It's no secret that our mobile devices track our locations; it's a sacrifice we make as soon as the phone is activated. However, it's always startling to know just how insecure our data can be, especially in Google Play. Anybody can place an app in the store with a small fee, meaning that anybody who downloads that app gives the company permission to know where you are. Make sure that you only download trustworthy apps to protect yourself.

Source: http://phys.org/news/2016-08-android-apps-secretly-track-users.html