It looks like the GPS addon for android is not working due to permission issues. The error when running the app on a device:
SecurityException: “network” location provider requires ACCESS_COARSE_LOCATION or ACCESS_FINE_LOCATION permission.
What I understand is that these 2 permissions are since Android 6 (api level 23) treated as ‘dangerous’ and the user must explicitly grant your app access (so doing it in the manifest is not enough). See:
Does anyone know what to do in order to have the ofxGPS addon to work on android?