Only show voicemail tab if there is at least one active provider.

- In CallLogActivity's onResume, check the voicemail status and
update the tabs if the number of active voicemail providers has
changed.
- In ViewPagerTabs, remove all the child's views when setting the
view pager.
- Note: Tab will show if Google Voice is installed, even if it is not
enabled to view/play voicemails in the phone call log.

Bug: 10696509
Change-Id: Id4d68a0f7b04465534c711e10cff15d4a209ab78
2 files changed
tree: 8768cea7d12e8f79ee0a886083c5baef576fc7af
  1. res/
  2. src/
  3. tests/
  4. Android.mk
  5. AndroidManifest.xml
  6. proguard.flags