프리퍼런스 사용하기

package com.example.nmg.pref;

import android.content.Context;
import android.content.SharedPreferences;

public class PreferenceUtil {

    public static final String PREFERENCE_NAME = "wantName";
    private static PreferenceUtil preferencemodule = null;
    private static Context mContext;
    private static SharedPreferences prefs;
    private static SharedPreferences.Editor editor;

    public static PreferenceUtil getInstance(Context context) {
        mContext = context;

        if (preferencemodule == null) {
            preferencemodule = new PreferenceUtil();
        }
        if(prefs==null){
            prefs = mContext.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
            editor = prefs.edit();
        }
        return preferencemodule;
    }


    private int save(String key, int value) {
    editor.putInt(key, value);
    editor.commit();
    return value;
}

private String save(String key, String value) {
    editor.putString(key, value);
    editor.commit();
    return value;
}

private long save(String key, long value) {
    editor.putLong(key, value);
    editor.commit();
    return value;
}

private boolean save(String key, boolean value) {
    editor.putBoolean(key, value);
    editor.commit();
    return value;
}
    public String getId()                    { return prefs.getString("wantKey","default value"); }
    public String setId(String 변수명)       { return                save("wantKey", 변수명); }
    
}

이렇게 하고

갖다 쓸땐

PreferenceUtil.getInstance(mContext).setId(editText.getText().toString());
String a = PreferenceUtil.getInstance(mContext).getId();

하면 깔끔하게 사용 가능