Using Robotium to test progress of a progress bar in Android (Java)

I want to assert/verify that the progress bar updates when a user completes a certain action. Right now a progress bar is shown at the top of an activity, and when the user completes a certain action the progress bar updates. I want to write a test for this, but documentation so far looks pretty thin. Anything recommended? Is there a different testing library that achieves what I want to test?