zero.dart

  void startListenEvent() {
    // Callback for updates on the status of other users in the room.
    // Users can only receive callbacks when the isUserStatusNotify property of ZegoRoomConfig is set to `true` when logging in to the room (loginRoom).
    ZegoExpressEngine.onRoomUserUpdate =
        (roomID, updateType, List<ZegoUser> userList) {};
    // Callback for updates on the status of the streams in the room.
    ZegoExpressEngine.onRoomStreamUpdate =
        (roomID, updateType, List<ZegoStream> streamList, extendedData) {

      if (updateType == ZegoUpdateType.Add) {
        for (final stream in streamList) {
          startPlayStream(stream.streamID);
        }
      } else {
        for (final stream in streamList) {
          stopPlayStream(stream.streamID);
        }
      }
    };
    // Callback for updates on the current user's room connection status.
    ZegoExpressEngine.onRoomStateUpdate =
        (roomID, state, errorCode, extendedData) {
      debugPrint(
          'onRoomStateUpdate: roomID: $roomID, state: ${state.name}, errorCode: $errorCode, extendedData: $extendedData');
    };

    // Callback for updates on the current user's stream publishing changes.
    ZegoExpressEngine.onPublisherStateUpdate =
        (streamID, state, errorCode, extendedData) {
      debugPrint(
          'onPublisherStateUpdate: streamID: $streamID, state: ${state.name}, errorCode: $errorCode, extendedData: $extendedData');
    };

    ZegoExpressEngine.onCapturedDataRecordStateUpdate =
        (state, errorCode, configID, channel) {
      print('_AdvancedVideoCallHolderState.startListenEvent $state');
      debugPrint(
          'onCapturedDataRecordStateUpdate: state: ${state.name}, errorCode: $errorCode, configID: $configID');
    };
  }