* SharedPreference 정의
1. 저장
> SharedPreference 를 선언한다.
public final String PREFERENCE = "com.studio572.samplesharepreference";
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
// SharedPreferences 의 데이터를 저장/편집 하기위해 Editor 변수를 선언한다.
SharedPreferences.Editor editor = pref.edit();
// key값에 value값을 저장한다.
// String, boolean, int, float, long 값 모두 저장가능하다.
editor.putString(key, value);
// 메모리에 있는 데이터를 저장장치에 저장한다.
editor.commit();
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
첫번째 매개변수(PREFERENCE) : 저장/불러오기 하기 위한 key이다.
이 고유키로 앱의 할당된 저장소(data/data/[패키지 이름]/shared_prefs) 에 "com.studio572.samplesharepreference.xml" 로 저장된다.
이 때 xml 파일명은 사용자 정의가 가능하다.
> 두번째 매개변수(MODE_PRIVATE) : 프리퍼런스의 저장 모드를 정의한다.
[MODE_PRIVATE : 이 앱안에서 데이터 공유]
[MODE_WORLD_READABLE : 다른 앱과 데이터 읽기 공유]
[MODE_WORLD_WRITEABLE : 다른 앱과 데이터 쓰기 공유]
2. 불러오기
// SharedPreference 를 선언한다.
// 저장했을때와 같은 key로 xml에 접근한다.
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
// key에 해당한 value를 불러온다.
// 두번째 매개변수는 , key에 해당하는 value값이 없을 때에는 이 값으로 대체한다.
String result = pref.getString(key, "");
아래는 SharedPreference를 사용한 예제 소스.
특별한 코드는 없으니 한번 쓰윽 훑어보시면 될 듯 합니다.
위 유튜브 동영상의 구현 소스이다.
* MainActivity.java
package com.studio572.samplesharepreference;
import android.content.Context;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
public final String PREFERENCE = "com.studio572.samplesharepreference";
public final String key01 = "key01";
public final String key02 = "key02";
public final String key03 = "key03";
public final String key04 = "key04";
public final String key05 = "key05";
private boolean isBoolean;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TextView result = (TextView) findViewById(R.id.result);
final EditText inputString = (EditText) findViewById(R.id.edit01);
final Button inputBooleanTrue = (Button) findViewById(R.id.edit02_1);
final Button inputBooleanFalse = (Button) findViewById(R.id.edit02_2);
final EditText inputInt = (EditText) findViewById(R.id.edit03);
final EditText inputFlaot = (EditText) findViewById(R.id.edit04);
final EditText inputLong = (EditText) findViewById(R.id.edit05);
Button saveString = (Button) findViewById(R.id.save01);
Button saveBoolean = (Button) findViewById(R.id.save02);
Button saveInt = (Button) findViewById(R.id.save03);
Button saveFloat = (Button) findViewById(R.id.save04);
Button saveLong = (Button) findViewById(R.id.save05);
Button loadString = (Button) findViewById(R.id.load01);
Button loadBoolean = (Button) findViewById(R.id.load02);
Button loadInt = (Button) findViewById(R.id.load03);
Button loadFloat = (Button) findViewById(R.id.load04);
Button loadLong = (Button) findViewById(R.id.load05);
Button clear = (Button) findViewById(R.id.clear);
inputBooleanTrue.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
isBoolean = true;
}
});
inputBooleanFalse.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
isBoolean = false;
}
});
saveString.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
setPreference(key01, inputString.getText().toString());
}
});
saveBoolean.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
setPreference(key02, isBoolean);
}
});
saveInt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
setPreference(key03, Integer.parseInt(inputInt.getText().toString()));
}
});
saveFloat.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
setPreference(key04, Float.parseFloat(inputFlaot.getText().toString()));
}
});
saveLong.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
setPreference(key05, Long.parseLong(inputLong.getText().toString()));
}
});
loadString.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
result.setText("String: " + getPreferenceString(key01));
}
});
loadBoolean.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
result.setText("Boolean: " + getPreferenceBoolean(key02));
}
});
loadInt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
result.setText("Int: " + getPreferenceInt(key03));
}
});
loadFloat.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
result.setText("Float: " + getPreferenceFloat(key04));
}
});
loadLong.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
result.setText("Long: " + getPreferenceLong(key05));
}
});
clear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
setPreferenceClear();
}
});
}
// 데이터 저장 함수
public void setPreference(String key, boolean value){
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
SharedPreferences.Editor editor = pref.edit();
editor.putBoolean(key, value);
editor.commit();
}
public void setPreference(String key, String value){
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
SharedPreferences.Editor editor = pref.edit();
editor.putString(key, value);
editor.commit();
}
public void setPreference(String key, int value){
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
SharedPreferences.Editor editor = pref.edit();
editor.putInt(key, value);
editor.commit();
}
public void setPreference(String key, float value){
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
SharedPreferences.Editor editor = pref.edit();
editor.putFloat(key, value);
editor.commit();
}
public void setPreference(String key, long value){
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
SharedPreferences.Editor editor = pref.edit();
editor.putLong(key, value);
editor.commit();
}
// 데이터 불러오기 함수
public boolean getPreferenceBoolean(String key){
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
return pref.getBoolean(key, false);
}
public String getPreferenceString(String key){
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
return pref.getString(key, "");
}
public int getPreferenceInt(String key){
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
return pref.getInt(key, 0);
}
public float getPreferenceFloat(String key){
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
return pref.getFloat(key, 0f);
}
public long getPreferenceLong(String key){
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
return pref.getLong(key, 0l);
}
// 데이터 한개씩 삭제하는 함수
public void setPreferenceRemove(String key){
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
SharedPreferences.Editor editor = pref.edit();
editor.remove(key);
editor.commit();
}
// 모든 데이터 삭제
public void setPreferenceClear(){
SharedPreferences pref = getSharedPreferences(PREFERENCE, MODE_PRIVATE);
SharedPreferences.Editor editor = pref.edit();
editor.clear();
editor.commit();
}
}
위 동영상에 나오는 UI대로 레이아웃을 코딩한다.
