android 菜单不显示auto time zone菜单

packages\apps\Settings\res\xml\date_time_prefs.xml 

有对应的xml

packages\apps\Settings\src\com\android\settings\datetime\AutoTimeZonePreferenceController.java 

@Overridepublic boolean isAvailable() {if (mIsFromSUW) {return false;}TimeZoneCapabilities timeZoneCapabilities =getTimeZoneCapabilitiesAndConfig().getCapabilities();int capability = timeZoneCapabilities.getConfigureAutoDetectionEnabledCapability();// The preference only has two states: present and not present. The preference is never// present but disabled.if (capability == CAPABILITY_NOT_SUPPORTED|| capability == CAPABILITY_NOT_ALLOWED|| capability == CAPABILITY_NOT_APPLICABLE) {return false;} else if (capability == CAPABILITY_POSSESSED) {return true;} else {throw new IllegalStateException("Unknown capability=" + capability);}}

打印 日志发现，capability == CAPABILITY_NOT_SUPPORTED

查看哪里设置了CAPABILITY_NOT_SUPPORTED

frameworks\base\services\core\java\com\android\server\timezonedetector\ConfigurationInternal.java

  /** Returns true if the device supports any form of auto time zone detection. */public boolean isAutoDetectionSupported() {return mTelephonyDetectionSupported || mGeoDetectionSupported;}/** Returns true if the device supports telephony time zone detection. */public boolean isTelephonyDetectionSupported() {return mTelephonyDetectionSupported;}/** Returns true if the device supports geolocation time zone detection. */public boolean isGeoDetectionSupported() {return mGeoDetectionSupported;}