?????????????????????????????
????????1.???????????????????countDownNum????APP?????????е??????????????????????1????????????С??0??????????С??0?????????A??
?????????A?????countDownNum > 0 ???????????????A????countDownNu <= 0??????????????????A??
??????????￡???????????
??????countDownNum?е???3???????1.????????A ??2.??????????3.??????
?????У??????????????????APP?????1?????????A???????
?????????2??????????A????????????3?????????A???????????????????
???????????????A???????????????????????????????????1????2??countDownNum???????0?????????????????2?????Σ?
???????????A???????isShowA??????????????isCountDownStart??
??????????￡???????????????3???????????????3???????????????????????????????????
??????????????????β????????????????
????????1???????????APP???????Σ??????????????????isShow?????????????????????????text????
?????????A??????text??????????棬?????????????棬??????????????text?????
??????????????????????????????text?????2?????????????text??isShow????????????
??????isShow????????????Ч?????????????????????????????????е??????
????????????????????
???????ε?????????????????APP????????????????????????????У?????????κε???????
?????????????????????????????????APP????A1~A100?????Σ?????boolean???????A1?true?
????A2?????Ч??A3?true?A4???????......????A100?????????????????????????????
????bug????????
????????????????????????????????????????????檔