Sets the live region mode for the specified view. This indicates to
accessibility services whether they should automatically notify the user
about changes to the view's content description or text, or to the
content descriptions or text of the view's children (where applicable).
For example, in a login screen with a TextView that displays an "incorrect
password" notification, that view should be marked as a live region with
mode
#ACCESSIBILITY_LIVE_REGION_POLITE.
To disable change notifications for this view, use
#ACCESSIBILITY_LIVE_REGION_NONE. This is the default live region
mode for most views.
To indicate that the user should be notified of changes, use
#ACCESSIBILITY_LIVE_REGION_POLITE.
If the view's changes should interrupt ongoing speech and notify the user
immediately, use
#ACCESSIBILITY_LIVE_REGION_ASSERTIVE.