Implement bucketed sorting in DocumentsUI.

Change the sort code in the Model to bucket items into two separate
categories (folders and documents) and then sort the two buckets
separately.

Add code to the adapter to insert a visual break in the UI, between
folders and documents.

Change-Id: I759fedcef829aba9ad61554326489a9e62641cc7
6 files changed
tree: ad7415eb2a50beffa282a63ed3d2f4bb11e2685e
  1. res/
  2. src/
  3. tests/
  4. Android.mk
  5. AndroidManifest.xml
  6. wrap_alpha.py