Android notification icon is blank on some devices

I tested on android 9,10,11. It's working fine. In android studio, select image asset -> click icon type -> click Notification icons like this notification icon creation in android studio or create vector asset.both worked.

    class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_scrolling)
              sendNotification("Hello","thinking of refering friend?",intent);
        }


    private fun sendNotification(title: String?, message: String?, intent: Intent) {
        val pendingIntent = PendingIntent.getActivity(
                this,
                0 /* Request code */,
                intent,
                PendingIntent.FLAG_ONE_SHOT
        )

        // With the default notification channel id the heads up notification wasn't displayed
        val channelId = getString(R.string.heads_up_notification_channel_id)
        val notificationBuilder =
                NotificationCompat.Builder(this, channelId).setSmallIcon(R.drawable.abcd)
                        .setAutoCancel(true)
                        .setColorized(true)
                        .setColor(ContextCompat.getColor(this, R.color.color_orange))
                        .setDefaults(Notification.DEFAULT_ALL)
                        .setPriority(Notification.PRIORITY_MAX)
                        .setContentIntent(pendingIntent)


        if (title != null) {
            notificationBuilder.setContentTitle(title)

        }

        if (message != null) {
            notificationBuilder.setContentText(message).setStyle(
                    NotificationCompat.BigTextStyle()
                            .bigText(message)
            )
        }

        val notificationManager = 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,
                    "Test",
                    NotificationManager.IMPORTANCE_HIGH
            )
            notificationManager.createNotificationChannel(channel)
        }

        notificationManager.notify(Random.nextInt()/* ID of notification */, notificationBuilder.build())
    }
}

let me know .

I have had a similar Issue before. In my case the problem was the icon that I tried to use. I used a non-PNG file for the icon of the notification. When I switch it to PNG format, the nofication worked normally for all devices I tested.

If you are not using Png format for the icon , you can try this way.

Also, the problem can be the size of your icon in android reference website it is stated that

Set the small icon to use in the notification layouts. Different classes of devices may return different sizes.

Also see this guiadeline for Keyline Shapes