Adding support for one-on-one conversation to channel preview

lib/src/channel_image.dart

@@ -57,11 +57,20 @@ class ChannelImage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final client = StreamChat.of(context);
     final channel = this.channel ?? StreamChannel.of(context).channel;
     return StreamBuilder<Map<String, dynamic>>(
         stream: channel.extraDataStream,
         initialData: channel.extraData,
         builder: (context, snapshot) {
+          var image = '';
+          if (snapshot.data?.containsKey('image') ?? false) {
+            image = snapshot.data['image'];
+          } else if (channel.state.members.length == 2) {
+            final otherMemberIndex = channel.state.members[0].user.id == client.user.id ? 1 : 0;
+            image = channel.state.members[otherMemberIndex].user.image;
+          }
+
           return ClipRRect(
             borderRadius: StreamChatTheme.of(context)
                 .channelPreviewTheme
@@ -75,9 +84,9 @@ class ChannelImage extends StatelessWidget {
               decoration: BoxDecoration(
                 color: StreamChatTheme.of(context).accentColor,
               ),
-              child: snapshot.data?.containsKey('image') ?? false
+              child: image != ''
                   ? CachedNetworkImage(
-                      imageUrl: snapshot.data['image'],
+                      imageUrl: image,
                       errorWidget: (_, __, ___) {
                         return Center(
                           child: Text(

lib/src/channel_name.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:stream_chat/stream_chat.dart';
 
+import '../stream_chat_flutter.dart';
 import 'stream_channel.dart';
 
 /// It shows the current [Channel] name using a [Text] widget.
@@ -21,15 +22,21 @@ class ChannelName extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final client = StreamChat.of(context);
     final channel = this.channel ?? StreamChannel.of(context).channel;
     return StreamBuilder<Map<String, dynamic>>(
       stream: channel.extraDataStream,
       initialData: channel.extraData,
       builder: (context, snapshot) {
-        return Text(
+        var title;
-          snapshot.data != null
+        if (snapshot.data['name'] == null && channel.state.members.length == 2) {
-              ? (snapshot.data['name'] ?? channel.cid)
+          final otherMemberIndex = channel.state.members[0].user.id == client.user.id ? 1 : 0;
-              : channel.cid,
+          title = channel.state.members[otherMemberIndex].user.name;
+        } else {
+          title = snapshot.data['name'] ?? channel.id;
+        }
+
+        return Text(title,
           style: textStyle,
         );
       },