private TextMessage(MessageEntity entity) {
   /** 父类的id */
   id = entity.getId();
   msgId = entity.getMsgId();
   fromId = entity.getFromId();
   toId = entity.getToId();
   sessionKey = entity.getSessionKey();
   content = entity.getContent();
   msgType = entity.getMsgType();
   displayType = entity.getDisplayType();
   status = entity.getStatus();
   created = entity.getCreated();
   updated = entity.getUpdated();
 }
  public void add(MessageEntity msg) {
    // 更新session list中的msg信息
    // 更新未读消息计数
    if (msg == null) {
      logger.d("unread#unreadMgr#add msg is null!");
      return;
    }
    // isFirst场景:出现一条未读消息,出现小红点,需要触发 [免打扰的情况下]
    boolean isFirst = false;
    logger.d("unread#unreadMgr#add unread msg:%s", msg);
    UnreadEntity unreadEntity;
    int loginId = IMLoginManager.instance().getLoginId();
    String sessionKey = msg.getSessionKey();
    boolean isSend = msg.isSend(loginId);
    if (isSend) {
      IMNotificationManager.instance().cancelSessionNotifications(sessionKey);
      return;
    }

    if (unreadMsgMap.containsKey(sessionKey)) {
      unreadEntity = unreadMsgMap.get(sessionKey);
      // 判断最后一条msgId是否相同
      if (unreadEntity.getLaststMsgId() == msg.getMsgId()) {
        return;
      }
      unreadEntity.setUnReadCnt(unreadEntity.getUnReadCnt() + 1);
    } else {
      isFirst = true;
      unreadEntity = new UnreadEntity();
      unreadEntity.setUnReadCnt(1);
      unreadEntity.setPeerId(msg.getPeerId(isSend));
      unreadEntity.setSessionType(msg.getSessionType());
      unreadEntity.buildSessionKey();
    }

    unreadEntity.setLatestMsgData(msg.getMessageDisplay());
    unreadEntity.setLaststMsgId(msg.getMsgId());
    addIsForbidden(unreadEntity);

    /** 放入manager 状态中 */
    unreadMsgMap.put(unreadEntity.getSessionKey(), unreadEntity);

    /** 没有被屏蔽才会发送广播 */
    if (!unreadEntity.isForbidden() || isFirst) {
      UnreadEvent unreadEvent = new UnreadEvent();
      unreadEvent.event = UnreadEvent.Event.UNREAD_MSG_RECEIVED;
      unreadEvent.entity = unreadEntity;
      triggerEvent(unreadEvent);
    }
  }