http://stackoverflow.com/questions/9310479/how-to-iterate-through-all-keys-of-shared-preferences
getAll 항목이 존재 합니다.
Map<String,?> keys = prefs.getAll(); for(Map.Entry<String,?> entry : keys.entrySet()){ Log.d("map values",entry.getKey() + ": " + entry.getValue().toString()); }