MTK 如何更改NTP 服务器地址

tangh

How to add custom NTP server

[DESCRIPTION]
       When use AUTO-Time through network, Android will update system time from NTP server. The default server is "time.android.com". In some region handset can't connect to this server every time, Then handset will take several minutes to synchronize time or even failed. We may want to change to an internal server to get better performance.

[SOLUTION]
How to change server address?
There are three ways:
1. Change Android default server address. Replace value "config_ntpServer" in "/frameworks/base/core/res/res/values/config.xml" with your own server address.
2. Overlay Android default server address. Add new file in "/device/mediatek/system/common/overlay/ntp/frameworks/base/core/res/res/values/config.xml", overlay value "config_ntpServer" with your own server address, add this path to PRODUCT_PACKAGE_OVERLAYS in device.mk.
3. Add your server in NetworkTimeUpdateService.java. use ((NtpTrustedTime) mTime).setServer(custom_server) to set custom NTP server before call mTime.forceRefresh(). Then
      NtpTrustedTime will connect to custom_server to update time.

How to verify modify?
initialization:
       Make sure handset can access internet, enter settings -> Date & time, enable Automatic time from network. Disable Automatic time zone.
      
test:
       reboot phone, check mainlog/syslog:

1. 07-12 08:56:09.770370   943   943 D NtpTrustedTime: getServer:[time.android.com]   // this address should be custom server
   
2. 07-12 08:57:07.184321   943  1172 D NetworkTimeUpdateService: New default network 100; checking time.
   
3. 07-12 08:57:07.184816   943  1172 D NetworkTimeUpdateService: onPollNetworkTime start
   
4. 07-12 08:57:07.191897   943  1172 D NetworkTimeUpdateService: Stale NTP fix; forcing refresh
   
5. 07-12 08:57:07.192420   943  1172 D NetworkTimeUpdateService: mTryAgainCounter = 0;mNtpServers.size() = 3;index = 0;mNtpServers = time.android.com
   
6. 07-12 08:57:07.192835   943  1172 D NtpTrustedTime: setServer:[time.android.com]
   
7. 07-12 08:57:07.555810   943  1172 D SntpClient: round trip: 84ms, clock offset: 200ms  // means success

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