android系统刷完机器后，如果连上网络，默认会从服务器更新时间，但常常概率性的有机器等待很久才会更新或不更新时间
减少从服务器拉取时间间隔，加大拉取时间的次数
修改点：
frameworks/base/core/res/res/values/config.xml
<integer name="config_ntpPollingInterval">86400000</integer>
<!-- Try-again polling interval in milliseconds, in case the network request failed -->
- <integer name="config_ntpPollingIntervalShorter">60000</integer>
+ <integer name="config_ntpPollingIntervalShorter">1000</integer>
<!-- Number of times to try again with the shorter interval, before backing
off until the normal polling interval. A value < 0 indicates infinite. -->
<!-- Number of times to try again with the shorter interval, before backing
off until the normal polling interval. A value < 0 indicates infinite. -->
- <integer name="config_ntpRetry">3</integer>
+ <integer name="config_ntpRetry">5</integer>
