Title: Theory / Unimportant / CS / Programming / Java / Android / Notification

Name: notification
Definition: first as a small icon in the status bar
Page: https://developer.android.com/training/notify-user/build-notification
https://developer.android.com/guide/topics/ui/notifiers/notifications
Definition2: then as a message in the notification drawer
DefType: Short, timely information about events in your app while it's not in use

Name: Heads-up notification
Definition: An urgent notification shown on foreground on current app
Page: https://developer.android.com/guide/topics/ui/notifiers/notifications