I get an exception when I receive a push notification on my Android tablet. Java.Lang.IllegalArgumentException has been thrown

Question

I want to receive push notifications on my Samsung tablet, but I get this exception when I want to display a notification:

Java.Lang.IllegalArgumentException has been thrown com.name.myproject: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent. Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.

I get the exception in this line:

var pendingIntent = PendingIntent.GetActivity(this, Activity1.NOTIFICATION_ID, intent, PendingIntentFlags.OneShot);

What should I change in my code?

MyFirebaseMessagingService.cs:

using System;
using Android.App;
using Android.Content;
using Android.Util;
using Firebase.Messaging;
using System.Collections.Generic;
using AndroidX.Preference;
using Android.Media;
using AndroidX.Core.App;

namespace MyAndroidProject
{
    [Service]
    [IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]
    public class MyFirebaseMessagingService : FirebaseMessagingService
    {
        const string TAG = "MyFirebaseMsgService";

        public override void OnNewToken(string token)
        {
            Log.Debug(TAG, "Refreshed token: " + token);
            storeToken(token);
        }

        private void storeToken(String token)
        {
            //saving the token on shared preferences
            ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(Application.Context);
            ISharedPreferencesEditor editor = prefs.Edit();
            editor.PutString("my_token", token);
            editor.Apply();
        }

        public override void OnMessageReceived(RemoteMessage message)
        {
            Log.Debug(TAG, "From: " + message.From);
            var body = message.GetNotification().Body;
            var title = message.GetNotification().Title;
            Log.Debug(TAG, "Notification Message Body: " + message.GetNotification().Body);
            SendNotification(body, title, message.Data);
        }

        void SendNotification(string messageBody, string Title, IDictionary<string, string> data)
        {
            var intent = new Intent(this, typeof(Activity1));
            intent.AddFlags(ActivityFlags.ClearTop);
            foreach (var key in data.Keys)
            {
                intent.PutExtra(key, data[key]);
            }

            var pendingIntent = PendingIntent.GetActivity(this,
                                                          Activity1.NOTIFICATION_ID,
                                                          intent,
                                                          PendingIntentFlags.OneShot);

            var notificationBuilder = new NotificationCompat.Builder(this, Activity1.CHANNEL_ID)
                                      .SetSmallIcon(Resource.Mipmap.Icon)
                                      .SetContentTitle(Title)
                                      .SetContentText(messageBody)
                                      .SetSound(RingtoneManager.GetDefaultUri(RingtoneType.Notification))
                                      .SetVibrate(new long[] { 1000, 1000, 0, 0, 0 })
                                      .SetLights(Android.Graphics.Color.Red, 3000, 3000)
                                      .SetPriority((int)NotificationPriority.High)
                                      .SetAutoCancel(true)
                                      .SetContentIntent(pendingIntent);

            var notificationManager = NotificationManagerCompat.From(this);
            notificationManager.Notify(Activity1.NOTIFICATION_ID, notificationBuilder.Build());
        }
    }
}

Answer 1

Hello,

Based on your description, please change the PendingIntentFlags from PendingIntentFlags.OneShot to PendingIntentFlags.Immutable like following code.

var pendingIntent = PendingIntent.GetActivity(this, Activity1.NOTIFICATION_ID, intent, PendingIntentFlags.Immutable);

Best Regards,

Leon Lu

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