Unable to resume activity when getting users response for permission - xamarin.android

Question

I'm trying to get user's permission to access their GPS. I'm not sure whether I have used it correctly because when i visit to that screen I get a crash with the error:
java.lang.RuntimeException: Unable to resume activity {com.SuppShoesTest.SuppShoesTest/md5056fe371b3902b2cc984ad5dda4f920b.gMaps}: android.util.SuperNotCalledException: Activity {com.SuppShoesTest.SuppShoesTest/md5056fe371b3902b2cc984ad5dda4f920b.gMaps} did not call through to super.onResume()
01-18 23:57:20.419 E/AndroidRuntime( 2712): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3103)
01-18 23:57:20.419 E/AndroidRuntime( 2712): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3134)
01-18 23:57:20.419 E/AndroidRuntime( 2712): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2481)
01-18 23:57:20.419 E/AndroidRuntime( 2712): at android.app.ActivityThread.-wrap11(ActivityThread.java)
01-18 23:57:20.419 E/AndroidRuntime( 2712): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
01-18 23:57:20.419 E/AndroidRuntime( 2712): at android.os.Handler.dispatchMessage(Handler.java:102)
01-18 23:57:20.419 E/AndroidRuntime( 2712): at android.os.Looper.loop(Looper.java:148)
01-18 23:57:20.419 E/AndroidRuntime( 2712): at android.app.ActivityThread.main(ActivityThread.java:5417)
01-18 23:57:20.419 E/AndroidRuntime( 2712): at java.lang.reflect.Method.invoke(Native Method)
01-18 23:57:20.419 E/AndroidRuntime( 2712): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
01-18 23:57:20.419 E/AndroidRuntime( 2712): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
01-18 23:57:20.419 E/AndroidRuntime( 2712): Caused by: android.util.SuperNotCalledException: Activity {com.SuppShoesTest.SuppShoesTest/md5056fe371b3902b2cc984ad5dda4f920b.gMaps} did not call through to super.onResume()
01-18 23:57:20.419 E/AndroidRuntime( 2712): at android.app.Activity.performResume(Activity.java:6314)
01-18 23:57:20.419 E/AndroidRuntime( 2712): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3092)
Here is my code
{
private GoogleMap maps;
string dman;
string date;
string time;
public static readonly EndpointAddress EndPoint = new EndpointAddress("http://192.168.1.3:9608/SuppShoes.svc");
private SuppShoesClient _client;
ArrayList postal;
double mylat;
double mylong;
Location _currentLocation;
LocationManager _locationManager;
LinearLayout layout;
string _locationProvider;
PolylineOptions rect = new PolylineOptions();
readonly string[] PermissionsLocation =
{
Manifest.Permission.AccessCoarseLocation,
Manifest.Permission.AccessFineLocation
};
const int RequestLocationId = 0;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.gMap);
layout = (LinearLayout)FindViewById(Resource.Id.layout);
InitializeHelloWorldServiceClient();
dman = Intent.GetStringExtra("Dman");
date = Intent.GetStringExtra("date");
time = Intent.GetStringExtra("Time");
InitializeLocationManager();
SetUpMap();
// Create your application here
}
private void InitializeHelloWorldServiceClient()
{
BasicHttpBinding binding = CreateBasicHttp();
_client = new SuppShoesClient(binding, EndPoint);
}
private static BasicHttpBinding CreateBasicHttp()
{
BasicHttpBinding binding = new BasicHttpBinding
{
Name = "basicHttpBinding",
MaxBufferSize = 2147483647,
MaxReceivedMessageSize = 2147483647
};
TimeSpan timeout = new TimeSpan(0, 0, 30);
binding.SendTimeout = timeout;
binding.OpenTimeout = timeout;
binding.ReceiveTimeout = timeout;
return binding;
}
public async void OnLocationChanged(Location location)
{
_currentLocation = location;
if (_currentLocation == null)
{
}
else
{
AddMarker();
}
}
public void OnProviderDisabled(string provider) { }
