proguard.flags - platform/packages/services/Telephony - Git at Google

 # Keep names that are used only by animation framework.
 -keepclasseswithmembers class com.android.phone.AnimationUtils$CrossFadeDrawable {
   *** setCrossFadeAlpha(...);
 }

 -verbose
	# Keep names that are used only by animation framework.
	-keepclasseswithmembers class com.android.phone.AnimationUtils$CrossFadeDrawable {
	*** setCrossFadeAlpha(...);
	}

	-verbose