The Conversation List + Message View layout provides a seamless two-panel chat interface, commonly seen in modern messaging apps like WhatsApp Web, Slack, and Microsoft Teams. This layout allows users to switch between conversations while keeping the active chat open, delivering a smooth, real-time messaging experience.

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Step 1: Render the Conversation Component

The CometChatConversations widget displays all conversations related to the currently logged-in user. Follow the steps below to render this component:
main.dart
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: CometChatConversations(
          showBackButton: true,
          onItemTap: (conversation) {
            
            final target = conversation.conversationWith;

            Navigator.push(
              context,
              MaterialPageRoute(
                builder: (_) => MessagesScreen(
                  user: target is User ? target : null,
                  group: target is Group ? target : null,
                ),
              ),
            );
          },
        ),
      ),
    );
  }

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Full Example: main.dart

main.dart
import 'package:flutter/material.dart';
import 'package:cometchat_chat_uikit/cometchat_chat_uikit.dart';
import 'package:cometchat_calls_uikit/cometchat_calls_uikit.dart'; //Optional: Include if you're using Audio/Video Calling
import 'messages_screen.dart';
import 'cometchat_config.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'CometChat UI Kit',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const Home(),
    );
  }
}

class Home extends StatelessWidget {
  const Home({super.key});

  Future<void> _initializeAndLogin() async {
    final settings = UIKitSettingsBuilder()
      ..subscriptionType = CometChatSubscriptionType.allUsers
      ..autoEstablishSocketConnection = true
      ..appId = CometChatConfig.appId
      ..region = CometChatConfig.region
      ..authKey = CometChatConfig.authKey
      ..extensions = CometChatUIKitChatExtensions.getDefaultExtensions() //Replace this with empty array, if you want to disable all extensions
      ..callingExtension = CometChatCallingExtension(); //Optional: Include if you're using Audio/Video Calling

    await CometChatUIKit.init(uiKitSettings: settings.build());
    await CometChatUIKit.login(
      'cometchat-uid-1',
      onSuccess: (_) => debugPrint('✅ Login Successful'),
      onError: (err) => throw Exception('Login Failed: $err'),
    );
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<void>(
      future: _initializeAndLogin(),
      builder: (ctx, snap) {
        if (snap.connectionState != ConnectionState.done) {
          return const Scaffold(
            body: SafeArea(
              child: Center(child: CircularProgressIndicator()),
            ),
          );
        }
        if (snap.hasError) {
          return Scaffold(
            body: SafeArea(
              child: Center(
                child: Text(
                  'Error starting app:\n${snap.error}',
                  textAlign: TextAlign.center,
                ),
              ),
            ),
          );
        }
        return const ConversationsPage();
      },
    );
  }
}

class ConversationsPage extends StatelessWidget {
  const ConversationsPage({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: CometChatConversations(
          showBackButton: true,
          onItemTap: (conversation) {
            
            final target = conversation.conversationWith;

            Navigator.push(
              context,
              MaterialPageRoute(
                builder: (_) => MessagesScreen(
                  user: target is User ? target : null,
                  group: target is Group ? target : null,
                ),
              ),
            );
          },
        ),
      ),
    );
  }
}

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Step 2: Render the Messages Component

To create a complete messaging view, include the following components in messages_screen.dart:
messages_screen.dart
import 'package:flutter/material.dart';
import 'package:cometchat_chat_uikit/cometchat_chat_uikit.dart';

class MessagesScreen extends StatefulWidget {
  final User? user;
  final Group? group;

  const MessagesScreen({Key? key, this.user, this.group}) : super(key: key);

  @override
  State<MessagesScreen> createState() => _MessagesScreenState();
}

class _MessagesScreenState extends State<MessagesScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: CometChatMessageHeader(
        user: widget.user,
        group: widget.group,
      ),
      body: SafeArea(
        child: Column(
          children: [
            Expanded(
              child: CometChatMessageList(
                user: widget.user,
                group: widget.group,
              ),
            ),
            CometChatMessageComposer(
              user: widget.user,
              group: widget.group,
            ),
          ],
        ),
      ),
    );
  }
}

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Step 3: Run the App

Use the following command to run the app on a connected device or emulator: 
flutter run
This will launch the app and display the Conversation List. Tapping a conversation will navigate to the Message View.

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Next Steps

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Enhance the User Experience