Android6.0 禁止自动同步网络时间

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

<bool name="def_auto_time">false </bool>
<bool name="def_auto_time_zone">false </bool>

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

<!-- <SwitchPreference android:key="auto_time"
android:title="@string/date_time_auto"
android:summaryOn="@string/date_time_auto_summaryOn"
android:summaryOff="@string/date_time_auto_summaryOff"
/>
-->

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。