Shared Preference

Hello, i have a question about shared preferences. In my app, user can choose language in settings. How can i retrieve the language?

i write the next code in onCreate:

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
String myPref = prefs.getString("language", "empty");
if mypref.equals("empty") {
... todo
}

But if the user change language during using app. I have to write the same code in onResume, to get the updated values?

Thank you