Wow, thanks for all the responses!
OliverA, that is basically what I want to do.
It only shows the content you see on the Device. Kind of a Mirror display. But not a different display (video or whatever).
You don't even need a library for that, just a MHL or ScreenPort(or whatever it is called) cable.
There is a library that is supposed to do this. It wraps the presentation class which was introduced in lolipop. 3 issues for me.: 1) old library doesn't build. There is more information on the question thread I posted before this. 2) I can't wrap a present, let alone a complex library. 3) Time. I haven't got enough to figure it out. I just want a simple implementation where I give an object a panel with one or more views in it, and boom, magic. Two screens.
Plus the client will pay happily if the implementation is quick. And it would be a cool library for the community. So that is a bonus.
somed3v3loper is working on it at the moment. So holding thumbs.