GPS Log (com.mayong.gpslog) on Google Play
This app will help you do two things:1, Tell you who is using GPS now. It will post a notification if some app is using GPS forground or background. And if you find some app is using GPS abnormaly, you can force stop the app.2, Record GPS usage Log. It will record the number of times, total time, last time that each app using GPS.Attention: 1, This app requires root permission to detect who is using GPS.2, If you are using android 3.0 or higher, you should launch the app at least once. So this app will recieive gps change broadcast.