// 设置在线和离线都不接收消息

TencentImSDKPlugin.v2TIMManager.getMessageManager().setC2CReceiveMessageOpt(userIDList: ['user1','user2'], opt: ReceiveMsgOptEnum.V2TIM_NOT_RECEIVE_MESSAGE);

V2TimValueCallback<List<V2TimReceiveMessageOptInfo>> messageOpt = await TencentImSDKPlugin.v2TIMManager.getMessageManager().getC2CReceiveMessageOpt(userIDList: ['user1','user2']);
  messageOpt.data.forEach((element) {
    // 接收消息选项
    element.c2CReceiveMessageOpt;
    element.userID;
  });

TencentImSDKPlugin.v2TIMManager.getMessageManager().setGroupReceiveMessageOpt(groupID: "groupID", opt: ReceiveMsgOptEnum.V2TIM_NOT_RECEIVE_MESSAGE);

V2TimValueCallback<List<V2TimGroupInfoResult>> groups = await TencentImSDKPlugin.v2TIMManager.getGroupManager().getGroupsInfo(groupIDList: ['groupID']);
  groups.data.forEach((element) { 
    // 获取群组的接收消息选项
    element.groupInfo.recvOpt;
  });