> ## Documentation Index
> Fetch the complete documentation index at: https://wukong.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Channel Management

> WuKongIM Flutter SDK channel management functionality, including channel information retrieval and monitoring

Channel is an abstract concept in WuKongIM. Messages are first sent to channels, and channels deliver messages according to their configuration rules. Channels are divided into channel and channel details. For more information, please refer to [What is a Channel](/en/guide/initialize#channels).

## Data Source

`Need to implement channel information data source` [Channel Information Data Source](/en/sdk/wukongim/flutter/datasource#channel-information-data-source)

## Channel Information

### Get Channel Information

```dart theme={null}
// Get channel information
WKIM.shared.channelManager.getChannel(String channelID, int channelType);
```

### Force Refresh Channel Information

```dart theme={null}
// Force refresh channel information
WKIM.shared.channelManager.fetchChannelInfo(String channelID, int channelType)
```

## Events

### Listen for Channel Update Events

```dart theme={null}
// Listen for channel refresh events
WKIM.shared.channelManager.addOnRefreshListener('key', (wkChannel) {
    // Refresh corresponding channel information
});

// Remove listener
WKIM.shared.channelManager.removeOnRefreshListener('key');
```

<Note>
  The key is a unique identifier for the listener, can be any string. The same key must be used when adding and removing listeners.
</Note>

## Common Methods

```dart theme={null}
// Batch save channel information
WKIM.shared.channelManager.addOrUpdateChannels(List<WKChannel> channelList);

// Search
WKIM.shared.channelManager.search(String keyword);
```

