PRivate void createXmlFile(){  
          
        try {  
            DocumentBuilderFactory factory = DocumentBuilderFactory  
                    .newInstance();  
            DocumentBuilder builder = factory.newDocumentBuilder();  
            Document doc  = builder.newDocument();  
            //创建xml根元素  
            Element rootEle = doc.createElement("classes");  
            doc.appendChild(rootEle);  
            //创建xml二级元素  
            Element groupEle = doc.createElement("group");  
            groupEle.setattribute("name", "一年级");  
            groupEle.setAttribute("num", "10");  
            //创建xml person元素  
            Element personEle = doc.createElement("person");  
            //personEle 的属性和属性值  
            personEle.setAttribute("name", "小明");  
            personEle.setAttribute("age", "7");  
            //创建personELe的子元素  
            Element chinese = doc.createElement("chinese");  
            //创建personELe的子元素的值  
            chinese.appendChild(doc.createTextNode("语文90"));  
            personEle.appendChild(chinese);  
            Element english = doc.createElement("english");  
            english.appendChild(doc.createTextNode("英语80"));  
            personEle.appendChild(english);  
              
            groupEle.appendChild(personEle);  
            rootEle.appendChild(groupEle);  
              
            TransformerFactory tf = TransformerFactory.newInstance();  
            Transformer transformer = tf.newTransformer();  
              
            DOMSource source = new DOMSource(doc);  
            transformer.setOutputProperty(OutputKeys.ENCODING, "utf-8");  
            transformer.setOutputProperty(OutputKeys.INDENT, "no");  
            //创建文件存放在 /data/data/cn.xxx.xxx(当前包)/files   
            FileOutputStream fos = openFileOutput("Dom.xml", Context.MODE_PRIVATE);  
            //创建文件存放在 /data/data/cn.xxx.xxx(当前包)/cache  
//          FileOutputStream fos = Op  
            PrintWrITer pw = new PrintWriter(fos);  
            StreamResult result = new StreamResult(pw);  
            transformer.transform(source, result);  
              
            System.out.println("生成xml文件成功!");  
        } catch (ParserconfigurationException e) {  
            System.out.println(e.getMessage());  
        } catch (TransformerConfigurationException e) {  
            System.out.println(e.getMessage());  
        } catch (TransformerException e) {  
            System.out.println(e.getMessage());  
        } catch (FileNotFoundException e) {  
            System.out.println(e.getMessage());  
        }  
          
    }