XML的序列化（Serializer）

步骤：

//1获取XmlSerializer 类的实例  通过Xml这个工具类去获取
    XmlSerializer xmlSerializer = Xml.newSerializer();
    try {
        //2.设置 xmlserializer序列化器参数
        File file = new File(Environment.getExternalStorageDirectory().getPath(), "smsInfo.xml");
        FileOutputStream fos = new FileOutputStream(file);
        xmlSerializer.setOutput(fos, "utf-8");
    //3开始写xml文档开头，结尾也写上
        xmlSerializer.startDocument("utf-8",true);
        //4.写xml的根节点开头 就是namespace命名空间 结尾也要一起写
        xmlSerializer.startTag(null,"smss");
        //5.循环来写sms节点
        for (SMS sms:smsLists) {
            //6正式开始写内容 adddress节点
            xmlSerializer.startTag(null,"address");
            xmlSerializer.text(sms.getAddress());
            xmlSerializer.endTag(null,"address");
            //7正式开始写内容 body节点
            xmlSerializer.startTag(null,"body");
            xmlSerializer.text(sms.getBody());
            xmlSerializer.endTag(null,"body");
            //8正式开始写内容 date节点
            xmlSerializer.startTag(null,"date");
            xmlSerializer.text(sms.getDate());
            xmlSerializer.endTag(null,"date");

        }
        xmlSerializer.endTag(null,"smss");
        //文档结尾
        xmlSerializer.endDocument();
        //关闭流
        fos.close();

    } catch (Exception e) {
        e.printStackTrace();
    }

}