setGroupAlertBehavior

Sets the group alert behavior for this notification. Use this method to mute this notification if alerts for this notification's group should be handled by a different notification. This is only applicable for notifications that belong to a group. This must be called on all notifications you want to mute. For example, if you want only the summary of your group to make noise, all children in the group should have the group alert behavior GROUP_ALERT_SUMMARY.

The default value is GROUP_ALERT_ALL.