Marshmallow changed the way Android handles permissions in a fundamental way, but even that is not enough. The Golden State Warriors' Android app uses a phone's microphone to listen to audio in the background through a technology called beacons. The technology is from a company called Signal360 and it's done without your knowledge. Even if you're not a basketball fan, these beacons can be utilized in other apps without your knowledge. Phandroid runs down how more transparency in Android app permissions is necessary when technology like this is being used.