pull生成xml

布局文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" ><Button         android:id="@+id/btn_pull"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="读取"/> <Button        android:id="@+id/btn_cpull"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/btn_pull"        android:layout_alignParentRight="true"        android:layout_below="@+id/btn_pull"        android:layout_marginTop="28dp"        android:text="生成" /></RelativeLayout>

定义一个Person实体类：

private Integer id;private String name;private Short age;

 编写一个工具类：

public class PullXmlService {public Person currentPerson;// 声明返回值public List<Person> readXML(InputStream is) {List<Person> persons = null;// 首先利用XML.newPullParser()获取解析对象XmlPullParser xmlPullParser = Xml.newPullParser();try {// 解析文件xmlPullParser.setInput(is, "UTF-8");// 获取解析的事件类型int eventType = xmlPullParser.getEventType();// 判断文件解析的是否完毕while (eventType != XmlPullParser.END_DOCUMENT) {switch (eventType) {case XmlPullParser.START_DOCUMENT:persons = new ArrayList<Person>();break;case XmlPullParser.START_TAG:String tagName = xmlPullParser.getName();Log.v("PullXmlService", tagName + "------");// 当解析的标签是person时if ("person".equals(tagName)) {// 创建person对象currentPerson = new Person();// 设置id属性 需要进行转化currentPerson.setId(Integer.parseInt(xmlPullParser.getAttributeValue(null, "id")));} else if ("name".equals(tagName)) {currentPerson.setName(xmlPullParser.nextText());} else if ("age".equals(tagName)) {currentPerson.setAge(new Short(xmlPullParser.nextText()));}break;case XmlPullParser.END_TAG:if ("person".equals(xmlPullParser.getName()) && currentPerson != null) {// 把person对象添加到集合中persons.add(currentPerson);currentPerson = null;}break;}// 下一个标签标识eventType = xmlPullParser.next();}// 关闭流is.close();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}// 返回return persons;}/** * 采用pull生成XML文件 *  * @param persons * @return */public boolean write(List<Person> persons) {// 采用pull解析进行实现if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {File sdCardDir = Environment.getExternalStorageDirectory();File file = new File(sdCardDir, "mycsdn.xml");Log.e("保存的路径是", sdCardDir+"/mysdk");XmlSerializer serializer = Xml.newSerializer();FileOutputStream fos = null;try {// 根据文件对象创建一个文件的输出流对象fos = new FileOutputStream(file);// 设置输出的流及编码serializer.setOutput(fos, "UTF-8");// 设置文件的开始serializer.startDocument("UTF-8", true);// persons标签开始serializer.startTag(null, "persons");for (Person person : persons) {serializer.startTag(null, "person");serializer.attribute("null", "id", person.getId() + "");// 设置person标签的子标签 nameserializer.startTag(null, "name");serializer.text(person.getName());serializer.endTag(null, "name");// 设置person标签的子标签的ageserializer.startTag(null, "age");serializer.text(person.getAge() + "");serializer.endTag(null, "age");// person标签的结束serializer.endTag(null, "person");}serializer.endTag(null, "persons");serializer.endDocument();fos.flush();fos.close();return true;} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}return false;}}

主类：

public class MainActivity extends Activity {// pull解析器业务对象public PullXmlService pullXmlService;public Button btn_pull, btn_cpull;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// 设置显示的视图setContentView(R.layout.activity_main);pullXmlService = new PullXmlService();// 首先获取按钮组件对象btn_pull = (Button) findViewById(R.id.btn_pull);btn_cpull = (Button) findViewById(R.id.btn_cpull);// 注册事件btn_pull.setOnClickListener(new MyOnClickListener());btn_cpull.setOnClickListener(new MyOnClickListener());}class MyOnClickListener implements View.OnClickListener {@Overridepublic void onClick(View v) {int id = v.getId();switch (id) {case R.id.btn_pull:List<Person> persons = null;try {persons = pullXmlService.readXML(getAssets().open("csdn.xml"));} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}if (persons != null) {Toast.makeText(MainActivity.this,"采用pull解析xml文件" + persons.get(0).getName() + "--" + persons.get(1).getName(),Toast.LENGTH_LONG).show();}break;case R.id.btn_cpull:try {List<Person> persons1 = pullXmlService.readXML(getAssets().open("csdn.xml"));// 重新生成一个xml文件 mycsdn.xmlboolean flag = pullXmlService.write(persons1);if (flag) {Toast.makeText(MainActivity.this, "采用pull解析生产xml文件成功", Toast.LENGTH_LONG).show();} else {Toast.makeText(MainActivity.this, "采用pull解析生产xml文件失败", Toast.LENGTH_LONG).show();}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}break;default:break;}}}}

运行的结果如下（mnt/shell/emulated/0目录下有这个文件）：