Add shift-selection to DocumentsUI.

- Move the key listener from BaseActivity into DirectoryFragment, where it
belongs.
- Add code to detect the shift key during keyboard navigation, and
extend the selection in that case.

BUG=20859059

Change-Id: Ia7d3c7d4343f0185873deeaf1a35028a716b6e19
5 files changed
tree: 493d0ad5b6611a814ff1c7c55d871f42c4cfc654
  1. res/
  2. src/
  3. tests/
  4. Android.mk
  5. AndroidManifest.xml
  6. wrap_alpha.py