I'm currently looking into a possible custom solution for the AttributeSet. Having made a wrapper for it, I got an error with the java.lang.ClassCastException: AttributeSetWrapper cannot be cast to android.content.res.XmlBlock$Parser. Having searched a little on the Internet, I realized that somewhere in the android sources there is a cast to the private and final implementation of AttributeSet (kinda optimization). How realistic is it somehow to add your attributes without xml in runtime? Taking into account the fact that Android Studio somehow renders all this. I understand that this is not quite right from the point of view of Android, but I want to explore the possibilities of bypassing (somehow through reflection or other ways).