Android6.0 禁止自动同步网络时间

配置文件在：frameworks/base/packages/SettingsProvider/res/values/defaults.xml

    false
    false

直接将def_auto_time 和 def_auto_time_zone设置成false，就不会同步网络时间了。

如果用户去设置中去勾选，还是可以同步时间的，下面将把设置中的自动同步选项移除，

移除packages/apps/Settings/res/xml/date_time_prefs.xml

在packages/apps/Settings/src/com/android/settings/DateTimeSettings.java删除有关获取auto_time的ID的代码。

--- a/packages/apps/Settings/src/com/android/settings/DateTimeSettings.java
+++ b/packages/apps/Settings/src/com/android/settings/DateTimeSettings.java
@@ -93,12 +93,12 @@ public class DateTimeSettings extends SettingsPreferenceFragment
         boolean autoTimeEnabled = getAutoState(Settings.Global.AUTO_TIME);
         boolean autoTimeZoneEnabled = getAutoState(Settings.Global.AUTO_TIME_ZONE);
 
-        mAutoTimePref = (SwitchPreference) findPreference(KEY_AUTO_TIME);
+       // mAutoTimePref = (SwitchPreference) findPreference(KEY_AUTO_TIME);
 
         DevicePolicyManager dpm = (DevicePolicyManager) getSystemService(Context
                 .DEVICE_POLICY_SERVICE);
         if (dpm.getAutoTimeRequired()) {
-            mAutoTimePref.setEnabled(false);
+        //    mAutoTimePref.setEnabled(false);
 
             // If Settings.Global.AUTO_TIME is false it will be set to true
             // by the device policy manager very soon.
@@ -110,7 +110,7 @@ public class DateTimeSettings extends SettingsPreferenceFragment
 
         mDummyDate = Calendar.getInstance();
 
-        mAutoTimePref.setChecked(autoTimeEnabled);
+        //mAutoTimePref.setChecked(autoTimeEnabled);

如果觉得还是不放心，可以直接禁止同步时间的服务

frameworks/base/services/java/com/android/server/SystemServer.java

在这里找到NetworkTimeUpdateService把相关代码注释掉就可以。