I implemented the route recording and the live visualization on the map in MapsActivity, using a service, GPSTracker.
I also implemented the exporting of the database table in JSON format and the displaying of the recorded route in SummaryActivity.
The maps, once created are now "active": the one in MapsActivity is zoomed and centred on the user's position and the one in SummaryActivity is focalized on the route.
I provided Javadoc-style documentation for (nearly) all the classes, methods and fields.
NEEDS TESTING
Minor bug fixes
Merge pull request #5 from pcalabrese/GPSTracking2

Gps tracking2