[Xamarin.Android] Permissions.RequestAsync never returns

Question

When I ask for recording permission at runtime, Permissions.RequestAsync never returns.

I added these lines to my MainActivity.cs files:

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);  
        }  

And I have this setup on another file to ask permission:

        private async Task<bool> AskRecordingPermissionAsync()  
        {  
            var status = await Permissions.CheckStatusAsync<Permissions.Microphone>();  
  
            if (status != PermissionStatus.Granted)  
                status = await Permissions.RequestAsync<Permissions.Microphone>();  
  
            return status == PermissionStatus.Granted;  
        }  
  
        public bool AskRecordingPermission()  
        {  
            bool hasRecordingPermission = true;  
  
            if (CURRENT_ANDROID_VERSION >= 23)  
            {  
                hasRecordingPermission = AskRecordingPermissionAsync().Result;  
            }  
  
            return hasRecordingPermission;  
        }  

I also asked for the static RECORD_AUDIO permission :

But when I step through the execution, it always blocks at Permissions.RequestAsync. I have a popup that appears to ask me to allow or disallow the permission. When I allow it, the application is stuck on a black screen. I have to restart the application to have it working properly once the permission accepted.

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

Please do not use .Result way to get the value. It will hang on your UI, you can get the value like following code with await .

   public partial class MainPage : ContentPage  
       {  
           public MainPage()  
           {  
               InitializeComponent();  
           }  
     
           private async void Button_Clicked(object sender, EventArgs e)  
           {  
               //Get the value from here.  
     
               var status=   await  AskRecordingPermission();  
           }  
     
           private async Task<bool> AskRecordingPermissionAsync()  
           {  
               var status = await Permissions.CheckStatusAsync<Permissions.Microphone>();  
     
               if (status != PermissionStatus.Granted)  
                   status = await Permissions.RequestAsync<Permissions.Microphone>();  
     
               return status == PermissionStatus.Granted;  
           }  
     
           public async Task<bool> AskRecordingPermission()  
           {  
              var hasRecordingPermission = await AskRecordingPermissionAsync();  
              return hasRecordingPermission;  
           }  
     
       }  

Best Regards,

Leon Lu

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