问如何从使用timeZone选择的区域获取android.icu.util

EN

@RequiresApi(api = Build.VERSION_CODES.N)
    public void getTimeZoneByCountryCode(){
        //Retrieves the selected Region
        String _region = mRegion.getSelectedItem().toString();

        //Uses selected region for time zone!
        timeZone = TimeZone.getAvailableIDs(getCountryCodeFromName(_region));

        //Time Zone Adapter
        ArrayAdapter<String> timeZoneAdapter = new ArrayAdapter<String>(getActivity(),
                R.layout.spinner_item, timeZone);
        timeZoneAdapter.setDropDownViewResource(R.layout.spinner_dropdown_item);

        mTimeZone.setAdapter(timeZoneAdapter);
    }

    @RequiresApi(api = Build.VERSION_CODES.N)
    public void getCountryName(){
        Locale[] locale = Locale.getAvailableLocales();
        regions = new ArrayList<String>();

        for (Locale loc : locale) {
            region = loc.getDisplayCountry();

            Log.e("Country",""+region);
            if (region.length() > 0 && !regions.contains(region)) {
                regions.add(region);
            }
        }
        Log.d(TAG, "onActivityCreated: " + regions);
        Collections.sort(regions, String.CASE_INSENSITIVE_ORDER);
    }

    @RequiresApi(api = Build.VERSION_CODES.N)
    public static String getCountryCodeFromName(String country) {
        return Arrays.asList(Locale.getISOCountries())
                .stream()
                .map((s) -> new Locale("", s))
                .filter((l) -> l.getDisplayCountry().toLowerCase().equals(country.toLowerCase()))
                .findFirst()
                .map((l) -> l.getCountry().toLowerCase())
                .orElse("UNKNOWN");
    }