# Android 데이터 관리 (Android)

> SharedPreferences, DataStore, File I/O, Internal/External Storage, Scoped Storage

- 29 면접 질문
- Junior
- [면접 질문: Android](https://sharpskill.dev/ko/technologies/android/interview-questions.md)

## 1. Android에서 SharedPreferences란 무엇입니까?

**답변**

SharedPreferences는 기본 데이터(int, boolean, float, long, String, Set<String>)를 저장하기 위한 간단한 키-값 저장 시스템입니다. 데이터는 앱 세션과 재부팅 사이에 유지됩니다. 사용자 환경설정, 설정, 작은 데이터에 이상적입니다. 간단한 API: getSharedPreferences(), edit(), putString(), apply()/commit().

## 2. SharedPreferences에 값을 저장하는 방법은 무엇입니까?

**답변**

인스턴스 가져오기: val prefs = context.getSharedPreferences('name', Context.MODE_PRIVATE). 편집: val editor = prefs.edit(); editor.putString('key', 'value'); editor.apply() (비동기) 또는 editor.commit() (동기). 체이닝도 가능: prefs.edit().putString('key', 'value').apply().

## 3. apply()와 commit()의 차이는 무엇입니까?

**답변**

apply()는 비동기적이며(백그라운드에서 쓰고 UI 스레드를 차단하지 않음), 아무것도 반환하지 않으며, 대부분의 경우 권장됩니다. commit()은 동기적이며(쓰기까지 차단), boolean을 반환하고(성공 시 true), 성공을 즉시 확인해야 하는 경우 유용합니다. apply()가 UI 성능에 더 좋습니다.

## 26개 추가 질문 이용 가능

- SharedPreferences에서 값을 읽는 방법은 무엇입니까?
- Jetpack DataStore란 무엇입니까?

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## 기타 Android 면접 주제

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- [Android Testing Advanced](https://sharpskill.dev/ko/technologies/android/interview-questions/android-testing-advanced.md): 18개 질문, Senior

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