Adapter library import

[mario]

I would like to ask if I can import the following library:

https://github.com/davideas/FlexibleAdapter

It would be good so we can use sticky headers, load more, animations and such without reinventing the wheel.

Thanks!

cc @AndyScherzinger @tobiasKaminsky

[AndyScherzinger]

Following up on the discussion on IRC, I vote yes for several reasons:

• the idea is to start integrating it with 2.1 and until then the 5.0 release (of the lib) should be released stable
• it can then replace the SectionedRecyclerViewAdapter lib we use for the auto upload view
• we can make use of load more (for activities), sticky list headers (upload view, sorting orders, etc.)
  *`according to the lib description also safe on some boilerplate code (haven't looked at that in detail yet).

[tobiasKaminsky]

Fine for me 👍
But should be done step by step and not in one big huge PR as this is too hard to review.
So, eg. one PR for auto upload view, one for sticky list header on upload view, and so on.

Best would be to brainstorm what we want to change as a meta issue and then to this step by step like in #285

[joshtrichards]

This library is now de facto defunct: davideas/FlexibleAdapter#773 (comment)

[tobiasKaminsky]

Thus closing.