https://stackoverflow.com/questions/7361627/how-can-write-code-to-make-sharedpreferences-for-array-in-android stackoverflow 에 올라온 코드를 참조해 제네릭하게 만들어 봤습니다. 사용법은 아래와 같습니다. val sharedPref = getSharedPreferences("config", MODE_PRIVATE) setArrayPref<String>(sharedPref, "testList ", <<inList>> ) val testList = getArrayPref<String>(sharedPref, "testList") fun < T > setArrayPref (prefs: SharedPreferences , key: String , values: MutableList< T >) { val editor = prefs.edit() val jArray = JSONArray() for (i in 0 until values. size ) { jArray.put(values[i]) } if (values. isNotEmpty ()) { editor.putString(key , jArray.toString()) } else { editor.putString(key , null ) } editor.commit() } fun < T > getArrayPref (prefs: SharedPreferences , key: String): MutableList< T > { val json = prefs.getString(key , null ) val list = mutableListOf < T >() if (json...