Fix race condition while changing the system locale

     * @param newLocale the locale to change to.

     * @return the old locale.

     */

    public static Locale setSystemLocale(final Resources res, final Locale newLocale) {

    public static synchronized Locale setSystemLocale(final Resources res, final Locale newLocale) {

        final Configuration conf = res.getConfiguration();

        final Locale saveLocale = conf.locale;

        final Locale oldLocale = conf.locale;

        if (newLocale != null && !newLocale.equals(oldLocale)) {

            conf.locale = newLocale;

            res.updateConfiguration(conf, res.getDisplayMetrics());

        return saveLocale;

        }

        return oldLocale;

    }

    private static final HashMap<String, Locale> sLocaleCache = new HashMap<String, Locale>();