단순 레이아웃이므로 설명은 생략한다.,
* activity_main,xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:orientation="horizontal"
android:background="#88ff0000">
<TextView
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_weight="1"
android:gravity="center"
android:paddingLeft="5dp"
android:text="결과 : "
android:textColor="#000000"/>
<TextView
android:id="@+id/result"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_weight="1"
android:paddingLeft="5dp"
android:gravity="center"
android:text=""
android:textColor="#000000"
android:background="#88cccccc"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:orientation="horizontal">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:paddingLeft="5dp"
android:text="입력변수 자료형"
android:textColor="#000000"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="데이터 입력"
android:textColor="#000000"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1.2"
android:gravity="center"
android:text="저장"
android:textColor="#000000"
android:background="#cccccc"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:layout_weight="1.2"
android:gravity="center"
android:text="불러오기"
android:textColor="#000000"
android:background="#cccccc"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:orientation="horizontal">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:paddingLeft="5dp"
android:text="String"
android:textColor="#000000"/>
<EditText
android:id="@+id/edit01"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textColor="#000000"/>
<Button
android:id="@+id/save01"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:layout_weight="1.2"
android:gravity="center"
android:text="저장"
android:textColor="#000000"
android:background="#cccccc"/>
<Button
android:id="@+id/load01"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:layout_weight="1.2"
android:gravity="center"
android:text="불러오기"
android:textColor="#000000"
android:background="#cccccc"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:orientation="horizontal">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:paddingLeft="5dp"
android:text="Boolean"
android:textColor="#000000"/>
<Button
android:id="@+id/edit02_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1.2"
android:text="ture"
android:textColor="#000000"/>
<Button
android:id="@+id/edit02_2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1.2"
android:text="false"
android:textColor="#000000"/>
<Button
android:id="@+id/save02"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1.2"
android:gravity="center"
android:text="저장"
android:textColor="#000000"
android:background="#cccccc"/>
<Button
android:id="@+id/load02"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:layout_weight="1.2"
android:gravity="center"
android:text="불러오기"
android:textColor="#000000"
android:background="#cccccc"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:orientation="horizontal">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:paddingLeft="5dp"
android:text="Int"
android:textColor="#000000"/>
<EditText
android:id="@+id/edit03"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number"
android:layout_weight="1"
android:textColor="#000000"/>
<Button
android:id="@+id/save03"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1.2"
android:text="저장"
android:textColor="#000000"
android:background="#cccccc"/>
<Button
android:id="@+id/load03"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:layout_weight="1.2"
android:gravity="center"
android:text="불러오기"
android:textColor="#000000"
android:background="#cccccc"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:orientation="horizontal">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:paddingLeft="5dp"
android:text="Float"
android:textColor="#000000"/>
<EditText
android:id="@+id/edit04"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number"
android:layout_weight="1"
android:textColor="#000000"/>
<Button
android:id="@+id/save04"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1.2"
android:gravity="center"
android:text="저장"
android:textColor="#000000"
android:background="#cccccc"/>
<Button
android:id="@+id/load04"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:layout_weight="1.2"
android:gravity="center"
android:text="불러오기"
android:textColor="#000000"
android:background="#cccccc"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:orientation="horizontal">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:paddingLeft="5dp"
android:text="Long"
android:textColor="#000000"/>
<EditText
android:id="@+id/edit05"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number"
android:layout_weight="1"
android:textColor="#000000"/>
<Button
android:id="@+id/save05"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1.2"
android:gravity="center"
android:text="저장"
android:textColor="#000000"
android:background="#cccccc"/>
<Button
android:id="@+id/load05"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:layout_weight="1.2"
android:gravity="center"
android:text="불러오기"
android:textColor="#000000"
android:background="#cccccc"/>
</LinearLayout>
<Button
android:id="@+id/clear"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_weight="0"
android:gravity="center"
android:text="clear"
android:textColor="#000000"
android:background="#cccccc"/>
</LinearLayout>
