Flutter列表中倒计时-创新互联

1、在实体类中增加Timer类型的字段

bean{Timer timer;
  var countdownSeconds;//倒计时剩余秒数
  String showTimeName;//显示在item中的字符串
}

2、在获取到接口数据后开启倒计时

_httpExpressList(){HttpApplication.getInstance().expressList(callBack: (result){  if(result !=null){var dataList = result['list'] as List;
        var dateNo = DateTime.now();
        for(int i = 0; i< dataList.length; i++){  PromotionExpressItemBean _promotionExpressItemBean = PromotionExpressItemBean.fromJson(dataList[i]);
          var diff = DateCountDownUtil.difference(_promotionExpressItemBean.endTime,dateNo);
          _promotionExpressItemBean.countdownSeconds = diff;
          _promotionExpressItemBean.timer = _startTimer(_promotionExpressItemBean);
          _promotionExpressList.add(_promotionExpressItemBean);
        }
        setState(() {});
      }

    },errorCallBack: (error){});
  }

_cancelTimer(){if(_promotionExpressList.length>0){  for(int i =0;i<_promotionExpressList.length;i++){_promotionExpressList[i].timer.cancel();
      }
    }
  }

  _startTimer(PromotionExpressItemBean promotionExpressItemBean){return Timer.periodic(Duration(seconds: 1), (timer){  promotionExpressItemBean.countdownSeconds -=1;
      promotionExpressItemBean.showTimeName = DateCountDownUtil.constructTime(promotionExpressItemBean.countdownSeconds);
       //DateCountDownUtil转天时分秒的工具类
      if(promotionExpressItemBean.countdownSeconds<=0){promotionExpressItemBean.timer.cancel();
        promotionExpressItemBean.showTimeName="已结束";
      }
      setState(() {  });
    });
  }

  @override
  void dispose() {// TODO: implement dispos
    _cancelTimer();
    super.dispose();
  }

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