The new UI intentionally does not look like the app drawer from
launcher so user is clear this is a preview screen.
Change-Id: Iba87fab72e77921c1f1014fca24476bd4af2d19c
Fixes: 70043399
Test: visual
- Replace ListView with RecyclerView in layout
- Replace ApplicationAdapter's superclass to be RecyclerView.Adapter
- Change adapter interfaces (where necessary) to work with RecyclerView
- Replace fast scroll with Recycler's mechanism (all in xml)
- Removed section indexer (text bubble when fast scroll) because
recyclerview doesn't support it.
Bug: 64804294
Test: robotests
Change-Id: I55b221836ce6abdeddf4568c8a8a5632cbddbd3b
