GetGeopositionAsync does not return

Question

In my Windows Phone 8 app, I am trying to use GetGeopositionAsync on the main page to display some items based on user location.

Calling GetGeopositionAsync does not

Answer 1

See my sample: http://code.msdn.microsoft.com/windowsapps/How-to-use-Cimbalino-3888977e

it uses MVVM & Cimbalino Toolkit!

In my case I set ReportInterval = 5 to solve that problem.

Answer 2

I know this is a bit older, but I hope that others searching for this topic find this answer helpful.

Make sure to get the user's consent before attempting to access the location services.

I was running into this problem but fixed it by calling the OnNavigatedTo event when opening the page to get their consent.

protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
    if (IsolatedStorageSettings.ApplicationSettings.Contains("LocationConsent"))
    {
        // User has opted in or out of Location
        return;
    }
    else
    {
        MessageBoxResult result = 
            MessageBox.Show("This app accesses your phone's location. Is that ok?", 
            "Location",
            MessageBoxButton.OKCancel);

        if (result == MessageBoxResult.OK)
        {
            IsolatedStorageSettings.ApplicationSettings["LocationConsent"] = true;
        }else
        {
            IsolatedStorageSettings.ApplicationSettings["LocationConsent"] = false;
        }

        IsolatedStorageSettings.ApplicationSettings.Save();
    }
}

Answer 3

This is strange but GetGeoPositionAsync only returns the current position when the Geolocator is initialized with either MovementThreshold and/or ReportInterval.

Geolocator geolocator = new Geolocator();
geolocator.DesiredAccuracyInMeters = 50;
geolocator.MovementThreshold = 5;
geolocator.ReportInterval = 500;

Geoposition geoposition = null;
try
{
    geoposition = await geolocator.GetGeopositionAsync(
        maximumAge: TimeSpan.FromMinutes(5),
        timeout: TimeSpan.FromSeconds(10));
}
catch (UnauthorizedAccessException ex)
{
    // location services disabled or other error
    // user should setup his location
}

Answer 4

I found that if you created the Geolocator locally, the task will end up being cancelled. It works when I created a permanent Geolocator instance.

Answer 5

Well it looks like everyone hacked away until it worked... Here's what worked for me:

/// <summary>
/// HACK: For some reason Geolocator.GetGeopositionAsync hangs indefinitely.
/// The workaround is to add a PositionChanged handler.
/// </summary>
private Geoposition GetGeoposition()
{
    var geolocator = new Geolocator();
    var semaphoreHeldUntilPositionReady = new SemaphoreSlim(initialCount: 0);
    Geoposition position = null;

    geolocator.ReportInterval = 1000;
    geolocator.PositionChanged += (sender, args) =>
    {
        position = args.Position;
        semaphoreHeldUntilPositionReady.Release();
    };

    semaphoreHeldUntilPositionReady.Wait();
    return position;
}

Answer 6

I found one thing. If I set accuracy to bigger one then geolocator starts return coordinates. So it dosen't work for 50 meters but works for 500 so try to use the line below instead.

        geolocator.DesiredAccuracyInMeters = 500;