## Complete Channel Management Example

```dart theme={null}
class ChannelManager {
  static final ChannelManager _instance = ChannelManager._internal();
  factory ChannelManager() => _instance;
  ChannelManager._internal();
  
  final Map<String, WKChannel> _channelCache = {};
  final StreamController<WKChannel> _channelUpdateController = StreamController.broadcast();
  
  // Stream for UI to listen
  Stream<WKChannel> get channelUpdateStream => _channelUpdateController.stream;
  
  void initialize() {
    _setupChannelListener();
  }
  
  void _setupChannelListener() {
    // Listen for channel refresh
    WKIM.shared.channelManager.addOnRefreshListener('global', (wkChannel) {
      _handleChannelUpdate(wkChannel);
    });
  }
  
  void _handleChannelUpdate(WKChannel channel) {
    final channelKey = '${channel.channelID}_${channel.channelType}';
    _channelCache[channelKey] = channel;
    
    // Notify listeners
    _channelUpdateController.add(channel);
  }
  
  // Get channel with caching
  WKChannel? getChannelWithCache(String channelID, int channelType) {
    final channelKey = '${channelID}_$channelType';
    
    // First check cache
    if (_channelCache.containsKey(channelKey)) {
      return _channelCache[channelKey];
    }
    
    // Get from SDK
    final channel = WKIM.shared.channelManager.getChannel(channelID, channelType);
    if (channel != null) {
      _channelCache[channelKey] = channel;
      return channel;
    }
    
    // Trigger network request
    fetchChannelInfo(channelID, channelType);
    return null;
  }
  
  // Force refresh channel information
  void fetchChannelInfo(String channelID, int channelType) {
    WKIM.shared.channelManager.fetchChannelInfo(channelID, channelType);
  }
  
  // Batch save channels
  void saveChannels(List<WKChannel> channels) {
    WKIM.shared.channelManager.addOrUpdateChannels(channels);
    
    // Update cache
    for (var channel in channels) {
      final channelKey = '${channel.channelID}_${channel.channelType}';
      _channelCache[channelKey] = channel;
    }
  }
  
  // Search channels
  List<WKChannel> searchChannels(String keyword) {
    return WKIM.shared.channelManager.search(keyword);
  }
  
  // Get channel display name
  String getChannelDisplayName(WKChannel channel) {
    return channel.channelRemark.isNotEmpty 
        ? channel.channelRemark 
        : (channel.channelName.isNotEmpty ? channel.channelName : channel.channelID);
  }
  
  // Check if channel is online
  bool isChannelOnline(WKChannel channel) {
    return channel.online == 1;
  }
  
  // Check if channel is muted
  bool isChannelMuted(WKChannel channel) {
    return channel.mute == 1;
  }
  
  // Check if channel is pinned
  bool isChannelPinned(WKChannel channel) {
    return channel.top == 1;
  }
  
  // Get channel type text
  String getChannelTypeText(int channelType) {
    switch (channelType) {
      case WKChannelType.personal:
        return 'Personal';
      case WKChannelType.group:
        return 'Group';
      default:
        return 'Unknown';
    }
  }
  
  // Get channel avatar URL
  String getChannelAvatarUrl(WKChannel channel) {
    if (channel.avatar.isNotEmpty) {
      final cacheKey = channel.avatarCacheKey.isNotEmpty ? '?v=${channel.avatarCacheKey}' : '';
      return '${channel.avatar}$cacheKey';
    }
    return _getDefaultAvatar(channel.channelID);
  }
  
  String _getDefaultAvatar(String channelID) {
    return 'https://ui-avatars.com/api/?name=$channelID&background=random';
  }
  
  // Format last offline time
  String formatLastOfflineTime(int lastOffline) {
    if (lastOffline == 0) return 'Never';
    
    final date = DateTime.fromMillisecondsSinceEpoch(lastOffline * 1000);
    final now = DateTime.now();
    final difference = now.difference(date);
    
    if (difference.inMinutes < 1) return 'Just now';
    if (difference.inMinutes < 60) return '${difference.inMinutes} minutes ago';
    if (difference.inHours < 24) return '${difference.inHours} hours ago';
    if (difference.inDays < 7) return '${difference.inDays} days ago';
    
    return '${date.month}/${date.day}/${date.year}';
  }
  
  // Get device flag text
  String getDeviceFlagText(int deviceFlag) {
    switch (deviceFlag) {
      case 0: return 'APP';
      case 1: return 'WEB';
      case 2: return 'PC';
      default: return 'Unknown';
    }
  }
  
  // Check if channel allows invites
  bool canInviteMembers(WKChannel channel) {
    return channel.invite == 1;
  }
  
  // Check if channel has receipt enabled
  bool hasReceiptEnabled(WKChannel channel) {
    return channel.receipt == 1;
  }
  
  // Check if channel is a robot
  bool isRobotChannel(WKChannel channel) {
    return channel.robot == 1;
  }
  
  // Clear channel cache
  void clearChannelCache() {
    _channelCache.clear();
  }
  
  void dispose() {
    _channelUpdateController.close();
    WKIM.shared.channelManager.removeOnRefreshListener('global');
  }
}
```

## Data Structure Description

```dart theme={null}
class WKChannel {
  String channelID = "";
  int channelType = WKChannelType.personal;
  String channelName = "";
  // Channel remark (channel's remark name, personal remark for individuals, group alias for groups)
  String channelRemark = "";
  int showNick = 0;
  // Whether pinned
  int top = 0;
  // Whether saved in contacts
  int save = 0;
  // Do not disturb
  int mute = 0;
  // Forbidden
  int forbidden = 0;
  // Invite confirmation
  int invite = 0;
  // Channel status [1: normal 2: blacklist]
  int status = 1;
  // Whether followed 0: not followed (stranger) 1: followed (friend)
  int follow = 0;
  // Whether deleted
  int isDeleted = 0;
  // Creation time
  String createdAt = "";
  // Update time
  String updatedAt = "";
  // Channel avatar
  String avatar = "";
  // Version
  int version = 0;
  // Extension fields
  dynamic localExtra;
  // Whether online
  int online = 0;
  // Last offline time
  int lastOffline = 0;
  // Last offline device flag
  int deviceFlag = 0;
  // Whether receipt message
  int receipt = 0;
  // Robot
  int robot = 0;
  // Category [service: customer service]
  String category = "";
  String username = "";
  String avatarCacheKey = "";
  dynamic remoteExtraMap;
  String parentChannelID = "";
  int parentChannelType = 0;
}
```

