RequestPermissionsAsync never returns - xamarin.forms

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);
}
}

Answer 1

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 .