After updating from version 2 to 3 of the plugin gradle, proguard shows now many warning. One of them is:
library class dalvik.system.DelegateLastClassLoader extends or implements program class dalvik.system.PathClassLoader
If I change the android sdk to 26 this warning dissapeard. Is this a bug of gradle or android?
I have seen many requests about gradle warnings after update to version 3, why is this happen on gradle plugin v3?
I solved using the rule:
-dontwarn dalvik.**
Not the best solution, but now I can build my app and everything seems fine.