async Task GetClosestAsync()
{
if (IsBusy || Monkeys.Count == 0)
{
return;
}
try
{
var location = await Geolocation.GetLastKnownLocationAsync();
if (location == null)
{
location = await Geolocation.GetLocationAsync(new GeolocationRequest
{
DesiredAccuracy = GeolocationAccuracy.Medium,
Timeout = TimeSpan.FromSeconds(30)
});
}
var first = Monkeys.OrderBy(m => location.CalculateDistance(
new Location(m.Latitude, m.Longitude), DistanceUnits.Miles))
.FirstOrDefault();
await Application.Current.MainPage.DisplayAlert("", first.Name + " " +
first.Location, "OK");
}
catch (Exception ex)
{
Debug.WriteLine($"Unable to query location: {ex.Message}");
await Application.Current.MainPage.DisplayAlert("Error!", ex.Message, "OK");
}
}
private async Task FindMonkeyClosestToCurrentLocation()
{
if (IsBusy || Monkeys.Count == 0)
{
return;
}
IsBusy = true;
try
{
var location = await Geolocation.GetLastKnownLocationAsync() ?? await Geolocation.GetLocationAsync(new GeolocationRequest()
{
DesiredAccuracy = GeolocationAccuracy.Medium,
Timeout = TimeSpan.FromSeconds(GpsLocationPingTimeoutInSeconds)
});
var firstClosestMonkey = Monkeys.OrderBy(monkey =>
location.CalculateDistance(new Location(monkey.Latitude, monkey.Longitude), DistanceUnits.Kilometers))
.First();
await Application.Current.MainPage.DisplayAlert("Closest Monkey", $"{firstClosestMonkey.Name} at {firstClosestMonkey.Location}", "OK");
}
catch (Exception ex)
{
Debug.WriteLine($"Unable to query location: {ex.Message}");
await Application.Current.MainPage.DisplayAlert("Error!", ex.Message, "OK");
}
finally
{
IsBusy = false;
}
}
