android基础--使用Pull解析器生成XML文件

解析person.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<persons>
<person id="23">
<name>张三</name>
<age>3</age>
</person>
<person id="20">
<name>Mary</name>
<age>25</age>
</person>
</persons>

<uses-library android:name="android.test.runner" />

<instrumentation android:name="android.test.InstrumentationTestRunner"

android:targetPackage="cn.com.xml" android:label="Tests for My App" />

public class Person {
private String name;
private int id;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "Person [age=" + age + ", id=" + id + ", name=" + name + "]";
}

}

public static ArrayList<Person> getPersons(InputStream xml)
throws Exception {
ArrayList<Person> persons = null;
Person person = null;
XmlPullParser parser = Xml.newPullParser();
parser.setInput(xml, "utf-8");
int event = parser.getEventType();
while (event != XmlPullParser.END_DOCUMENT) {
switch (event) {
case XmlPullParser.START_DOCUMENT:
persons = new ArrayList<Person>();
break;
case XmlPullParser.START_TAG:
if ("person".equals(parser.getName())) {
person = new Person();
person.setId(Integer.parseInt(parser.getAttributeValue(0)));
} else if ("name".equals(parser.getName())) {
person.setName(parser.nextText());
} else if ("age".equals(parser.getName())) {
person.setAge(Integer.parseInt(parser.nextText()));
}
break;
case XmlPullParser.END_TAG:
if ("person".equals(parser.getName())) {
persons.add(person);
person = null;
}
default:
break;
}
event = parser.next();
}
return persons;
}

public void testGetPersons() throws Throwable{
InputStream xml = this.getClass().getClassLoader().getResourceAsStream("person.xml");
ArrayList<Person> al = PullXml.getPersons(xml);
for(Person person: al){
Log.i("PersonTest", person.toString());
}
}

集合xml的转换，将例子中类路径下的person.xml文件读取并存放到手机中应用程序的/data/data/应用程序包/files下

public static void savePersons(ArrayList<Person> persons, OutputStream out)throws Exception{
XmlSerializer xs = Xml.newSerializer();
xs.setOutput(out, "utf-8");
xs.startDocument("utf-8", true);
xs.startTag(null, "persons");
for(Person p : persons){
xs.startTag(null, "person");
xs.attribute(null, "id", p.getId()+"");

xs.startTag(null, "name");
xs.text(p.getName());
xs.endTag(null, "name");
xs.startTag(null, "age");
xs.text(p.getAge()+"");
xs.endTag(null, "age");
xs.endTag(null, "person");
}
xs.endTag(null, "persons");
xs.endDocument();
out.flush();
out.close();
}

public void testSavePersons() throws Throwable{
InputStream xml = this.getClass().getClassLoader().getResourceAsStream("person.xml");
ArrayList<Person> al = PullXml.getPersons(xml);
FileOutputStream out = new FileOutputStream(new File(getContext().getFilesDir(),"zzzz.xml"));
PullXml.savePersons(al, out);
}