Xamarin Forms: How to implement notification tapping in android platform?

Question

I have implemented the push notification using FCM in my xamarin forms android project. When I tap on the notification I will show the corresponding content page also.

My code for showing the notification on UI using notificationBuilder

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

    if (Build.VERSION.SdkInt < BuildVersionCodes.O)
    {
        var notificationBuilder = new NotificationCompat.Builder(this)
                    .SetContentTitle(Header)
                    .SetSmallIcon(Resource.Drawable.icon)
                    .SetContentText(body)
                    .SetAutoCancel(true)
                    .SetContentIntent(pendingIntent);

        var notificationManager = GetSystemService(Context.NotificationService) as NotificationManager;

        notificationManager.Notify(0, notificationBuilder.Build());
        //notificationManager.Notify(new Random().Next(), notificationBuilder.Build());
    }
    else
    {
        var notificationBuilder = new NotificationCompat.Builder(this, Utils.CHANNEL_ID)
                    .SetContentTitle(Header)
                    .SetSmallIcon(Resource.Drawable.icon)
                    .SetContentText(body)
                    .SetAutoCancel(true)
                    .SetContentIntent(pendingIntent);


        var notificationManager = GetSystemService(Context.NotificationService) as NotificationManager;

        NotificationChannel channel = new NotificationChannel(Utils.CHANNEL_ID, "FCM Notifications", NotificationImportance.Default);
        notificationManager.CreateNotificationChannel(channel);

        notificationManager.Notify(0, notificationBuilder.Build());
        //notificationManager.Notify(new Random().Next(), notificationBuilder.Build());
    }
}

I have implemented the notification tapping like below:

MainActivity:

//Background or killed mode
if (Intent.Extras != null)
{
    foreach (var key in Intent.Extras.KeySet())
    {
        var value = Intent.Extras.GetString(key);
        Log.Debug(TAG, "Key: {0} Value: {1}", key, value);
        if (key == "webContentList") // Make it Dynamic instead of hardcoding here 
        {
            if (value?.Length > 0)
            {
                isNotification = true;
                LoadApplication(new App(value));
            }
        }
    }
}
//Foreground mode
if (FirebaseNotificationService.webContentList.ToString() != "")
{
    isNotification = true;
    LoadApplication(new App(FirebaseNotificationService.webContentList.ToString()));
    FirebaseNotificationService.webContentList = "";
}

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

On App.xaml.cs:

public App(string domain, string isNotification)
{
    //Notification tapping section
    if ((!String.IsNullOrEmpty(isNotification) && isNotification?.Length > 0) || _webContentList != null)
    {
        _webContentList = JsonConvert.DeserializeObject<List<webContentList>>(isNotification);
        MainPage = new DashBoardPage(_webContentList[0],null, isGroup);//loading the corresponsing page
    }
    else if (domain == "")//normal loading
    {
        MainPage = new SmartWCM.MainPage(domain, false);
    }
}

Currently, only one notification will show on the phone. The new notifications will clear the old one and the last notification will show on the UI. This is happening because I have set 0 as the value inside notificationManager.Notify.

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

If I change it like a random number like below all notification will show on UI.

notificationManager.Notify(new Random().Next(), notificationBuilder.Build());

My problem at this stage(when multiple notifications are visible on UI) how I can implement the notifications tapping? If I click any notification only the last notifications corresponding page will open. Any solution for this.

Answer 1

Hello,​

When you create the pendingIntent, you set requestCode to 0, please change the requestCode from 0 to new Random().Next() like following code

   var pendingIntent = PendingIntent.GetActivity(context, new Random().Next(), intent, PendingIntentFlags.OneShot);  

I check the android source code of the PendingIntent, IIententSender use requestCode to distinguish different PendingIntents

Best Regards,

Leon Lu

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