在Android2.3.4系统中,Settings->Date & time->Automatic项打上后,时间会通过网络进行同步,而Android默认使用的是NITZ来获取移动网络时间,需要有移动网络服务 商的支持才能使用,而有些Android产品只支持WIFI等无线网络,而不支持移动网络,此时就需要采用SNTP方式来获取网络时间进行同步了,相应需 要修改到的文件为frameworks/base/telephony/java/com/android/internal/telephony /cdma/CdmaServiceStateTracker.java和frameworks/base/telephony/java/com/android/internal/telephony/gsm/GsmServiceStateTracker.java这两个文件,需要修改的都是一样的内容,如下:
添加如下内容: import android.net.SntpClient; 修改如下内容: 把 private void revertToNitz() { if (Settings.System.getInt(phone.getContext().getContentResolver(), Settings.System.AUTO_TIME, 0) == 0) { return; } Log.d(LOG_TAG, "Reverting to NITZ: tz='" + mSavedTimeZone + "' mSavedTime=" + mSavedTime + " mSavedAtTime=" + mSavedAtTime); if (mSavedTimeZone != null && mSavedTime != 0 && mSavedAtTime != 0) { setAndBroadcastNetworkSetTimeZone(mSavedTimeZone); setAndBroadcastNetworkSetTime(mSavedTime + (SystemClock.elapsedRealtime() - mSavedAtTime)); } } 修改为: private void revertToNitz() { if (Settings.System.getInt(phone.getContext().getContentResolver(), Settings.System.AUTO_TIME, 0) == 0) { return; } Log.d(LOG_TAG, "Reverting to NITZ: tz='" + mSavedTimeZone + "' mSavedTime=" + mSavedTime + " mSavedAtTime=" + mSavedAtTime); if (mSavedTimeZone != null && mSavedTime != 0 && mSavedAtTime != 0) { setAndBroadcastNetworkSetTimeZone(mSavedTimeZone); setAndBroadcastNetworkSetTime(mSavedTime + (SystemClock.elapsedRealtime() - mSavedAtTime)); return; } int tryCount = 5; SntpClient client = new SntpClient(); Log.i(LOG_TAG, "revertToNitz new sntpclient"); for(int i = 0; i < tryCount; i++){ if(client.requestTime("north-america.pool.ntp.org", 10000)) { long cachedNtp = client.getNtpTime(); long cachedNtpTimestamp = SystemClock.elapsedRealtime(); Log.i(LOG_TAG, "Sntp NtpTime = " + cachedNtp); setAndBroadcastNetworkSetTime(cachedNtp + (SystemClock.elapsedRealtime() - client.getNtpTimeReference())); return; } } }
north-america.pool.ntp.org是服务器地址,是北美地区的,当然也可以用国内的比如:ntp.api.bz
网上时间更新的文章有很多,http://www.cnblogs.com/AdiSky/archive/2012/11/29/2795168.html 这个文章讲的相当不错!