Cache mechanism for Storage page
- Use SharedPreference to cache the size info
- Improve the flicker problem on Documents & other preference
- The jobs are destroied on onPause to prevent the jobs being
restarting when back to Storage page
- Enable progress bar animation for each storage item
Bug: 191117970
Test: manual test
1) The loading spinner will be shown when entering Storage page
at first time.
2) Back to Settings homepage and switch back to Storage page, the
loading spinner shouldn't be shown.
3) Click each preference in the Storage page and switch between these
pages, the size info should be updated if something removed and the
order of preference shouldn't be changed.
Change-Id: I75533742a025dc61116207285a894ee728d0af68
7 files changed
