You could probably build a simple animation SWF in Flash Professional.
Or Flex has a progress bar component:
<mx:ProgressBar indeterminate="true" labelPlacement="center" label="" />
Or there is also a busy cursor animation that you could use:
Well, in Hero on the devices (ie: Android), you don't have a cursor.
Also, there doesn't exist a ProgressBar object being available on mobile Hero.
I'm using Flash Builder Premium (pre-release) 4.5. I'm building mobile applications and noticed there was no ProgressBar components as well. Adobe - you need to get the ProgressBar component in Flex for Mobile. (it's pretty important, no?)
It looks like there is still no native ProgressBar support available in the new 4.5.1 release for Flex Mobile projects, unless I've completely missed something...
Come on Flex team, really? We can't have a ProgressBar on a mobile device?
You can use this:
Not the best solution, but works
I am using this in my action bar as if If use it on the view that is busy, the space is not available for that view even after removing the busy indicator