With Android Oreo, i.e. Android 8.0, Google introduced Notification Channels . You can get to know more about the UX in the Notifications UX talk at Google I/O 2017 . For applications targeting API 26, i.e. Android 8.0, Google is enforcing every app to have a notification channel for their notifications. Without a notification channel, the applications notifications do not show up. For applications targeting < SDK 26, all notifications fall in the default notification channel, but the apps get to control the notification sound and vibration per notification. Notification Channels Notification channels provide a unified system to help users manage notifications. Notification channels allow you to create a user-customizable channel for each type of notification you want to display. Users can manage most of the settings associated with notifications using a consistent system UI. All notifications posted to the same notification channel have the same behavior. Users can visit Se