Real time GPS UWP - background

Question

I really want to know how do I can update the position of the user in the map while the UWP app was running in bakground
Here is my code right now
private async void PinPoints()
{
//Pin point to the map
Windows.Devices.Geolocation.Geopoint position = await Library.Position();
double lat = position.Position.Latitude;
double lon = position.Position.Longitude;
//Geoposition alttest = await Library.Temp();
//alt = alttest.Coordinate.Altitude;
DependencyObject marker = Library.Marker(""
//+ Environment.NewLine + "Altitude " + alt
);
Display.Children.Add(marker);
Windows.UI.Xaml.Controls.Maps.MapControl.SetLocation(marker, position);
Windows.UI.Xaml.Controls.Maps.MapControl.SetNormalizedAnchorPoint(marker, new Point(0.5, 0.5));
Display.LandmarksVisible = true;
Display.ZoomLevel = 16;
Display.Center = position;
}
This function will pinpoint the current location for me but it will do only when user open this page due to I've put it in the public Map() {}
Current : Get the location when open map page and when I walk the map still be the same place
What I want : The position keep changing while I move on and also run on background (If application is close location data still changed)
Is there any code to solve this location problem if I have to add code where should I fix and what should I do?
Additional now I perform the background (Not sure is it work or not) by create the Window Runtime Component (Universal) with class like this
*I already put this project as the reference of the main one
namespace BackgroundRunning
{
public sealed class TaskBG : IBackgroundTask
{
BackgroundTaskDeferral _deferral = null;
Accelerometer _accelerometer = null;
Geolocator _locator = new Geolocator();
public void Run(IBackgroundTaskInstance taskInstance)
{
_deferral = taskInstance.GetDeferral();
try
{
// force gps quality readings
_locator.DesiredAccuracy = PositionAccuracy.High;
taskInstance.Canceled += taskInstance_Canceled;
_accelerometer = Windows.Devices.Sensors.Accelerometer.GetDefault();
_accelerometer.ReportInterval = _accelerometer.MinimumReportInterval > 5000 ? _accelerometer.MinimumReportInterval : 5000;
_accelerometer.ReadingChanged += accelerometer_ReadingChanged;
}
catch (Exception ex)
{
// Add your chosen analytics here
System.Diagnostics.Debug.WriteLine(ex);
}
}
void taskInstance_Canceled(IBackgroundTaskInstance sender, BackgroundTaskCancellationReason reason)
{
_deferral.Complete();
}
async void accelerometer_ReadingChanged(Windows.Devices.Sensors.Accelerometer sender, Windows.Devices.Sensors.AccelerometerReadingChangedEventArgs args)
{
try
{
if (_locator.LocationStatus != PositionStatus.Disabled)
{
try
{
Geoposition pos = await _locator.GetGeopositionAsync();
}
catch (Exception ex)
{
if (ex.HResult != unchecked((int)0x800705b4))
{
System.Diagnostics.Debug.WriteLine(ex);
}
}
}
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex);
}
}
public void Dispose()
{
if (_accelerometer != null)
{
_accelerometer.ReadingChanged -= accelerometer_ReadingChanged;
_accelerometer.ReportInterval = 0;
}
}
}
}

Answer 1

Your Solution :
Make 3 projects in your solution.
1> Background Task "references App_Code"
2> App_Code "contains calculations,mostly Backend Code"
3> Map(Main Project) "references App_Code"
Register a background Task to your project and specify the time interval after which it should run again
Scenario 1> App Open,User Requests Update
Trigger Your background Task from code behind.
Scenario 2> App Closed,Not Being Used
Run your background task!
So basically keep your backgroundTask simple(make it a class in whose run method you just call the proper App_Code Classes Method) and all calculations that you want to happen in the background keep them in App_Code. Also, if I am no wrong the minimum interval between which a background Task is triggered by itself cannot be set below 15 minutes.
For real-time you could look at SignalR ( can't help any further here)