question

Hello,​

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After you get the content from the RemoteMessage , you need to use code to push Notification.

public override void OnMessageReceived(RemoteMessage message)
    {
        Log.Debug(Tag, "From: " + message.From);
        Log.Debug(Tag, "Notification Message Body: " + message.GetNotification().Body);

        var name = string.Empty;
        if (message.Data.Count > 0)
        {
            Log.Debug(Tag, "Message data payload: " + message.Data);
            name = message.Data["name"];
        }

        var clickAction = message.GetNotification().ClickAction;

        if (!string.IsNullOrEmpty(name))
            SendNotification(message.GetNotification().Body, name, clickAction);
        else
            SendNotification(message.GetNotification().Body);
    }


void SendNotification(string messageBody, IDictionary<string, string> data)
{
    var intent = new Intent(this, typeof(MainActivity));
    intent.AddFlags(ActivityFlags.ClearTop);
    foreach (var key in data.Keys)
    {
        intent.PutExtra(key, data[key]);
    }

    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());
}

For android 8.1 or later, before you push notification, you need to create CreateNotificationChannel as well.

void CreateNotificationChannel()
{
    if (Build.VERSION.SdkInt < BuildVersionCodes.O)
    {
        // Notification channels are new in API 26 (and not a part of the
        // support library). There is no need to create a notification
        // channel on older versions of Android.
        return;
    }

    var channel = new NotificationChannel(CHANNEL_ID,
                                          "FCM Notifications",
                                          NotificationImportance.Default)
                  {

                      Description = "Firebase Cloud Messages appear in this channel"
                  };

    var notificationManager = (NotificationManager)GetSystemService(Android.Content.Context.NotificationService);
    notificationManager.CreateNotificationChannel(channel);
}

Here is article about it.

https://docs.microsoft.com/en-us/xamarin/android/data-cloud/google-messaging/remote-notifications-with-fcm?tabs=windows

Best Regards,

Leon Lu

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