HowTo: Use Location Tracking

This documentation is valid for:
GeneXus 18 Help
GeneXus 17 Help

This document explains how to use Location Tracking using methods provided by the Maps external object.

In order to create an application that keeps track of a device's position, it is possible to define a Panel object with three events (buttons):

The first button starts the tracking:

Event 'StartTracking'
    Composite
        Maps.ClearLocationHistory()
        Maps.StartTracking(60,100,"",0)
        msg("Start")
    EndComposite
EndEvent

Read about the StartTracking method.

The second button stops the tracking:

Event 'StopTracking'
    Composite
        Maps.EndTracking()
        msg("Stop")
    EndComposite
EndEvent

Read about the EndTracking method.

At the end, the GeoPoints can be recovered using the GetLocationHistory method:

Event 'SetPositionsInMap'
    &locationCollection = Maps.GetLocationHistory(&Today)
Endevent

and the loaded collection would be shown in a Grid with its Control Type property = Maps.

To download an example, click here: GeoLocationAPI Tracking.

Note that the tracking system can be expensive in terms of battery, so the tracking operations should be started and ended based on the specific needs of the application.

Note: In Apple, if you want to do background tracking, it is necessary to include the 'location' value to the Background Modes property.

HowTo: Use Location Tracking

See Also