title: disable Progressbar accessibility event trigger
body: <p>In Android when Talkback is enabled and you use a progressbar in a view. then each time the progressbar is updated, then also an accessibility event is triggered to inform the user that there has been some progress update. However this causes that talkback is constantly notifying the user of updates because the progress is constantly updating. Is there some way to disable or suppress the chain of events that cause Talback to speak when a progressbar updates?</p>