On Android, semantic announcements are deprecated as of API 36. Currently we are sending announcements in the following widgets.

• material/CalendarDatePicker
• material/ExpansionTile Replace semantic announcements in expansion tile for Android #179917 (see linked sub issue below)
• material/TimePicker Remove use of announce in time_picker and remove double Feedback.forTap calls #167241
• widgets/Form Add back "Use live region in error text input decorator for Android #165531" #168992

We should still keep the same functionality for announcing these semantic events for all other platforms.