Android : How to add arabic language in my android applicaiton

In my application has language selection option either english or arabic. if user selects the english the application static text will be in english , if user selects the arabic the hole application text will be in arabic.

i have tried see my below code

`Configuration configuration = new Configuration();
    switch(view.getId())
    {
    case R.id.language_arabic:
        configuration.locale = Locale.getDefault(). here is my doubt(what the code will come here)
        break;
    case R.id.language_english:
        configuration.locale = Locale.ENGLISH;
        break;
        default:
    }
    getResources().updateConfiguration(configuration, null);`

FOR english locale has the option to select the locale.english . but how can i choose the arabic language.

i have created two values folder for arabic values-ar in that i have string.xml files with arabic values. how can i call this can any one help