get the application's resources languages

Question

Is it possible, at runtime, to know which resources languages are embedded in my app?

i.e the presence of this folders:

values-en
values-de
values-fr         


        

Answer 1

Inspired by the answers above I created a simple method to get all app's languages based on provided translations:

public static Set getAppLanguages( Context ctx, int id ) {
  DisplayMetrics dm = ctx.getResources().getDisplayMetrics();
  Configuration conf = ctx.getResources().getConfiguration();
  Locale originalLocale = conf.locale;
  conf.locale = Locale.ENGLISH;
  final String reference = new Resources( ctx.getAssets(), dm, conf ).getString( id );

  Set result = new HashSet<>();
  result.add( Locale.ENGLISH.getLanguage() );

  for( String loc : ctx.getAssets().getLocales() ){
    if( loc.isEmpty() ) continue;
    Locale l = Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT_WATCH ? new Locale( loc.substring( 0, 2 ) ) : Locale.forLanguageTag( loc );
    conf.locale = l;
    if( !reference.equals( new Resources( ctx.getAssets(), dm, conf ).getString( id ) ) ) result.add( l.getLanguage() );
  }
  conf.locale = originalLocale;
  return result; 
}

where as id arg should be used a R.string.some_message which is provided in all translations and contains clearly distinguishable text, like "Do you really want to delete the object?"

Maybe it would help someone...