Preference Example
SharedPreference 기본 선언 형태는 다음과 같다.
SharedPreferences pref = getSharedPreferences("isTrue", MainActivity.MODE_PRIVATE); SharedPreferences.Editor editor = pref.edit(); |
MODE_PRIVATE는 파일 생성 모드이며 기본값이다. 해당 파일은 호출한 앱에서만 접근이 가능하다.
pref.getBoolean("isTrue", false); |
저장된 데이터를 가져오는 방법.
editor.putBoolean("isTrue", true); editor.commit(); |
데이터를 저장하는 방법.
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.preferenceexam.mystoryg.preferenceexam.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Do you want to learn preference?" />
<CheckBox
android:id="@+id/check1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/check_true" />
<CheckBox
android:id="@+id/check2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/check_false" />
</LinearLayout> |
MainActivity.java
package com.preferenceexam.mystoryg.preferenceexam;
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.Checkable;
public class MainActivity extends Activity {
CheckBox checkTrue;
CheckBox checkFalse;
SharedPreferences pref;
SharedPreferences.Editor editor;
boolean isTrue;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
checkTrue = (CheckBox) findViewById(R.id.check1);
checkFalse = (CheckBox) findViewById(R.id.check2);
pref = getSharedPreferences("isTrue", MainActivity.MODE_PRIVATE);
editor = pref.edit();
isTrue = pref.getBoolean("isTrue", false);
if (isTrue) {
checkTrue.setChecked(true);
checkFalse.setChecked(false);
} else {
checkTrue.setChecked(false);
checkFalse.setChecked(true);
}
checkTrue.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checkTrue.setChecked(true);
checkFalse.setChecked(false);
editor.putBoolean("isTrue", true);
editor.commit();
}
});
checkFalse.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checkTrue.setChecked(false);
checkFalse.setChecked(true);
editor.putBoolean("isTrue", false);
editor.commit();
}
});
}
} |
