title: How to add Google Play APK Expansion Library to android studio project?
body: <p>I have so apps that use APK Expansion Files.  I usually have build these apps with <code>ant</code>.  But I want to add AdMob code to these apps and apparently there is no way to build an AdMob app from the command-line so I have to use Android Studio.  I looked at these docs: <a href="http://developer.android.com/google/play/expansion-files.html" rel="nofollow">http://developer.android.com/google/play/expansion-files.html</a> and they do not tell me what magic incantation I need to use in my gradle file.  Does anyone know? </p>