🎆 Notifications 🎆 ¶

First, add the permission in AndroidManifest.xml

<uses-permission android:name="android.permission.POST_NOTIFICATIONS" />

Then, since Android O, you need to create a channel. Developers should group their notifications by channels. For the user, they can do operations like disabling a notification channel.

• Create a Channel
• I pasted the code the gave in XXX#onCreate (XXX extends Application)

See also.

• Create multi-line notifications, or add images/...
• Do something if the user clicks on the notification

You also have to provide an icon, a title, a message, and a priority.

// priority is ignored on Android O (Channel importance is used instead)
val builder = NotificationCompat.Builder(applicationContext, channel_id)
    .setSmallIcon(R.drawable.some_icon)
    .setContentTitle("title")
    .setContentText("body")
    .setPriority(NotificationCompat.PRIORITY_DEFAULT)
    
with(NotificationManagerCompat.from(context)) {
    // the "notificationId" is used to edit/close/...
    // this notification later. Use any value >0.
    notify(notificationId, builder.build())
}