In this tutorial, you learned about Notification Channels for Android O: what they are and how to create one, as well as how to post a notification to a channel, how to access a channel's notification settings, how to group notification channels, and

In part 1 we will start by creating notification channels (Categories) which are necessary since Android Oreo (API level 26) to be able to show any notifications. These channels should be created as soon as we start our app, so we will do it in the onCrea

In this tutorial, you have learned how to create notifications, notification channels, notification groups, and customize their display and behavior. You have learned how to add actions to notifications and work with the AlarmManager to schedule notificat