Bitmapfun Sample: Fix bug where background image loading could hang

Background image loading is paused when the GridView is scrolling,
if the activity is destroyed during a scroll the image loading was
not unpaused causing it to remain running indefinitely. This change
makes sure the background image loading is unpaused.

Change-Id: Iad8093fc2af50fcfc1416c5d9089db0c064711cf
2 files changed