안드로이드에서 Java Singleton 패턴으로 SharedPreferences 처리를 하는 코드를 적어둔다.
import android.content.Context;
import android.content.SharedPreferences;
public class PrefsHelper {
private static Context mContext;
private static SharedPreferences prefs;
private static SharedPreferences.Editor editor;
private static PrefsHelper prefmodule = null;
public static final String PREF_NAME ="pref";
public static final String BaudRate = "BaudRate";
public static final String DataBit = "DataBit";
public static final String StopBit = "StopBit";
public static final String Parity ="Parity";
public static PrefsHelper getInstance(Context context) {
mContext = context;
if (prefmodule == null) {
prefmodule = new PrefsHelper();
}
if(prefs==null){
prefs = mContext.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE);
editor = prefs.edit();
}
return prefmodule;
}
public static String read(String key, String defValue) {
return prefs.getString(key, defValue);
}
public static void write(String key, String value) {
SharedPreferences.Editor prefsEditor = prefs.edit();
prefsEditor.putString(key, value);
prefsEditor.commit();
}
public static boolean read(String key, boolean defValue) {
return prefs.getBoolean(key, defValue);
}
public static void write(String key, boolean value) {
SharedPreferences.Editor prefsEditor = prefs.edit();
prefsEditor.putBoolean(key, value);
prefsEditor.commit();
}
public static Integer read(String key, int defValue) {
return prefs.getInt(key, defValue);
}
public static void write(String key, Integer value) {
SharedPreferences.Editor prefsEditor = prefs.edit();
prefsEditor.putInt(key, value).commit();
}
}
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사용법 write
private void writePreferences(String baudRate, String dataBit, String stopBit, int parity){
PrefsHelper.getInstance(this).write(PrefsHelper.BaudRate, baudRate);
PrefsHelper.getInstance(this).write(PrefsHelper.DataBit, dataBit);
PrefsHelper.getInstance(this).write(PrefsHelper.StopBit, stopBit);
PrefsHelper.getInstance(this).write(PrefsHelper.Parity, String.valueOf(parity));
}
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읽기
String BaudRate = PrefsHelper.getInstance(mContext).read(PrefsHelper.BaudRate,null);
String DataBit = PrefsHelper.getInstance(mContext).read(PrefsHelper.DataBit,null);
String StopBit = PrefsHelper.getInstance(mContext).read(PrefsHelper.StopBit,null);
String Parity = PrefsHelper.getInstance(mContext).read(PrefsHelper.Parity,null);
다른 예제
이 예제를 활용하면 여러모로 편하다.
import android.content.Context;
import android.content.SharedPreferences;
public class PrefsHelper {
public static final String PREFERENCE_NAME="pref";
private Context mContext;
private static SharedPreferences prefs;
private static SharedPreferences.Editor prefsEditor;
private static PrefsHelper instance;
public static synchronized PrefsHelper init(Context context){
if(instance == null)
instance = new PrefsHelper(context);
return instance;
}
private PrefsHelper(Context context) {
mContext = context;
prefs = mContext.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE );
prefsEditor = prefs.edit();
}
public static String read(String key, String defValue) {
return prefs.getString(key, defValue);
}
public static void write(String key, String value) {
prefsEditor.putString(key, value);
prefsEditor.commit();
}
public static Integer read(String key, int defValue) {
return prefs.getInt(key, defValue);
}
public static void write(String key, Integer value) {
prefsEditor.putInt(key, value).commit();
}
public static boolean read(String key, boolean defValue) {
return prefs.getBoolean(key, defValue);
}
public static void write(String key, boolean value) {
prefsEditor.putBoolean(key, value);
prefsEditor.commit();
}
}
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사용방법
PrefsHelper.init(getApplicationContext()); // 한번만 실행하면 된다.
// 쓰기
PrefsHelper.write("userid",userID);
PrefsHelper.write("userpw",userPW);
// 읽기
userID = PrefsHelper.read("userid","");
userPW = PrefsHelper.read("userpw","");