## UI Integration Example

```dart theme={null}
class ChannelInfoWidget extends StatefulWidget {
  final String channelID;
  final int channelType;
  
  const ChannelInfoWidget({
    Key? key,
    required this.channelID,
    required this.channelType,
  }) : super(key: key);
  
  @override
  _ChannelInfoWidgetState createState() => _ChannelInfoWidgetState();
}

class _ChannelInfoWidgetState extends State<ChannelInfoWidget> {
  WKChannel? _channel;
  late StreamSubscription<WKChannel> _channelSubscription;
  
  @override
  void initState() {
    super.initState();
    _loadChannelInfo();
    _setupChannelListener();
  }
  
  void _loadChannelInfo() {
    _channel = ChannelManager().getChannelWithCache(widget.channelID, widget.channelType);
    if (mounted) setState(() {});
  }
  
  void _setupChannelListener() {
    _channelSubscription = ChannelManager().channelUpdateStream.listen((channel) {
      if (channel.channelID == widget.channelID && channel.channelType == widget.channelType) {
        setState(() {
          _channel = channel;
        });
      }
    });
  }
  
  @override
  void dispose() {
    _channelSubscription.cancel();
    super.dispose();
  }
  
  @override
  Widget build(BuildContext context) {
    if (_channel == null) {
      return const Center(child: CircularProgressIndicator());
    }
    
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                CircleAvatar(
                  radius: 30,
                  backgroundImage: NetworkImage(
                    ChannelManager().getChannelAvatarUrl(_channel!),
                  ),
                ),
                const SizedBox(width: 16),
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        ChannelManager().getChannelDisplayName(_channel!),
                        style: const TextStyle(
                          fontSize: 18,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                      const SizedBox(height: 4),
                      Text(
                        ChannelManager().getChannelTypeText(_channel!.channelType),
                        style: TextStyle(
                          color: Colors.grey[600],
                        ),
                      ),
                    ],
                  ),
                ),
                if (ChannelManager().isChannelOnline(_channel!))
                  Container(
                    width: 12,
                    height: 12,
                    decoration: const BoxDecoration(
                      color: Colors.green,
                      shape: BoxShape.circle,
                    ),
                  ),
              ],
            ),
            const SizedBox(height: 16),
            _buildInfoRow('Status', ChannelManager().isChannelOnline(_channel!) ? 'Online' : 'Offline'),
            if (!ChannelManager().isChannelOnline(_channel!))
              _buildInfoRow('Last Seen', ChannelManager().formatLastOfflineTime(_channel!.lastOffline)),
            _buildInfoRow('Muted', ChannelManager().isChannelMuted(_channel!) ? 'Yes' : 'No'),
            _buildInfoRow('Pinned', ChannelManager().isChannelPinned(_channel!) ? 'Yes' : 'No'),
            if (ChannelManager().isRobotChannel(_channel!))
              _buildInfoRow('Type', 'Robot'),
          ],
        ),
      ),
    );
  }
  
  Widget _buildInfoRow(String label, String value) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 4.0),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Text(
            label,
            style: TextStyle(
              color: Colors.grey[600],
            ),
          ),
          Text(
            value,
            style: const TextStyle(
              fontWeight: FontWeight.w500,
            ),
          ),
        ],
      ),
    );
  }
}
```

## Next Steps

<CardGroup cols={2}>
  <Card title="Channel Member Management" icon="users" href="/en/sdk/wukongim/flutter/channel_member">
    Learn how to manage channel members
  </Card>

  <Card title="Data Source Configuration" icon="database" href="/en/sdk/wukongim/flutter/datasource">
    Configure channel data sources
  </Card>

  <Card title="Message Management" icon="message-circle" href="/en/sdk/wukongim/flutter/message">
    Return to message handling functionality
  </Card>

  <Card title="Advanced Features" icon="cog" href="/en/sdk/wukongim/flutter/advance">
    Explore advanced features and custom messages
  </Card>
</CardGroup>