RequestPermissionsAsync never returns

Question

I am using the permissions plugin for Xamarin Forms . When i call RequestPermissionsAsync the call seems stuck forever . The next line is never called . I am doing the setup correct exactly as the documentation . That is my code

var result = await CrossPermissions.Current.RequestPermissionsAsync(Permission.Location, Permission.Camera, Permission.Microphone, Permission.Storage);

Console.WriteLine(result) //this line is never called

Below is the manifest

<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="28" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="com.commonground.streetdeploy.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.BATTERY_STATS" />
<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" />

<application android:label="Street Deploy" android:allowBackup="false" android:icon="@mipmap/icon">

    <provider android:name="android.support.v4.content.FileProvider" 
          android:authorities="com.commonground.streetdeploy.fileprovider" 
          android:exported="false" android:grantUriPermissions="true">
        <meta-data android:name="android.support.FILE_PROVIDER_PATHS"
             android:resource="@xml/file_paths"></meta-data>
    </provider>
     <!--<meta-data android:name="com.google.android.geo.API_KEY" android:value="xxx" />
         <meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="xxx" />
     <meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="xxx" /> 
     <meta-data android:name="com.google.android.geo.API_KEY" android:value="xxx" />--> 
</application>

This is the main Activity

[Activity(Label = "Street Deploy", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)] public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity { protected async override void OnCreate(Bundle savedInstanceState) { TabLayoutResource = Resource.Layout.Tabbar; ToolbarResource = Resource.Layout.Toolbar;

        base.OnCreate(savedInstanceState);


        /////////////////////////my code 





        await Plugin.Media.CrossMedia.Current.Initialize();




        Xamarin.FormsGoogleMaps.Init(this, savedInstanceState);

        UserDialogs.Init(this);

        Xamarin.Essentials.Platform.Init(this, savedInstanceState);



        /////////////////////////end my code 

        global::Xamarin.Forms.Forms.Init(this, savedInstanceState);

Plugin.CurrentActivity.CrossCurrentActivity.Current.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);
    }
}

Lucas Zhang Lucas Zhang · Accepted Answer · 2019-07-05T06:06:06

Make sure that you have add user permission in specific platforms .

in iOS (info.plist)

<key>NSAppleMusicUsageDescription</key>
<string>App want to access your Music </string>    
<key>NSCameraUsageDescription</key>
<string>App want to access your Camera</string>
<key>NSMicrophoneUsageDescription</key>
<string>App want to access your Microphone</string>  
<key>NSPhotoLibraryUsageDescription</key>
<string>App want to access your PhotoLibrary</string>

in Android (Manifest.xml)

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.CAMERA" />

And the line

Console.WriteLine(result);

will been called when you agree or reject the apply .

RequestPermissionsAsync never returns

1 Answers