static async Task <Location> PlatformLastKnownLocationAsync()
{
await Permissions.EnsureGrantedOrRestrictedAsync <Permissions.LocationWhenInUse>();
var lm = Platform.LocationManager;
AndroidLocation bestLocation = null;
foreach (var provider in lm.GetProviders(true))
{
var location = lm.GetLastKnownLocation(provider);
if (location != null && IsBetterLocation(location, bestLocation))
{
bestLocation = location;
}
}
return(bestLocation?.ToLocation());
}
static async Task <Location> PlatformLocationAsync(GeolocationRequest request, CancellationToken cancellationToken)
{
await Permissions.EnsureGrantedOrRestrictedAsync <Permissions.LocationWhenInUse>();
var locationManager = Platform.LocationManager;
var enabledProviders = locationManager.GetProviders(true);
var hasProviders = enabledProviders.Any(p => !ignoredProviders.Contains(p));
if (!hasProviders)
{
throw new FeatureNotEnabledException("Location services are not enabled on device.");
}
// get the best possible provider for the requested accuracy
var providerInfo = GetBestProvider(locationManager, request.DesiredAccuracy);
// if no providers exist, we can't get a location
// let's punt and try to get the last known location
if (string.IsNullOrEmpty(providerInfo.Provider))
{
return(await GetLastKnownLocationAsync());
}
var tcs = new TaskCompletionSource <AndroidLocation>();
var allProviders = locationManager.GetProviders(false);
var providers = new List <string>();
if (allProviders.Contains(LocationManager.GpsProvider))
{
providers.Add(LocationManager.GpsProvider);
}
if (allProviders.Contains(LocationManager.NetworkProvider))
{
providers.Add(LocationManager.NetworkProvider);
}
if (providers.Count == 0)
{
providers.Add(providerInfo.Provider);
}
var listener = new SingleLocationListener(locationManager, providerInfo.Accuracy, providers);
listener.LocationHandler = HandleLocation;
cancellationToken = Utils.TimeoutToken(cancellationToken, request.Timeout);
cancellationToken.Register(Cancel);
// start getting location updates
// make sure to use a thread with a looper
var looper = Looper.MyLooper() ?? Looper.MainLooper;
foreach (var provider in providers)
{
locationManager.RequestLocationUpdates(provider, 0, 0, listener, looper);
}
var androidLocation = await tcs.Task;
if (androidLocation == null)
{
return(null);
}
return(androidLocation.ToLocation());
void HandleLocation(AndroidLocation location)
{
RemoveUpdates();
tcs.TrySetResult(location);
}
void Cancel()
{
RemoveUpdates();
tcs.TrySetResult(listener.BestLocation);
}
void RemoveUpdates()
{
for (var i = 0; i < providers.Count; i++)
{
locationManager.RemoveUpdates(listener);
}
}
}
