adding this to your grdale compiler "com.google.android.gms: play-services: 7.5. +" means adding all game services, including analytics, maps, vcm .. etc., you can add
as indicated in the manual:
In versions of Google Play services prior to 6.5, you had to compile the entire API package into your application. In some cases, it becomes more difficult to keep the number of methods in your application (including APIs, library methods, and native code) under the 65,536 limit.
In version 6.5, you can selectively compile the Google Play service API into your application. For example, to enable only the Google Fit and Android Wear APIs, replace the following line in your build.gradle file:
compile 'com.google.android.gms: play-services: 7.5.0' with these lines:
compile 'com.google.android.gms: play-services-fitness: 7.5.0' compile 'Com.google.android.gms: games-services wearable: 7.5.0
https://developers.google.com/android/guides/setup
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