jamesmontemagno/Xamarin.Plugins

    private async void OnGeoLocationStartTrackingClicked(object sender, EventArgs e)
    {
        var status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Location);
        if (status != PermissionStatus.Granted)
        {
            if (await CrossPermissions.Current.ShouldShowRequestPermissionRationaleAsync(Permission.Location))
            {
                await DisplayAlert("Need location", "TruckerApp need that location", "OK");
            }

            var results = await CrossPermissions.Current.RequestPermissionsAsync(new[] {Permission.Location});
            status = results[Permission.Location];
        }

        if (status == PermissionStatus.Granted)
        {
            if (CrossGeolocator.Current.IsListening)
                return;

            if (!CrossGeolocator.Current.IsGeolocationAvailable)
            {
                await DisplayAlert("GPS Start", "GPS ist auf Ihrem Gerät nicht verfügbar.", "Ok");

                return;
            }

            if (!CrossGeolocator.Current.IsGeolocationEnabled)
            {
                await
                    DisplayAlert("GPS Start",
                        "GPS ist auf Ihrem Gerät nicht aktiviert. Prüfen Sie die Einstellungen am Phone.", "Ok");
                return;
            }

            if (!CrossGeolocator.Current.SupportsHeading)
            {
                //await DisplayAlert("GPS Start", "GPS Heading ist auf Ihrem Gerät nicht verfügbar.", "Ok");
                //return;
            }

            GeoLocationInfoButton.Text = "Stop GPS";
            GeoLocationInfoButton.Clicked -= OnGeoLocationStartTrackingClicked;
            GeoLocationInfoButton.Clicked += OnGeoLocationStopTrackingClicked;
            GeoLocationPanel.IsVisible = true;

            CrossGeolocator.Current.DesiredAccuracy = 1;
            GeoLocationStatusLabel.Text = "Getting gps";
            CrossGeolocator.Current.PositionChanged += (o, args) =>
            {
                var position = args.Position;

                var geoLocalTime = GetGeoLocalUtcTime(position);
                var speedInKmPerHour = GetSpeedInKilometerPerHour(position);

                GeoLocationStatusLabel.Text =
                    $"Time: {geoLocalTime}\n" +
                    $"Lat: {position.Latitude}\n" +
                    $"Long: {position.Longitude}\n" +
                    $"Altitude: {position.Altitude} m\n" +
                    $"Altitude Accuracy: {position.AltitudeAccuracy} m\n" +
                    $"Accuracy: {position.Accuracy} m\n" +
                    $"Heading: {position.Heading} ° (Grad abweichend von Nord) \n" +
                    $"Speed: {speedInKmPerHour} km/h";
            };

            CrossGeolocator.Current.PositionError += async (o, args) =>
            {
                var error = args?.Error;

                await DisplayAlert("GPS Fehler", $"Fehler : {error}", "Ok");
            };

            //minTime in msec, minDistance in meter see https://blog.xamarin.com/geolocation-for-ios-android-and-windows-made-easy/
            bool result =
                await CrossGeolocator.Current.StartListeningAsync(minTime: 1, minDistance: 1, includeHeading: true);

            if (!result)
            {
                await DisplayAlert("GPS Start", "GPS Tracking konnte nicht gestarted werden", "Ok");
                return;
            }
        }
        else
        {
            await DisplayAlert("GeoLocation Info", $"Geo Location nicht verfügbar. Status:{status}", "OK");

            if (Device.OS == TargetPlatform.iOS)
            {
                //On iOS you may want to send your user to the settings screen.
                CrossP