Android : What is the correct way of stopping AsyncTask from the UI-thread

my AsyncTask should wait till event in the UI-thread happen.

so, I started to have simple while loop. However, in some of the devices that caused the UI thread to freeze. so after reading the following answer: Fatal Spin-On-Suspend/Stuck on ThreadID [However, it is not quite the same - i put the while in the async-task not in main-activity]

I added Thread.sleep - and it seem to indeed solve the problem.

However, I feel like I'm doing something wrong here...I wonder what is the right way to do it.