Xamarin Forms: Load a contentpage when tap push notification android

Question

I completed receiving test notification from FCM console. Now I am trying to open a page when tapping the notification. Any ideas about how to achieve this? I have searched the internet but can't find a working solution. I am also able to send the notification through the postman.

Answer 1

I handle the notification tapping in following way. The page loading is handled in App.xaml.cs.

On OnCreate():

//Background or killed mode
if (Intent.Extras != null)
{
    foreach (var key in Intent.Extras.KeySet())
    {
        var value = Intent.Extras.GetString(key);
        if (key == "webContentList") 
        {
            if (value?.Length > 0)
            {
                isNotification = true;
                LoadApplication(new App(domainname, value));
            }
        }
    }
}
//Foreground mode
if (FirebaseNotificationService.webContentList.ToString() != "")
{
    isNotification = true;
    LoadApplication(new App(domainname, FirebaseNotificationService.webContentList.ToString()));
    FirebaseNotificationService.webContentList = "";
}

//Normal loading
if (!isNotification)
{
    LoadApplication(new App(domainname, string.Empty));
}

On FirebaseNotificationService:

[Service]
[IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]
public class FirebaseNotificationService : FirebaseMessagingService
{
    public static string webContentList = "";
    public override void OnMessageReceived(RemoteMessage message)
    {
        base.OnMessageReceived(message);
        webContentList = message.Data["webContentList"];

        try
        {
            SendNotificatios(message.GetNotification().Body, message.GetNotification().Title);
        }
        catch (Exception ex)
        {
            Console.WriteLine("Error:>>" + ex);
        }
    }

    public void SendNotificatios(string body, string Header)
    {
        if (Build.VERSION.SdkInt < BuildVersionCodes.O)
        {
            var intent = new Intent(this, typeof(MainActivity));
            intent.AddFlags(ActivityFlags.ClearTop);
            var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.OneShot);

            var notificationBuilder = new Android.App.Notification.Builder(this, Utils.CHANNEL_ID)
                        .SetContentTitle(Header)
                        .SetSmallIcon(Resource.Drawable.icon)
                        .SetContentText(body)
                        .SetAutoCancel(true)
                        .SetContentIntent(pendingIntent);

            var notificationManager = NotificationManager.FromContext(this);

            notificationManager.Notify(0, notificationBuilder.Build());
        }
        else
        {
            var intent = new Intent(this, typeof(MainActivity));
            intent.AddFlags(ActivityFlags.ClearTop);
            var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.OneShot);

            var notificationBuilder = new Android.App.Notification.Builder(this, Utils.CHANNEL_ID)
                        .SetContentTitle(Header)
                        .SetSmallIcon(Resource.Drawable.icon)
                        .SetContentText(body)
                        .SetAutoCancel(true)
                        .SetContentIntent(pendingIntent)
                        .SetChannelId(Utils.CHANNEL_ID);

            if (Build.VERSION.SdkInt < BuildVersionCodes.O)
            {
                return;
            }

            var channel = new NotificationChannel(Utils.CHANNEL_ID, "FCM Notifications", NotificationImportance.High)
            {
                Description = "Firebase Cloud Messages appear in this channel"
            };

            var notificationManager = (NotificationManager)GetSystemService(NotificationService);
            notificationManager.CreateNotificationChannel(channel);

            notificationManager.Notify(0, notificationBuilder.Build());
        }
    }