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>(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

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

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