Before you run your application, you need a Google Maps API key.

Once you have your key (it starts with "AIza"), replace the "google_maps_key" string in the google_maps_key.xml file.

Helpful Links:

https://www.edmonton.ca/transportation/ets/about_ets/ets-data-for-developers.aspx

https://developers.google.com/maps/documentation/android/