复制代码代码如下:
public void backSms(View view){
  //假设我已经获取到了所有的短信
  StringBuilder sb = new StringBuilder();
  sb.append("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
  sb.append("<smss>");
  for(SmsInfo info:smsInfos){
   sb.append("<sms>");

   sb.append("<address>");
   sb.append(info.getAddress());
   sb.append("</address>");


   sb.append("<type>");
   sb.append(info.getType());
   sb.append("</type>");

   sb.append("<body>");
   sb.append(info.getBody());
   sb.append("</body>");

   sb.append("<date>");
   sb.append(info.getBody());
   sb.append("</date>");

   sb.append("</sms>");
  }
  sb.append("</smss>");
  try{
   File file = new File(Environment.getExternalStorageDirectory(),"backup.xml");
   FileOutputStream fos = new FileOutputStream(file);
   fos.write(sb.toString().getBytes());
   Toast.makeText(this, "备份成功", Toast.LENGTH_LONG).show();
  }catch(Exception e){
   e.printStackTrace();
   Toast.makeText(this, "备份失败", Toast.LENGTH_LONG).show();
  }

}

采用XmlSerializer实现的方式：
复制代码代码如下:
public void backSms2(View view){
  try{
   XmlSerializer serializer = Xml.newSerializer();
   File file = new File(Environment.getExternalStorageDirectory(),"backup2.xml");
   FileOutputStream os = new FileOutputStream(file);
   //初始化序列号器指定XML数据写入到哪个文件并且指定文件的编码方式
   serializer.setOutput(os,"utf-8");
   serializer.startDocument("uft-8", true);
   serializer.startTag(null, "smss");
   for(SmsInfo info:smsInfos){
    serializer.startTag(null, "sms");
    serializer.attribute(null, "id", info.getId()+"");

    serializer.startTag(null, "body");
    serializer.text(info.getBody());
    serializer.endTag(null, "body");

    serializer.startTag(null, "address");
    serializer.text(info.getAddress());
    serializer.endTag(null, "address");

    serializer.endTag(null, "sms");
   }

   serializer.endTag(null, "smss");
   serializer.endDocument();
  }catch(Exception e){
   e.printStackTrace();
   Toast.makeText(this, "备份失败", 0);
  }

}

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