custom ViewGroup example?

I think the simplest example to look at is the source for AbsoluteLayout.java

https://github.com/android/platform_frameworks_base/blob/master/core/java/android/widget/AbsoluteLayout.java

You need to override onMeasure to measure the children and onLayout to position them.

I have strikingly more complicated ViewGroup code I can share as well if you want.