(this, savedInstanceState);  
            LoadApplication(new App());  
        }  
        public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)  
        {  
            Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);  
  
            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);  
        }  
    }  
}  

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>  
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="net.grime.apps.handsfreenotes">  
    <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="30" />  
    <application android:label="HandsFreeNotes.Android" android:theme="@style/MainTheme"></application>  
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />  
  
  <!--  Added these lines to cater to collecting Geolocation through Xamarin Essentials. GMB 11/06/2021, then 25/06/2021  
    https://learn.microsoft.com/en-us/xamarin/essentials/geolocation?context=xamarin%2Fxamarin-forms&tabs=android-->  
    
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />  
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />  
    <uses-feature android:name="android.hardware.location" android:required="false" />  
    <uses-feature android:name="android.hardware.location.gps" android:required="false" />  
    <uses-feature android:name="android.hardware.location.network" android:required="false" />   
      
  <!-- Added the following lines to allow for the sending of email through Xamarin Essentials. GMB 13/05/2021  
      https://learn.microsoft.com/en-us/xamarin/essentials/email?context=xamarin%2Fxamarin-forms&tabs=android -->    
    
  <queries>  
    <intent>  
      <action android:name="android.intent.action.SENDTO" />  
      <data android:scheme="mailto" />  
    </intent>  
  </queries>  
    
  <!-- Added the following lines to allow for the recording and playback of audio. GMB 07/07/2021  
      Gerald Versluis: https://www.youtube.com/watch?v=2V8J7v3FP78 -->  
  
  <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />  
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />  
  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />  
  <uses-permission android:name="android.permission.RECORD_AUDIO" />  
  
  <!-- Added the following lines to allow for Vibrate through Xamarin Essentials. GMB 08/07/2021  
      https://learn.microsoft.com/en-us/xamarin/essentials/email?context=xamarin%2Fxamarin-forms&tabs=android -->  
  
  <uses-permission android:name="android.permission.VIBRATE" />  
  
</manifest>  



  

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

I test await DisplayAlert("Alert", "Recorded audio is at: " + audioRecorderService.GetAudioFilePath(), "Continue");, I get the empty path as well.

But I use await DisplayAlert("Alert", "Recorded audio is at: " + recorder.FilePath, "Continue"); I can get the file path. (Note: recorder is the same as your audioRecorderService )

Best Regards,

Leon Lu

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