android 设置设置中Region & Time Zone

packages\apps\Settings\res\xml\time_zone_prefs.xml

android:key="time_zone_region_preference_category">
android:key="region"
android:title="@string/date_time_select_region"
android:summary="@string/summary_placeholder" />
android:key="region_zone"
android:title="@string/date_time_set_timezone_title"
android:summary="@string/summary_placeholder" />
android:key="footer_preference"
settings:controller="com.android.settings.datetime.timezone.TimeZoneInfoPreferenceController" />

packages\apps\Settings\src\com\android\settings\datetime\timezone\TimeZoneSettings.java

protected int getPreferenceScreenResId() {
return R.xml.time_zone_prefs;
}

packages\apps\Settings\src\com\android\settings\datetime\timezone\RegionSearchPicker.java

//创建Region list view ，并添加item 点击事件

protected BaseTimeZoneAdapter createAdapter(TimeZoneData timeZoneData) {    mTimeZoneData = timeZoneData;    mAdapter = new BaseTimeZoneAdapter<>(createAdapterItem(timeZoneData.getRegionIds()),            this::onListItemClick, getLocale(), false /* showItemSummary */,                null /* headerText */);    return mAdapter;}

用户点击，保存Region 和Zone

packages\apps\Settings\src\com\android\settings\datetime\timezone\TimeZoneSettings.java

private void saveTimeZone(String regionId, String tzId) {    SharedPreferences.Editor editor = getPreferenceManager().getSharedPreferences().edit();    if (regionId == null) {        editor.remove(PREF_KEY_REGION);    } else {        editor.putString(PREF_KEY_REGION, regionId);    }    editor.apply();    getActivity().getSystemService(AlarmManager.class).setTimeZone(tzId);}

libcore/luni/src/main/java/libcore/util/import libcore.util.CountryTimeZones;CountryZonesFinder.java表示所有的区域（Region）TimeZoneFinder.java  这里通过 getCountryZonesFinder 来创建 CountryZonesFinder

getCountryZonesFinder 处理 /system/usr/share/zoneinfo/tzlookup.xml 这个文件

public CountryZonesFinder getCountryZonesFinder() {    CountryZonesLookupExtractor extractor = new CountryZonesLookupExtractor();    try {        processXml(extractor);        return extractor.getCountryZonesLookup();    } catch (XmlPullParserException | IOException e) {        System.logW("Error reading country zones ", e);        return null;    }}

/system/usr/share/zoneinfo/tzdata

/system/usr/share/zoneinfo/tzlookup.xml 这个文件记录了区域的code 并对应的时区

/** * @return the country from the system's locale. */protected Country getLocaleCountry() {    Locale defaultLocale = Locale.getDefault();    if (defaultLocale != null) {        return new Country(defaultLocale.getCountry(), Country.COUNTRY_SOURCE_LOCALE);    } else {        return null;    }}

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