Simple Notification in Android

Notifications are a way to provide information to your customer which displays as a pop up on the device. It helps you to keep in touch with your customer.

I am going to create a simple notification without going deep because everything is available on Google.

We must understand a few concepts before going further.

Notification channel: Assume you have developed an app for an online learning center where they teach Maths and English. Students can either learn Maths, English, or Both. we must send notification related to Maths to only students who have taken Maths. In this case, we can create channels for Maths, English, and both so triggered notification will be delivered to students who have taken that subject.

Each Notification channel can have a different Notification sound and different behavior that you can change from the Notification setting page. I forgot to tell you that Google has introduced the Notification channel from Android 8.0 i.e API level 26. Now you might be thinking that I just have to show a simple notification so you have to create a default Notification channel.

val name = "NotificationCN" // Channel Name visible to user
val descriptionText = "Sending Notification"
val channelId = "NotificationID"
val importance = NotificationManager.IMPORTANCE_HIGH // Notification Priority
val defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)val notificationBuilder = NotificationCompat.Builder(context, channelId)
.setColor(ContextCompat.getColor(context, android.R.color.holo_red_dark))
.setSmallIcon(android.R.drawable.sym_def_app_icon)
.setContentTitle(title)
.setContentText(message)
.setAutoCancel(true)
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setSound(defaultSoundUri)
val notificationManager =
context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

// Since android Oreo notification channel is needed.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
val channel = NotificationChannel(
channelId,
name,
NotificationManager.IMPORTANCE_HIGH
)
notificationManager.createNotificationChannel(channel)
}
notificationManager.notify(Random.nextInt(),notificationBuilder.buid())

I hope you will find it useful.