android NTP服务器设置

更改 Android 设备 NTP 服务器

adb shell setprop persist.sys.timezone Asia/Shanghai

adb shell settings put global ntp_server ntp.aliyun.com
adb shell settings get global ntp_server
adb reboot

手机重启联网自动校时

NPT 服务器列表
Area 　　　　 　　   HostName

Worldwide 　　 　　 pool.ntp.org
Asia 　　　　　　　 asia.pool.ntp.org
Europe 　　　　　　europe.pool.ntp.org
North America 　　　north-america.pool.ntp.org
Oceania 　　　　　  oceania.pool.ntp.org
South America 　　   south-america.pool.ntp.org

阿里云

https://help.aliyun.com/document_detail/92704.html

• ntp.aliyun.com
• ntp1.aliyun.com
• ntp2.aliyun.com
• ntp3.aliyun.com
• ntp4.aliyun.com
• ntp5.aliyun.com
• ntp6.aliyun.com
• ntp7.aliyun.com

Google

https://developers.google.com/time

• time1.google.com
• time2.google.com
• time3.google.com
• time4.google.com

CloudFlare

https://www.cloudflare.com/time/

• time.cloudflare.com

Microsoft

• time.windows.com

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ntp android source code and configs:

https://android.googlesource.com/platform/frameworks/base/+/android-6.0.1_r21/core/res/res/values/config.xml

<string translatable="false" name="config_ntpServer">2.android.pool.ntp.org</string>

https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/util/NtpTrustedTime.java

public class NtpTrustedTime implements TrustedTime {
    ...
    public static synchronized NtpTrustedTime getInstance(Context context) {
        if (sSingleton == null) {
            final Resources res = context.getResources();
            final ContentResolver resolver = context.getContentResolver();
            final String defaultServer = res.getString(
                    com.android.internal.R.string.config_ntpServer);
            final long defaultTimeout = res.getInteger(
                    com.android.internal.R.integer.config_ntpTimeout);
            final String secureServer = Settings.Global.getString(
                    resolver, Settings.Global.NTP_SERVER);
            final long timeout = Settings.Global.getLong(
                    resolver, Settings.Global.NTP_TIMEOUT, defaultTimeout);
            final String server = secureServer != null ? secureServer : defaultServer;
            sSingleton = new NtpTrustedTime(server, timeout);
            sContext = context;
        }
        return sSingleton;
    }
}

refs:

https://liuzesen.com/2020/05/10/%E6%9B%B4%E6%94%B9Android%E8%AE%BE%E5%A4%87NTP%E6%9C%8D%E5%8A%A1%E5%99%A8/

https://zhuanlan.zhihu.com/p/32518769

---

android 系统时间不同步问题

https://android.googlesource.com/platform/frameworks/base/+/android-6.0.1_r21/core/res/res/values/config.xml
<!-- Remote server that can provide NTP responses. -->
<string translatable="false" name="config_ntpServer">2.android.pool.ntp.org</string>

https://android.googlesource.com/platform/frameworks/base/+/40caf8f4432acd2b9d9230b2b1371660521415c2%5E%21/
diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
<!-- Remote server that can provide NTP responses. -->
- <string translatable="false" name="config_ntpServer">pool.ntp.org</string>
+ <string translatable="false" name="config_ntpServer">2.android.pool.ntp.org</string>
<!-- Timeout to wait for NTP server response. -->
<integer name="config_ntpTimeout">20000</integer>

https://www.jianshu.com/p/bef02e8ecf17

国内的将服务器地址改为中国的

修改代码：

LINUX/android/frameworks/base/core/res/res/values/config.xml

-<stringtranslatable="false"name="config_ntpServer">time.android.com</string>

+<stringtranslatable="false"name="config_ntpServer">cn.pool.ntp.org</string>

将时间同步频率增加：

- <integer name="config_ntpPollingIntervalShorter">60000</integer>

+ <integer name="config_ntpPollingIntervalShorter">1000</integer>

- <integer name="config_ntpRetry">3</integer>

+ <integer name="config_ntpRetry">10</integer>