I have an activity that uses the support ViewPager. The ViewPager uses a custom adapter that contains two fragments. The fragments both load the same layout file which contain a progress bar inside of a relative layout. The progress bar is displayed when the activity starts, but it doesn't animate until the activity resumes, either from a screen rotation, app switch or any other reason. Any idea what the matter might be? My code seems kind of standard to me, which is why I'm not posting it now but if you would like a look at it to help out let me know and I'd be happy to.