一、简单的数据存储方式，用来保存账号、密码等信息

二、用来保存多键值对象的id 等信息，如果我要获取一组自定义的存储对象，我可以先将它的id先保存下来

三、对象类型的数据存储 一般用于自动登录、浏览历史等

下面是工具类，serviceinfo对象是网络获取的信息对象，我会存储并以查看时间的毫秒为对象的saveTime值

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.StreamCorruptedException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.codec.binary.Base64;

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

import com.maq.api.ServiceInfo;
import com.maq.api.ServiceInfoComparator;
import com.maq.app.EdjApp;
public class SharedPreTools {

//单键值存储----------------------------
public static String readShare(String sharename,String key) {
SharedPreferences user = EdjApp.getInstance().getSharedPreferences(sharename,0);
return user.getString(key, "");
}

public static void writeShare(String sharename,String key,String value ) {
SharedPreferences user = EdjApp.getInstance().getSharedPreferences(sharename, 0);
Editor editor = user.edit();
editor.putString(key, value);
editor.commit();
}

public static void removeShare(String sharename,String key ) {
SharedPreferences user = EdjApp.getInstance().getSharedPreferences(sharename, 0);
Editor editor = user.edit();
editor.remove(key);
editor.commit();
}


//多键值存储
public static void writegroup(String sharename,String key,String value) {
SharedPreferences call = EdjApp.getInstance().getSharedPreferences(sharename, 0);
String group = call.getString(key, "");
if (group.indexOf(value) < 0) {
String newgroup = group + "," + key;
Editor editor = call.edit();
editor.putString(key, newgroup);
editor.commit();
}
}