This simple app turns your Android phone into a Notification Channels Demo App.
To use this app the user just clicks the 'Notification Channels Demo' app icon and they are taken right into the app. They are greeted with a button labeled 'Show' when clicked with show a notification message at the top. Then various additional options are shown that come with using the Notification Channels App option.
App screen and video caps taken from App running on Nexus 5X running Android 8.0 Oreo (API Level 26).