fcm

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
int importance = NotificationManager.IMPORTANCE_HIGH;
NotificationChannel mChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, title, importance);
mChannel.setDescription(notification);
mChannel.enableLights(true);
mChannel.setLightColor(ContextCompat.getColor(getApplicationContext(),R.color
.colorPrimary));
notificationManager.createNotificationChannel(mChannel);
}