https://github.com/AndreiMisiukevich/OpenTok-Xamarin.Forms/issues/34

Lib/Xamarin.Forms.OpenTok.Android/Service/PlatformOpenTokService.cs

@@ -33,7 +33,8 @@ public sealed class PlatformOpenTokService : BaseOpenTokService
         private readonly Collection<SubscriberKit> _subscribers = new Collection<SubscriberKit>();
 
         private PlatformOpenTokService()
-        {
+        {
+            _subscriberStreamIds.CollectionChanged += OnSubscriberStreamIdsCollectionChanged;
             PropertyChanged += OnPropertyChanged;
             StreamIdCollection = new ReadOnlyObservableCollection<string>(_subscriberStreamIds);
             Subscribers = new ReadOnlyCollection<SubscriberKit>(_subscribers);

Lib/Xamarin.Forms.OpenTok.iOS/Service/PlatformOpenTokService.cs

@@ -22,7 +22,8 @@ public sealed class PlatformOpenTokService : BaseOpenTokService
         private readonly Collection<OTSubscriber> _subscribers = new Collection<OTSubscriber>();
 
         private PlatformOpenTokService()
-        {
+        {
+            _subscriberStreamIds.CollectionChanged += OnSubscriberStreamIdsCollectionChanged;
             PropertyChanged += OnPropertyChanged;
             StreamIdCollection = new ReadOnlyObservableCollection<string>(_subscriberStreamIds);
             Subscribers = new ReadOnlyCollection<OTSubscriber>(_subscribers);

Lib/Xamarin.Forms.OpenTok/Service/BaseOpenTokService.cs

@@ -4,6 +4,7 @@
 using System;
 using System.Threading.Tasks;
 using System.Collections.ObjectModel;
+using System.Collections.Specialized;
 
 namespace Xamarin.Forms.OpenTok.Service
 {
@@ -12,12 +13,14 @@ public abstract class BaseOpenTokService : IOpenTokService
     {
         public event PropertyChangedEventHandler PropertyChanged;
 
-        public abstract ReadOnlyObservableCollection<string> StreamIdCollection { get; }
-
         public event Action<string> Error;
 
         public event Action<string> MessageReceived;
 
+        public event NotifyCollectionChangedEventHandler StreamIdCollectionChanged;
+
+        public abstract ReadOnlyObservableCollection<string> StreamIdCollection { get; }
+
         private readonly object _propertiesLocker = new object();
 
         private readonly Dictionary<string, object> _properties = new Dictionary<string, object>();
@@ -91,6 +94,9 @@ public bool IsPublishingStarted
         protected void RaiseMessageReceived(string message) 
             => MessageReceived?.Invoke(message);
 
+        protected void OnSubscriberStreamIdsCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
+            => StreamIdCollectionChanged(sender, e);
+
         private T GetValue<T>(T defaultValue, [CallerMemberName] string name = null)
         {
             lock (_propertiesLocker)

Lib/Xamarin.Forms.OpenTok/Service/IOpenTokService.cs

@@ -2,17 +2,20 @@
 using System.Collections.ObjectModel;
 using System.ComponentModel;
 using System.Threading.Tasks;
+using System.Collections.Specialized;
 
 namespace Xamarin.Forms.OpenTok.Service
 {
     public interface IOpenTokService : INotifyPropertyChanged
     {
-        ReadOnlyObservableCollection<string> StreamIdCollection { get; }
-
         event Action<string> Error;
 
         event Action<string> MessageReceived;
 
+        event NotifyCollectionChangedEventHandler StreamIdCollectionChanged;
+
+        ReadOnlyObservableCollection<string> StreamIdCollection { get; }
+
         bool IsVideoPublishingEnabled { get; set; }
 
         bool IsAudioPublishingEnabled { get; set; }

OpenTok.nuspec

@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
   <metadata>
     <id>Xamarin.Forms.OpenTok</id>
-    <version>1.2.5</version>
+    <version>1.2.6</version>
     <title>Xamarin.Forms.OpenTok</title>
     <authors>Andrei Misiukevich</authors>
     <owners>Andrei Misiukevich</owners>