public void OnProviderEnabled(string provider) { }
public void OnStatusChanged(string provider, Availability status, Bundle extras) { }
protected override void OnResume()
{
const string permission = Manifest.Permission.AccessFineLocation;
if (CheckSelfPermission(permission) == (int)Permission.Granted)
{
base.OnResume();
_locationManager.RequestLocationUpdates(_locationProvider, 0, 0, this);
}
if (ShouldShowRequestPermissionRationale(permission))
{
//Explain to the user why we need to read the contacts
Android.Support.Design.Widget.Snackbar.Make(layout,"Location access is required to show coffee shops nearby.", Android.Support.Design.Widget.Snackbar.LengthIndefinite)
.SetAction("OK", v => RequestPermissions(PermissionsLocation, RequestLocationId))
.Show();
return;
}
//Finally request permissions with the list of permissions and Id
RequestPermissions(PermissionsLocation, RequestLocationId);
}
public override async void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults)
{
switch (requestCode)
{
case RequestLocationId:
{
if (grantResults[0] == Permission.Granted)
{
//Permission granted
var snack = Android.Support.Design.Widget.Snackbar.Make(layout, "Location permission is available, getting lat/long.", Android.Support.Design.Widget.Snackbar.LengthShort);
snack.Show();
base.OnResume();
}
else
{
//Permission Denied :(
//Disabling location functionality
var snack = Android.Support.Design.Widget.Snackbar.Make(layout, "Location permission is denied.", Android.Support.Design.Widget.Snackbar.LengthShort);
snack.Show();
}
}
break;
}
}
protected override void OnPause()
{
base.OnPause();
_locationManager.RemoveUpdates(this);
}
void InitializeLocationManager()
{
_locationManager = (LocationManager)GetSystemService(LocationService);
Criteria criteriaForLocationService = new Criteria
{
Accuracy = Accuracy.Fine
};
IList<string> acceptableLocationProviders = _locationManager.GetProviders(criteriaForLocationService, true);
if (acceptableLocationProviders.Any())
{
_locationProvider = acceptableLocationProviders.First();
}
else
{
_locationProvider = string.Empty;
}
}
void AddMarker()
{
RunOnUiThread(() =>
{
LatLng current = new LatLng(_currentLocation.Latitude, _currentLocation.Longitude);
MarkerOptions asd = new MarkerOptions();
asd.SetPosition(current);
asd.InvokeIcon(BitmapDescriptorFactory.FromResource(Resource.Drawable.green));
maps.AddMarker(asd);
rect.Add(current);
});
}
private void SetUpMap()
{
if(maps==null)
{
FragmentManager.FindFragmentById<MapFragment>(Resource.Id.googlemap).GetMapAsync(this);
}
}
public void OnMapReady(GoogleMap googleMap)
{
this.maps = googleMap;
LatLng latlng = new LatLng(Convert.ToDouble(1.3521), Convert.ToDouble(103.8198));
CameraUpdate camera = CameraUpdateFactory.NewLatLngZoom(latlng,10);
maps.MoveCamera(camera);
_client.getPostalAsync(dman, date, time);
_client.getPostalCompleted += _client_getPostalCompleted;
}
private void _client_getPostalCompleted(object sender, getPostalCompletedEventArgs e)
{
RunOnUiThread(() =>
{
foreach (var item in e.Result)
{
LatLng latlng = new LatLng(item.lat1, item.longi2);
MarkerOptions options = new MarkerOptions()
.SetPosition(latlng)
.SetTitle(item.companyname2)
.SetSnippet(item.DevID.ToString());
maps.AddMarker(options);
rect.Add(latlng);
Polyline polyline = maps.AddPolyline(rect);
}
});
}
}

Answer 1

For Xamarin forms, base.OnResume() need to be called to avoid this exception. As always, this need to be at the top of overridden OnResume() method.

Answer 2

As clear by your Exception Caused by: android.util.SuperNotCalledException, you must add super.onResume() to perform resume life cycle because your are #Overriding the method.
Call super inside onResume();:
super.onResume();