FCM notification message are not received in android Oreo version?

Question

I have send FCM notification from server to users. It works fine(until api 25) but in Oreo when the application have not in background(services are closed) (or) completely close

Answer 1

In oreo version can not add a notification without Channel so need to add following code in firebase notification Service class for oreo notification without channel can not send notification :

private void sendMyNotification(String message,String title) {
    NotificationManager notificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    Intent intent = new Intent(this, MainActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
    Uri soundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
        @SuppressLint("WrongConstant")
        NotificationChannel notificationChannel=new NotificationChannel("my_notification","n_channel",NotificationManager.IMPORTANCE_MAX);
        notificationChannel.setDescription("description");
        notificationChannel.setName("Channel Name");
        notificationManager.createNotificationChannel(notificationChannel);
    }
        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.drawable.listlogo)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.tlogo))
                .setContentTitle(title)
                .setContentText(message)
                .setAutoCancel(true)
                .setSound(soundUri)
                .setContentIntent(pendingIntent)
                .setDefaults(Notification.DEFAULT_ALL)
                .setPriority(NotificationManager.IMPORTANCE_MAX)
                .setOnlyAlertOnce(true)
                .setChannelId("my_notification")
                .setColor(Color.parseColor("#3F5996"));
        //.setProgress(100,50,false);
        notificationManager.notify(0, notificationBuilder.build());
}