Add or remove a user event handler

To receive information about events related to users connected to the Sendbird server, add a user event handler with its unique user-defined ID by calling addUserEventHandler().

If you want to stay informed of changes related to users and notify users' client apps of these changes, define and register multiple user event handlers to each view controller.

The onTotalUnreadMessageCountChanged() attribute is turned off by default. Contact us if you wish to use this feature.

The following code shows a full set of supported event callbacks with their parameters and how to add a user event handler to the SendbirdChat class.

class MyUserEventHandler extends UserEventHandler {
  @override
  void onFriendsDiscovered(List<User> friends) {}

  @override
  void onTotalUnreadMessageCountUpdated(
    int totalCount,
    Map<String, int> customTypesCount,
  ) {}
}

SendbirdChat.addUserEventHandler('UNIQUE_HANDLER_ID', MyUserEventHandler());

The following code shows how to remove the user event handler.

SendbirdChat.removeUserEventHandler('UNIQUE_HANDLER_ID');