That's a simple utility I created for my wife to track the phone GPS and generate a .GPX file to link to Lightroom photos.
If you don't like it or doesn't work for you, there's no point sending me a complaint, because I'll only change something if she asks me to.
The advantage from any other GPX logger? This utility uses the Google Play Services (Fused Location provider) to acquire your precise location fast and in a very battery efficient way and logs it to the internal memory.
For example most loggers keep your GPS running all the time, effectively draining any battery in a couple of hours. But with 5 min interval GPS tracking your GPS turns on and off every once in a while and you can easily get full day battery.
The video is for instructional use only, I just found it on YouTube by user: http://www.youtube.com/user/EgnerPhotography
the app is now open sourced: https://github.com/budius/photogpstag
feel free to fork and contribute