I\'ve been stuck on an issue for a while and I can\'t figure out what it is. The thing is I recently updated the Mopub Android SDK and both interstitial + banner ad
You need to create a custom native network and add your custom class in mopub site. Same with millennial and make sure you added necessary adaptors in your project.
It is ProGuard indeed. If you don't want it to "get rid" of Mopub, AdMob and MMedia code entirely, just put the following lines into proguard-project.txt file of your project:
-keep class com.google.ads.** {*;}
-keep class com.mopub.mobileads.** {*;}
-keep class com.millennialmedia.android.** {*;}
-keep class com.millennialmedia.google.** {*;}