I am creating a xamarin form app which require user location after every 10 meter. I am able to get location when app is running in foreground but unable to get location when app get into background
1 Replies
You can do it with device timer. The timer will run periodically & will check for location updates and notify if location updated. I have used Xam.Plugins.Notifier to generate local notification on location update.
Here is the code for it :
public partial class MainPage : ContentPage
{
Location oldLocation = null;
CancellationTokenSource cts;
public MainPage()
{
InitializeComponent();
Device.StartTimer(TimeSpan.FromSeconds(10), () =>
{
GetCurrentLocation();
return true;
});
}
protected async override void OnAppearing()
{
base.OnAppearing();
await GetCurrentLocation();
}
async Task GetCurrentLocation()
{
try
{
var request = new GeolocationRequest(GeolocationAccuracy.Medium, TimeSpan.FromSeconds(10));
cts = new CancellationTokenSource();
var location = await Geolocation.GetLocationAsync(request, cts.Token);
if (location != null)
{
Debug.WriteLine($"Latitude: {location.Latitude}, Longitude: {location.Longitude}, Altitude: {location.Altitude}");
if (oldLocation == null)
{
oldLocation = location;
map.MoveToRegion(MapSpan.FromCenterAndRadius(
new Position(location.Latitude, location.Longitude), Distance.FromMiles(0.3)));
}
if (location.Latitude != oldLocation.Latitude || location.Longitude != oldLocation.Longitude)
{
map.MoveToRegion(MapSpan.FromCenterAndRadius(
new Position(location.Latitude, location.Longitude), Distance.FromMiles(0.3)));
oldLocation = location;
double zoomLevel = 0.5;
double latlongDegrees = 360 / (Math.Pow(2, zoomLevel));
if (map.VisibleRegion != null)
{
map.MoveToRegion(new MapSpan(map.VisibleRegion.Center, latlongDegrees, latlongDegrees));
}
var placemarks = await Geocoding.GetPlacemarksAsync(location.Latitude, location.Longitude);
var placemark = placemarks?.FirstOrDefault();
if (placemark != null)
{
var geocodeAddress =
$"AdminArea: {placemark.AdminArea}\n" +
$"CountryCode: {placemark.CountryCode}\n" +
$"CountryName: {placemark.CountryName}\n" +
$"FeatureName: {placemark.FeatureName}\n" +
$"Locality: {placemark.Locality}\n" +
$"PostalCode: {placemark.PostalCode}\n" +
$"SubAdminArea: {placemark.SubAdminArea}\n" +
$"SubLocality: {placemark.SubLocality}\n" +
$"SubThoroughfare: {placemark.SubThoroughfare}\n" +
$"Location : {placemark.Location}\n" +
$"Thoroughfare: {placemark.Thoroughfare}\n";
Debug.WriteLine(geocodeAddress);
}
CrossLocalNotifications.Current.Show("Location Updated", "You checked in to " + placemark.FeatureName + " " + placemark.Locality + " " + placemark.SubLocality, 101, DateTime.Now.AddSeconds(5));
}
}
}
catch (FeatureNotSupportedException)
{
// Handle not supported on device exception
}
catch (FeatureNotEnabledException)
{
// Handle not enabled on device exception
}
catch (PermissionException)
{
// Handle permission exception
}
catch (Exception)
{
// Unable to get location
}
}
}