Location-aware resources allow your application to interact with the physical world and they are ideal for increasing user engagement. Although many mobile apps use them, the topic of this tutorial is a feature that is often overlooked, geofencing.
A geofence is a virtual perimeter set on a real geographic area. Combining a user position with a geofence perimeter, it is possible to know if the user is inside or outside the geofence or even if he is exiting or entering the area.
Geofence is an interface that represents a geographical area that should be monitored. It is created by using the Geofence. Builder. During its creation, you set the monitored region, the geofence’s expiration date, responsiveness, an identifier, and the kind of transitions that it should be looking for.
To keep power consumption to a minimum, it is recommended to use a geofence with a radius of at least 100 meters for most situations. If geofences are located in the countryside, you should increase the radius to 500 meters or higher to make sure the geofences are effective.
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