Jack looked like a strange idea to me, because all tooling like annotation processing, compiler enhancements (Lombok?), and many others will not work. Javac is great, but it is 20 years old! It would be impossible to create such mature compiler shortly. Support (and Design, Recycler etc) are very good, but their bugs are incredible sometimes. In support 23.2, IIRC, they suddenly included vector drawables which led to instant crash on Android older than Lollipop. Support-v7 version 24 or 25 suddenly became support-v9 (without explicit renaming), dropping API 7 and 8 support. In support-v13, there is FragmentStatePagerAdapter, which really can be used since API 17, where native child-fragments are supported. So, in my opinion, Google generates many questions and dead kittens.

I think I remember using

FragmentStatePagerAdapter

on API < 17.

@mg6maciej there are two of them. You can use one from AppCompat v4 with backported fragments. And you can use another one from v13 with native fragments, but on API<17 it’s impossible to do inside of another fragment, when you need child fragment manager which came in API 17.

Ohh, makes sense. Never used v13.