setBubbleMetadata
open fun setBubbleMetadata(@Nullable data: NotificationCompat.BubbleMetadata): NotificationCompat.Builder(source)
Sets the BubbleMetadata that will be used to display app content in a floating window over the existing foreground activity.
This data will be ignored unless the notification is posted to a channel that allows bubbles.
Notifications allowed to bubble that have valid bubble metadata will display in collapsed state outside of the notification shade on unlocked devices. When a user interacts with the collapsed state, the bubble intent will be invoked and displayed.