FCM foreground notification Java.Lang.IllegalArgumentException error - firebase

Question

I am able to receive the message but only display in the log. I wanted to display as a notification at the top of the screen.
Here is my code:
MainActivity.cs
static readonly string TAG = "MainActivity";
internal static readonly string CHANNEL_ID = "my_notification_channel";
internal static readonly int NOTIFICATION_ID = 100;
protected override void OnCreate(Bundle bundle)
{
TabLayoutResource = Resource.Layout.Tabbar;
ToolbarResource = Resource.Layout.Toolbar;
base.OnCreate(bundle);
UserDialogs.Init(this);
CreateNotificationChannel();
CrossMedia.Current.Initialize();
Plugin.CurrentActivity.CrossCurrentActivity.Current.Activity = this;
global::Xamarin.Forms.Forms.Init(this, bundle);
LoadApplication(new App(FirebaseInstanceId.Instance.Token));
}
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);
}
}
In MyFirebaseMessagingService class
[Service]
[IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]
public class MyFirebaseMessagingService : FirebaseMessagingService
{
const string TAG = "MyFirebaseMsgService";
public override void OnMessageReceived(RemoteMessage message)
{
Log.Debug(TAG, "From: " + message.From);
var body = message.GetNotification().Body;
Log.Debug(TAG, "Notification Message Body: " + body);
SendNotification(body, message.Data);
}
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());
}
}
I can received the message in here: Log.Debug(TAG, "Notification Message Body: " + body); and it will log the body of the message however after calling the SendNotification function, then in this line:
var notificationManager = NotificationManagerCompat.From(this);
notificationManager.Notify(MainActivity.NOTIFICATION_ID, notificationBuilder.Build());
It will have error: Java.Lang.IllegalArgumentException: <Timeout exceeded getting exception details>
Where can I am getting the value for CHANNEL_ID and NOTIFICATION_ID? Currently, it has value: my_notification_channel and 100 respectively as same as in the docs. Is this the reason why I'm having this error?
Please help. Thank you.

Answer 1

You had a problem with the Notification construction
var notificationBuilder = new NotificationCompat.Builder(this, MainActivity.CHANNEL_ID)
.SetSmallIcon(Resource.Drawable.ic_stat_ic_notification) //you could not commen it
.SetContentTitle("FCM Message")
.SetContentText(messageBody)
.SetAutoCancel(true)
.SetContentIntent(pendingIntent);
SetSmallIcon is a required parameter, otherwise you will build an error