Merge #252 into sdk602patch0521 from refs/changes/252/head

Merge #252 into sdk602patch0521 from refs/changes/252/head

Code review from 胡传军

* refs/changes/252/head: (5 commits squashed)

  - 获取N天前日期

  - 增加传输中UI

  - 增加OTA传输中的进度条

  - Merge branch 'sdk602patch0521' of https://codeup.aliyun.com/64191456b9581d62e8f81ac0/FD230 into sdk602patch0521

  - 修复闹钟取消后依然会响的bug

Signed-off-by: aliyun8003852482 <1224667075@qq.com>
Reviewed-by: snickersun@163.com <accounts_62b90f7fcf51ade33b6f628e@mail.teambition.com>
Merged-by: snickersun@163.com <accounts_62b90f7fcf51ade33b6f628e@mail.teambition.com>
link: https://codeup.aliyun.com/64191456b9581d62e8f81ac0/FD230/change/252