This is a simple app that demonstrates the use of Geofences in Android. The app tracks user device location and if it entered a Geofence a notification is generated, that the user found the treasure.

A geofence is a virtual perimeter defined by GPS or RFID around a real world area. Geofences can be created with a radius around a point location. The geofencing API uses the device sensors to accurately detect the location of the device in a battery-efficient way. Geofences have three transition types.

• Enter - Indicates that the user entered the geofence(s).
• Dwell - Indicates that the user enters and dwells in geofences for a given period of time.
• Exit - Indicates that the user has exited the geofence(s).

The broadcast receiver is how Android apps can send or receive broadcast messages from the Android system and other Android apps, similar to the publish-subscribe pattern. The broadcasts are sent out and apps can register to receive specific broadcasts. When the desired broadcasts are sent out the apps are notified.

PendingIntent is an intent that will perform at a later time. A PendingIntent is a description of an Intent and target action to perform with it. Even if its owning application's process is killed, the PendingIntent itself will remain usable.

1. On Android apps targeting API 30+ are now no longer allowed to ask for background_permission at the same time as regular location permission. We have to split it into 2 separate asks:

• Ask for regular foreground location permission, once granted,
• Ask for background location permission on a new ask.