Android连接网络立即同步时区

1.frameworks/base/services/core/java/com/android/server/NetworkTimeUpdateService.java
private void onPollNetworkTimeUnderWakeLock(int event) {
if (/省略.../event == EVENT_AUTO_TIME_CHANGED）  
}

改为：
private void onPollNetworkTimeUnderWakeLock(int event) {
if (/省略.../event == EVENT_AUTO_TIME_CHANGED || event == EVENT_NETWORK_CHANGED)   
}

2.frameworks/base/core/res/res/values/config.xml
末尾添加:
<!--NTP time got retry internal time -->
<integer name="config_ntpPollingIntervalShorter">1000</integer>
<!-- NTP time got retry count. -->
<integer name="config_ntpRetry">5</integer>

3.vendor/system.prop
persist.sys.timezone=Asia/Shanghai