// gets all gyms at the given location and calculate a radius
public async Task <JsonValue> GetPlacesAsJSON(double lat, double lng, LatLngBounds llb)
{
var radius = LatLngDist.distance(llb.Northeast.Latitude, llb.Northeast.Longitude, llb.Southwest.Latitude, llb.Southwest.Longitude, 'K') * 1000 / 2;
Log.Debug("JSON", radius + "");
return(await GetPlacesAsJSON(lat, lng, radius));
}
// Activates the location listener
// distance: enforces to set a minimum distance that must be reached before the places api will be requested
public void ActivateLocationChangeRequests(Activity Activity, float distance)
{
LocHandler = new LocationHandler(Activity.GetSystemService(Activity.LocationService) as LocationManager);
LocHandler.LocationRequest += async(sender, args) =>
{
if (args == LocationHandler.messageType.LOCATION)
{
// sets the location initially
var loc = (Location)sender;
var calcDist = double.MaxValue;
if (lastPosition != null)
{
calcDist = LatLngDist.distance(loc.Latitude, loc.Longitude, lastPosition.Latitude, lastPosition.Longitude, 'K');
}
if (distance < calcDist)
{
JsonValue x = await GetPlacesAsJSON(loc.Latitude, loc.Longitude, 200);
var handler = PlacesResponse;
if (handler != null)
{
handler(x, EventArgs.Empty);
}
lastPosition = loc;
}
}
else if (args == LocationHandler.messageType.DISABLED)
{
Toast.MakeText(Activity, Resource.String.ENABLE_GPS, ToastLength.Long).Show();
}
};
// initializes the LocationHandler and fires an event if any porblems occur
LocHandler.Init();
}