FCM - Only 'display' push notification when app is in background - firebase

Question

Currently, I have push notifications being sent and received in my Xamarin app. When I send a push notification the sneak peak dialogue is displayed when the app is in the foreground & also the background. I am trying to only visual display a push notification when the app is in the background. When the user is in the foreground the notification just sneaks into the HUD and is not displayed.
Here is my code:
Xamarin Android
[Service]
[IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]
public class FCMMessagingService : FirebaseMessagingService
{
const string TAG = "MyFirebaseMsgService";
public override void OnMessageReceived(RemoteMessage message)
{
try
{
var _message = message.GetNotification().Body;
var _title = message.GetNotification().Title;
MainActivity.SendNotification(_title, _message);
}
catch (Exception e)
{
//Was NotificationType null? this should never be null anyways
}
}
}
API - Android Payload
return new JObject(
new JObject(
new JProperty("notification",
new JObject(
new JProperty("body", message),
new JProperty("title", title),
new JProperty("icon","toasticon"),
new JProperty("user", fromId != null ? fromId.ToString() : "")
)
),
new JProperty("data",
new JObject(
new JProperty("notificationtype", notificationType)
)
)
)
).ToString();

Answer 1

If you have followed the firebase setup for xamarin android
You might have read there that foreground notifications have to be displayed manually,
How to do that?
This is how
In the setup, you will have a class inheriting from FirebaseMessagingService
In that class, there will be a piece of code something like this():
var pendingIntent = PendingIntent.GetActivity(this,
MainActivity.NOTIFICATION_ID,
intent,
PendingIntentFlags.OneShot);
var notificationBuilder = new NotificationCompat.Builder(this, MainActivity.CHANNEL_ID)
.SetSmallIcon(Resource.Drawable.ic_stat_ic_notification)
.SetContentTitle("FCM Message")
.SetContentText(messageBody)
.SetAutoCancel(true)
.SetContentIntent(pendingIntent);
var notificationManager = NotificationManagerCompat.From(this);
notificationManager.Notify(MainActivity.NOTIFICATION_ID,
notificationBuilder.Build());
This piece of code sends the notification to the Android tray, When in the foreground and hence if you comment this you will get the desired output.
Good luck!
In case of queries revert.