code: public static String getQualifiers() {
      Resources systemResources = Resources.getSystem();
      return getQualifiers(systemResources.getConfiguration(), systemResources.getDisplayMetrics());
    }
docs: Returns a qualifier string describing the current {@link Configuration} of the system resources.
  
  @return a qualifier string as described (https://developer.android.com/guide/topics/resources/providing-resources.html#QualifierRules)[here].