Getting Access to Camera via Webview in Xamarin , Android, Webrtc

Question

Good Day All

i have a web page that i am accessing via Webview in Xamarin , Test URL

https://www.trovadating.com/Webview/GoLive.aspx?user_id=10383

and in my Android permission are as follows

<uses-permission android:name="android.permission.CAMERA" />  
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />  
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />  
<uses-permission android:name="android.permission.INTERNET" />   
<uses-permission android:name="android.permission.RECORD_AUDIO" />  
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />   
<uses-permission android:name="android.permission.MICROPHONE" />   
   <uses-permission android:name="android.permission.CAPTURE_AUDIO_OUTPUT" />  
   <uses-permission android:name="android.permission.CAPTURE_SECURE_VIDEO_OUTPUT" />  
  <uses-permission android:name="android.permission.CAPTURE_VIDEO_OUTPUT" />  
  <uses-feature android:name="android.hardware.camera" />  
  <uses-feature android:name="android.hardware.camera.autofocus" />  

 

but i am getting an error on my webrtc function that the camera is in use or it cant be used

connection.onMediaError = function(error, constraints) {  
        if (!!connection.enableLogs)  
        {  
            if (error == "Starting videoinput failed") {  
                alert("Your Camera is Already being used");  
            }  
            else  
            {  
                alert("Your Camera is Already being used");  
                console.error(error, constraints);  
            }  
        }  
    }  

Thanks

Answer 1

Hello,

Do you request these permissions when you application is running. If not, please add request permission code in your OnCreate method of MainActivity like following code. I use your test url, it is working in my side.

   public static MainActivity Instance;  
     
    protected async override void OnCreate(Bundle savedInstanceState)  
           {  
               base.OnCreate(savedInstanceState);  
               Instance = this;  
               Xamarin.Essentials.Platform.Init(this, savedInstanceState);  
               global::Xamarin.Forms.Forms.Init(this, savedInstanceState);  
     
     
     
               
               if (ContextCompat.CheckSelfPermission(MainActivity.Instance, Manifest.Permission.Camera) != Permission.Granted)  
               {  
     
     
     
                  await Permissions.RequestAsync<Permissions.Camera>();  
                   await Permissions.RequestAsync<Permissions.Microphone>();  
                   await Permissions.RequestAsync<Permissions.Media>();  
     
     
     
              }  
               LoadApplication(new App());  
           }  

Best Regards,

Leon Lu

---

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Answer 2

Good Day

i resolved the problem

on Page load where i want the streaming to happen i added this

 private async Task<bool> initPer()  
        {  
            var statusCamera = await Permissions.RequestAsync<Permissions.Camera>();  
            var statusMicrophone = await Permissions.RequestAsync<Permissions.Microphone>();  
            return statusCamera == PermissionStatus.Granted && statusMicrophone == PermissionStatus.Granted;  
        }  

and i created a renderer on the platfirm like this

[assembly: ExportRenderer(typeof(myapp.MyWebView), typeof(MyWebViewRenderer))]  
namespace myapp.Droid  
{   
    public class MyWebViewRenderer : WebViewRenderer  
    {  
        Activity mContext;  
        public MyWebViewRenderer(Context context) : base(context)  
        {  
            this.mContext = context as Activity;  
        }  
            protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.WebView> e)  
        {  
            base.OnElementChanged(e);  
            Control.Settings.JavaScriptEnabled = true;  
            Control.ClearCache(true);  
            Control.SetWebChromeClient(new MyWebClient(mContext));  
        }  
        public class MyWebClient : WebChromeClient  
        {  
            Activity mContext;  
            public MyWebClient(Activity context) {  
                this.mContext = context;  
            }  
            [TargetApi(Value = 21)]  
            public override void OnPermissionRequest(PermissionRequest request)  
            {  
                mContext.RunOnUiThread(() => {  
                        request.Grant(request.GetResources());  
                     
                        });  
                  
            }  
        }  
         
    }  

and used it like this

        <local1:MyWebView  
            x:Name="webLive"    
       HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"/>  

and also

public class MyWebView: WebView  
{  
}