SharedPreferences保存和读取对象

1.首先要序列化对象(以下是序列化实体类的样例，不方便贴出实体类全部的代码)

public class LoginResult extends BaseResult implements Serializable{private static final long serialVersionUID = 1L;private String mobiletoken;

2.保存和读取对象的封装

public class ObjectSaveUtil {private final static String FILENAME = "login_data_save";private final static String KEY = "loginResult";/*** desc:保存对象     * @param context* @param key * @param obj 要保存的对象，仅仅能保存实现了serializable的对象* modified:  */public static void saveObject(Context context,Object obj){try {// 保存对象SharedPreferences.Editor sharedata = context.getSharedPreferences(FILENAME, 0).edit();//先将序列化结果写到byte缓存中，事实上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();}/*** desc:获取保存的Object对象* @param context* @param key* @return* modified:   */public static Object readObject(Context context){try {SharedPreferences sharedata = context.getSharedPreferences(FILENAME, 0);if (sharedata.contains(KEY)) {String string = sharedata.getString(KEY, "");if(TextUtils.isEmpty(string)){return 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Object readObject = is.readObject();return readObject;}}} catch (StreamCorruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}//全部异常返回nullreturn null;}/*** 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_ch3;if(hex_char1 >= '0' && hex_char1 <='9')int_ch3 = (hex_char1-48)*16;    0 的Ascll - 48else if(hex_char1 >= 'A' && hex_char1 <='F')int_ch3 = (hex_char1-55)*16;  A 的Ascll - 65elsereturn null;i++;char hex_char2 = hexString.charAt(i); ///两位16进制数中的第二位(低位)int int_ch4;if(hex_char2 >= '0' && hex_char2 <='9')int_ch4 = (hex_char2-48);  0 的Ascll - 48else if(hex_char2 >= 'A' && hex_char2 <='F')int_ch4 = hex_char2-55;  A 的Ascll - 65elsereturn null;int_ch = int_ch3+int_ch4;retData[i/2]=(byte) int_ch;//将转化后的数放入Byte里}return retData;}}

挺好用的，欢迎大家复制使用