将对象存储到SharedPreferences里

package com.bestours.youlun.utils;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.text.TextUtils;
import android.util.Log;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

/**
* Created by sunny on 16/4/7.
*/
public class SPUtil {

/**
* 从起启动应用，保存的搜索条件清空
*
* @param mContext
*/
public static void initOption(Activity mContext) {
SPUtil.saveObject(mContext, "destinationShow", null);
SPUtil.saveObject(mContext, "companyShow", null);
SPUtil.saveObject(mContext, "nightShow", null);
SPUtil.saveObject(mContext, "dayShow", null);

}

/**
* desc:获取保存的Object对象
*
* @param context
* @param key
* @return modified:
*/
public static Object readObject(Context context, String key) {
Object readObject = null;
try {
SharedPreferences sharedata = context.getSharedPreferences("config", 0);
if (sharedata.contains(key)) {
String string = sharedata.getString(key, "");
if (TextUtils.isEmpty(string)) {
readObject = null;
} else {
//将16进制的数据转为数组，准备反序列化
byte[] stringToBytes = StringToBytes(string);
ByteArrayInputStream bis = new ByteArrayInputStream(stringToBytes);
ObjectInputStream is = new ObjectInputStream(bis);
//返回反序列化得到的对象
readObject = is.readObject();
}
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
readObject = null;

}
//所有异常返回null
return readObject;

}

/**
* desc:将16进制的数据转为数组
* <p>创建人：聂旭阳 , 2014-5-25 上午11:08:33</p>
*
* @param data
* @return modified:
*/
public static byte[] StringToBytes(String data) {
String hexString = data.toUpperCase().trim();
if (hexString.length() % 2 != 0) {
return null;
}
byte[] retData = new byte[hexString.length() / 2];
for (int i = 0; i < hexString.length(); i++) {
int int_ch;  // 两位16进制数转化后的10进制数
char hex_char1 = hexString.charAt(i); ////两位16进制数中的第一位(高位*16)
int int_ch1;
if (hex_char1 >= '0' && hex_char1 <= '9')
int_ch1 = (hex_char1 - 48) * 16;   //// 0 的Ascll - 48
else if (hex_char1 >= 'A' && hex_char1 <= 'F')
int_ch1 = (hex_char1 - 55) * 16; //// A 的Ascll - 65
else
return null;
i++;
char hex_char2 = hexString.charAt(i); ///两位16进制数中的第二位(低位)
int int_ch2;
if (hex_char2 >= '0' && hex_char2 <= '9')
int_ch2 = (hex_char2 - 48); //// 0 的Ascll - 48
else if (hex_char2 >= 'A' && hex_char2 <= 'F')
int_ch2 = hex_char2 - 55; //// A 的Ascll - 65
else
return null;
int_ch = int_ch1 + int_ch2;
retData[i / 2] = (byte) int_ch;//将转化后的数放入Byte里
}
return retData;
}

/**
* desc:保存对象
*
* @param context
* @param key
* @param obj     要保存的对象，只能保存实现了serializable的对象
*                modified:
*/
public static void saveObject(Context context, String key, Object obj) {
try {
// 保存对象
SharedPreferences.Editor sharedata = context.getSharedPreferences("config", 0).edit();
//先将序列化结果写到byte缓存中，其实就分配一个内存空间
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream os = new ObjectOutputStream(bos);
//将对象序列化写入byte缓存
os.writeObject(obj);
//将序列化的数据转为16进制保存
String bytesToHexString = bytesToHexString(bos.toByteArray());
//保存该16进制数组
sharedata.putString(key, bytesToHexString);
sharedata.commit();
} catch (IOException e) {
e.printStackTrace();
Log.e("", "保存obj失败");
}
}

/**
* desc:将数组转为16进制
*
* @param bArray
* @return modified:
*/
public static String bytesToHexString(byte[] bArray) {
if (bArray == null) {
return null;
}
if (bArray.length == 0) {
return "";
}
StringBuffer sb = new StringBuffer(bArray.length);
String sTemp;
for (int i = 0; i < bArray.length; i++) {
sTemp = Integer.toHexString(0xFF & bArray[i]);
if (sTemp.length() < 2)
sb.append(0);
sb.append(sTemp.toUpperCase());
}
return sb.toString();
}
}