use channe.state.unreacCountStream

lib/src/channel_list_view.dart

@@ -304,10 +304,8 @@ class _ChannelListViewState extends State<ChannelListView>
       return StreamChannel(
         key: ValueKey<String>('CHANNEL-${channel.id}'),
         channel: channel,
-        child: StreamBuilder<DateTime>(
-          initialData: channel.updatedAt,
-          stream: channel.updatedAtStream,
-          builder: (context, snapshot) {
+        child: Builder(
+          builder: (context) {
             Widget child;
             if (widget.channelPreviewBuilder != null) {
               child = Stack(

lib/src/channel_preview.dart

@@ -6,7 +6,6 @@ import 'package:stream_chat_flutter/src/unread_indicator.dart';
 
 import '../stream_chat_flutter.dart';
 import 'channel_name.dart';
-import 'typing_indicator.dart';
 
 /// ![screenshot](https://raw.githubusercontent.com/GetStream/stream-chat-flutter/master/screenshots/channel_preview.png)
 /// ![screenshot](https://raw.githubusercontent.com/GetStream/stream-chat-flutter/master/screenshots/channel_preview_paint.png)
@@ -103,17 +102,24 @@ class ChannelPreview extends StatelessWidget {
   }
 
   Widget _buildSubtitle(BuildContext context) {
-    final opacity = channel.state.unreadCount > 0 ? 1.0 : 0.5;
-    return TypingIndicator(
-      channel: channel,
-      alternativeWidget: _buildLastMessage(context, opacity),
-      style: StreamChatTheme.of(context).channelPreviewTheme.subtitle.copyWith(
-            color: StreamChatTheme.of(context)
-                .channelPreviewTheme
-                .subtitle
-                .color
-                .withOpacity(opacity),
-          ),
+    return StreamBuilder(
+      initialData: channel.state.unreadCount,
+      stream: channel.state.unreadCountStream,
+      builder: (context, snapshot) {
+        final opacity = (snapshot.data ?? 0) > 0 ? 1.0 : 0.5;
+        return TypingIndicator(
+          channel: channel,
+          alternativeWidget: _buildLastMessage(context, opacity),
+          style:
+              StreamChatTheme.of(context).channelPreviewTheme.subtitle.copyWith(
+                    color: StreamChatTheme.of(context)
+                        .channelPreviewTheme
+                        .subtitle
+                        .color
+                        .withOpacity(opacity),
+                  ),
+        );
+      },
     );
   }
 

lib/src/unread_indicator.dart

@@ -12,17 +12,26 @@ class UnreadIndicator extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return Padding(
-      padding: const EdgeInsets.only(left: 8.0),
-      child: CircleAvatar(
-        backgroundColor:
-            StreamChatTheme.of(context).channelPreviewTheme.unreadCounterColor,
-        radius: 6,
-        child: Text(
-          '${channel.state.unreadCount}',
-          style: TextStyle(fontSize: 8),
-        ),
-      ),
-    );
+    return StreamBuilder<int>(
+        stream: channel.state.unreadCountStream,
+        initialData: channel.state.unreadCount,
+        builder: (context, snapshot) {
+          if (!snapshot.hasData || snapshot.data == 0) {
+            return SizedBox();
+          }
+          return Padding(
+            padding: const EdgeInsets.only(left: 8.0),
+            child: CircleAvatar(
+              backgroundColor: StreamChatTheme.of(context)
+                  .channelPreviewTheme
+                  .unreadCounterColor,
+              radius: 6,
+              child: Text(
+                '${snapshot.data}',
+                style: TextStyle(fontSize: 8),
+              ),
+            ),
+          );
+        });
   }
 }