Is Android using NTP to sync time

Question

Do Android Devices use the network time protocol  NTP  to synchronize the time   In my Device-Settings I see a checkbox with the following text  synchronize with network   but I don t know if they are using NTP   I need this for my Bachelor Thesis for which I use GPS  To get an accurate GPS-signal the receiver should have an exact clock   I have found this blog-entry on the web  but I m not sure if he tells the truth  Speeding up NTP  GPS Lock in Android

User · Answer

I have a Samsung Galaxy Tab 2 7 0 with Android 4 1 1  Apparently it does NOT sync to ntp  I loaded an app that says my tablet is 20 seconds off of ntp  but it can t set it unless I root the device

User · Answer

i wanted to ask if Android Devices uses the network time protocol  ntp  to synchronize the time    For general time synchronization  devices with telephony capability  where the wireless provider provides NITZ information  will use NITZ  My understanding is that NTP is used in other circumstances  NITZ-free wireless providers  WiFi-only  etc   Your cited blog post suggests another circumstance  on-demand time synchronization in support of GPS  That is certainly conceivable  though I do not know whether it is used or not

User · Answer

Not an exact answer to your question  but a bit of information  if your device does use NTP for time  eg  if it is a tablet with no 3G or GPS capabilities   the server can be configured in  system etc gps conf - obviously this file can only be edited with root access  but is viewable on non-rooted devices

User · Answer

I know about Android ICS that it uses a custom service called  NetworkTimeUpdateService  This service also implements a NTP time synchronization via the NtpTrustedTime singleton   In NtpTrustedTime the default NTP server is requested from the Android system string source   final Resources res   context getResources     final String defaultServer   res getString                                  com android internal R string config ntpServer     If the automatic time sync option in the system settings is checked and no NITZ time service is available then the time will be synchronized with the NTP server from com android internal R string config ntpServer   To get the value of com android internal R string config ntpServer you can use the following method       final Resources res   this getResources        final int id   Resources getSystem   getIdentifier                          config ntpServer    string   android        final String defaultServer   res getString id

[android] Is Android using NTP to sync time?

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