I have an activity that plays a beep sound with MediaPlayer that works fine and used to work fine even in the proguarded production version. With the latest release it now s
I find it odd that it is telling you that is a drawable resource:
File res/raw/beep.ogg from drawable resource ID
I think you need to tell it to also keep the R class. This is what I use in an app that also loads .ogg files from raw.
-keep class *.R
-keepclasseswithmembers class **.R$* {
public static ;
}