A notification is a message that Android displays outside your app’s UI to provide the user with reminders, communication from other people, or other timely information from your app. Users can tap the notification to open your app or take an action directly from the notification.

How do app notifications work on Android?

The Android system looks at the message to determine which app it’s for, and starts that app. The app must have registered with Android to use GCM, and it must have the relevant permission. When the app starts, it might create a notification straight away with the data from the message.

How do mobile notifications work?

Similar to desktop push notifications, mobile app push notifications are also triggered by an existing/downloaded application on your device. … While Android has a default setting of opt-in and manual opt-out users, iOS does not allow apps to send notifications to users until they agree to receive messages.