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Chat SDKs Flutter v4
Chat SDKs Flutter
Chat SDKs
Version 4

Retrieve number of members who haven't read a message

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Using the getUnreadMembers() method, you can get the number of members who haven't read a specific message in a group channel. To get the most up-to-date value, the channel should first be updated through markAsRead() before calling getUnreadMembers().

try {
  // Call the markAsRead() method when the current user views unread messages in a group channel.
  await groupChannel.markAsRead();
} catch (e) {
  // Handle error.

// To listen to an update from all the other channel members' client apps, implement onReadStatusUpdated() with actions to do when notified.
class MyGroupChannelHandler with GroupChannelHandler {
  void onReadStatusUpdated(GroupChannel channel) {
    if (currentGroupChannel.channelUrl == channel.channelUrl) {
      messages.forEach((message) {
        final unreadCount = channel.getUnreadMembers(message);
        if (unreadCount <= 0) {
          // 0 means that all members have read this message.
        } else {
          // If the value isn't 0, 
          // some members haven't read this message.