Android(安卓)用户偏好设置，SharedPreference

用户偏好设置是android应用中使用最频繁的本地数据存储方式。
比如自动登录，使用引导，记住账号，记住密码，应用设置等等。
SharedPreferences使用是十分简单的
1. 获取SharedPreferences

private String SHARED_PREFERENCES_NAME = "USER";SharedPreferences sp_user = context.getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE);

SHARED_PREFERENCES_NAME 是存储的名字，可以理解为本地存储文件名，其实质是*.xml文件，
是默认私有常量值，标示此文件是否共享，
如果SHARED_PREFERENCES_NAME 不存在，系统会自动创建

2. 写入数据

public boolean setLocalUser(User user){    if(user == null)    return true;    try{    SharedPreferences.Editor editor = sp_user.edit();        editor.putString(USER_NAME, user.getName());        editor.putString(USER_PHONE, user.getPhone());        editor.putString(ORGANISATION, user.getOrganisation());        editor.putString(EMAIL, user.getEmail());        editor.putString(ADDRESS, user.getAddress());        editor.putString(WEBSITE, user.getWebsite());        editor.putString(USER_IM, user.getIm());        editor.putString(NICKNAME, user.getNickname());                editor.commit();    }catch(Exception exception){    return true;    }        return false;    }

SharedPreferences.Editor editor = sp_user.edit();
以上是案例，把一个联系人名片存到SharedPreferences 中。

3. 使用

public User getLocalUser(){        User user = new User();        user.setName(sp_user.getString(USER_NAME, ""));    user.setPhone(sp_user.getString(USER_PHONE, ""));//     user.setState(sp_user.getString(USER_STATE, ""));    user.setOrganisation(sp_user.getString(ORGANISATION, ""));    user.setEmail(sp_user.getString(EMAIL, ""));    user.setAddress(sp_user.getString(ADDRESS, ""));    user.setWebsite(sp_user.getString(WEBSITE, ""));    user.setIm(sp_user.getString(USER_IM, ""));    user.setNickname(sp_user.getString(NICKNAME, ""));        if(user.getPhone().equals("")){    user.setPhone(Utils.getSimPhone());    }        return user;    }

其中 user.setName(sp_user.getString(USER_NAME, "")); 第一个参数是存储时的变量名，第二个参数是默认值，是在获取失败之后返回的值。

下面是本人项目中的一个SharedPreferenceManager.class，供大家参考，
其中有两个SharedPreferences 文件，管理本应用的用户偏好设置。
代码：

package com.gopain.TYT.util;import com.gopain.TYT.beans.User;import android.content.Context;import android.content.SharedPreferences;public class PreferencesManager {    public static final String SHARED_PREFERENCES_NAME = "SWIPE_LIST_VIEW_SAMPLE_PREFERENCES";        public static final String USER_NAME = "USER_NAME";    public static final String USER_PHONE = "USER_PHONE";    public static final String USER_STATE = "USER_STATE";    public static final String ORGANISATION = "ORGANISATION";    public static final String EMAIL = "EMAIL";    public static final String ADDRESS = "ADDRESS";    public static final String WEBSITE = "WEBSITE";    public static final String USER_IM = "USER_IM";    public static final String NICKNAME = "NICKNAME";    /**     * Instance     */    private static PreferencesManager preferencesManager = null;//    private static PreferencesManager preferences_user = null;    /**     * Shared Preferences     */    private SharedPreferences sharedPreferences;    private SharedPreferences sp_user;    /**     * Preferences variables     */    private static final String SHARED_PREFERENCES_SHOW_ABOUT = "SHARED_PREFERENCES_SHOW_ABOUT";    private static final String SHARED_PREFERENCES_LOCAL_USERINFO = "LOCAL_USERINFO";    /**     * Constructor     *     * @param context     */    private PreferencesManager(Context context) {        sharedPreferences = context.getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE);        sp_user = context.getSharedPreferences(SHARED_PREFERENCES_LOCAL_USERINFO, Context.MODE_PRIVATE);    }    public static PreferencesManager getInstance(Context context) {        if (preferencesManager == null) {            preferencesManager = new PreferencesManager(context);        }        return preferencesManager;    }//    public static PreferencesManager getEntity(Context context) {//        if (preferences_user == null) {//        preferences_user = context.getSharedPreferences(SHARED_PREFERENCES_LOCAL_USERINFO, Context.MODE_PRIVATE);//        }//        return preferences_user;//    }        public void setShowAbout(boolean showAbout) {        SharedPreferences.Editor editor = sharedPreferences.edit();        editor.putBoolean(SHARED_PREFERENCES_SHOW_ABOUT, showAbout);        editor.commit();    }    public boolean getShowAbout() {        return sharedPreferences.getBoolean(SHARED_PREFERENCES_SHOW_ABOUT, true);    }        public boolean setLocalUser(User user){    if(user == null)    return true;    try{    SharedPreferences.Editor editor = sp_user.edit();        editor.putString(USER_NAME, user.getName());        editor.putString(USER_PHONE, user.getPhone());        editor.putString(ORGANISATION, user.getOrganisation());        editor.putString(EMAIL, user.getEmail());        editor.putString(ADDRESS, user.getAddress());        editor.putString(WEBSITE, user.getWebsite());        editor.putString(USER_IM, user.getIm());        editor.putString(NICKNAME, user.getNickname());                editor.commit();    }catch(Exception exception){    return true;    }        return false;    }        public User getLocalUser(){        User user = new User();        user.setName(sp_user.getString(USER_NAME, ""));    user.setPhone(sp_user.getString(USER_PHONE, ""));//    user.setState(sp_user.getString(USER_STATE, ""));    user.setOrganisation(sp_user.getString(ORGANISATION, ""));    user.setEmail(sp_user.getString(EMAIL, ""));    user.setAddress(sp_user.getString(ADDRESS, ""));    user.setWebsite(sp_user.getString(WEBSITE, ""));    user.setIm(sp_user.getString(USER_IM, ""));    user.setNickname(sp_user.getString(NICKNAME, ""));        if(user.getPhone().equals("")){    user.setPhone(Utils.getSimPhone());    }        return user;    }}

我的目的是把一个用户的名片信息存到本地，

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