Android里利用XmlSerializer生成xml文件

private static void XmlFileCreator(List<JokeBean> data){
        File newxmlfile = new File(Environment.getExternalStorageDirectory()+"/new.xml");
        try{
            if(!newxmlfile.exists())
                newxmlfile.createNewFile();
        }catch(IOException e){
            Log.e("IOException", "exception in createNewFile() method");
        }
        //we have to bind the new file with a FileOutputStream
        FileOutputStream fileos = null;        
        try{
            fileos = new FileOutputStream(newxmlfile);
        }catch(FileNotFoundException e){
            Log.e("FileNotFoundException", "can't create FileOutputStream");
        }
        //we create a XmlSerializer in order to write xml data
        XmlSerializer serializer = Xml.newSerializer();
        try {
            //we set the FileOutputStream as output for the serializer, using UTF-8 encoding
            serializer.setOutput(fileos, "UTF-8");
            //Write <?xml declaration with encoding (if encoding not null) and standalone flag (if standalone not null)
            serializer.startDocument(null, Boolean.valueOf(true));
            //set indentation option
            serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
          //start a tag called "root"
            serializer.startTag(null, "jokes");
            for(JokeBean joke:data){
                serializer.startTag(null, "joke");
                //i indent code just to have a view similar to xml-tree
                serializer.startTag(null, "id");
                serializer.text(joke.getId());
                serializer.endTag(null, "id");
                                   
                serializer.startTag(null, "title");
                serializer.text(joke.getTitle());
                //set an attribute called "attribute" with a "value" for <child2>
                //serializer.attribute(null, "attribute", "value");
                serializer.endTag(null, "title");
                serializer.startTag(null, "text");
                //write some text inside <text>
                serializer.text(joke.getText());
                serializer.endTag(null, "text");
                                   
                serializer.endTag(null, "joke");
            }
            serializer.endTag(null, "jokes");
            serializer.endDocument();
            //write xml data into the FileOutputStream
            serializer.flush();
            //finally we close the file stream
            fileos.close();
        } catch (Exception e) {
            Log.e("Exception","error occurred while creating xml file");
        }
    }