How to reduce apk size when using play services gcm

Question

My generated signed apk size is 30kB, when I add play services gcm to gradle file the apk size increased to 800kB. by shrinking resource the apk size become 600

Answer 1

from http://proguard.sourceforge.net/manual/examples.html#application

-optimizationpasses 3

-overloadaggressively

-repackageclasses ''

-allowaccessmodification

these might help. (in particular the 3 passses)