private String body;
private String number;
private int type;
private long id;

public static void backUpXml(File file, List<XmlInfo> smsInfos) throws Exception{//xml文件的序列号器  帮助生成一个xml文件FileOutputStream fos = new FileOutputStream(file);//获取到xml的序列号XmlSerializer serializer = Xml.newSerializer();//序列化初始化serializer.setOutput(fos, "utf-8");//创建xmlserializer.startDocument("utf-8", true);serializer.startTag(null, "smss");for(XmlInfo info : smsInfos){serializer.startTag(null, "sms");serializer.attribute(null, "id", String.valueOf(info.getId()));serializer.startTag(null, "body");serializer.attribute(null, "body", info.getBody());serializer.endTag(null, "body");serializer.startTag(null, "number");serializer.text(info.getNumber());serializer.endTag(null, "number");serializer.endTag(null, "sms");}serializer.endTag(null, "smss");serializer.endDocument();fos.flush();fos.close();}

List<XmlInfo> xmlinfo = new ArrayList<XmlInfo>();XmlInfo xml1 = new XmlInfo("aaaa","12345678912",1,1);XmlInfo xml2 = new XmlInfo("bbbb","21987654321",1,2);XmlInfo xml3 = new XmlInfo("cccc","12345678912",1,3);xmlinfo.add(xml1);xmlinfo.add(xml2);xmlinfo.add(xml3);File file = new File(Environment.getExternalStorageDirectory(),"back.xml");//File file = new File(MainActivity.this.getFilesDir(),"back.xml");try {XmlManager.backUpXml(file, xmlinfo);Toast.makeText(this, "备份成功", 0).show();} catch (Exception e) {// TODO 自动生成的 catch 块
            e.printStackTrace();Toast.makeText(this, "备份失败", 0).show();}