Android内置了PULL解析器的XPP3实现，以及SAX解析器等，可以直接使用PULL或SAX解析XML，直接把JAVA中进行PULL或SAX解析的代码直接拿来用，遗忘的话，可以参考java拾遗1,2,3关于XML的解析：
如有如下XmlUtils类实现PULL方式解析XML到List和序列化List到XML：
Student实体类代码：
package cn.csc.bean;
public class Student {
private String id;
private String name;
private String gender;
private int age;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Student() {
super();
}
public Student(String id, String name, String gender, int age) {
super();
this.id = id;
this.name = name;
this.gender = gender;
this.age = age;
}
@Override
public String toString() {
return "["+id+","+name+","+gender+","+age+"]";
}
}
XmlUtils类的代码：
public class XmlUtils {
public static void serialize(Context context, String filename, List<Student> list){
try {
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlSerializer serializer = factory.newSerializer();
serializer.setOutput(context.openFileOutput(filename, Context.MODE_PRIVATE), "utf-8");
serializer.startDocument("utf-8", true);
serializer.startTag(null, "students");
for(Student s:list){
serializer.startTag(null, "student");
serializer.attribute(null, "id", s.getId());
serializer.startTag(null, "name");
serializer.text(s.getName());
serializer.endTag(null, "name");
serializer.startTag(null, "gender");
serializer.text(s.getGender());
serializer.endTag(null, "gender");
serializer.startTag(null, "age");
serializer.text(s.getAge()+"");
serializer.endTag(null, "age");
serializer.endTag(null, "student");
}
serializer.endTag(null, "students");
serializer.endDocument();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static List<Student> parse(Context context, String filename){
List<Student> list = new ArrayList<Student>();
try {
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser parser = factory.newPullParser();
parser.setInput(context.openFileInput(filename), "utf-8");
Student s = null;
int eventType = parser.getEventType();
while(eventType != XmlPullParser.END_DOCUMENT){
if(eventType == XmlPullParser.START_TAG){
String tag = parser.getName();
if(tag.equals("student")){
s = new Student();
s.setId(parser.getAttributeValue(0));
}else if(tag.equals("name")){
s.setName(parser.nextText());
}else if(tag.equals("gender")){
s.setGender(parser.nextText());
}else if(tag.equals("age")){
s.setAge(Integer.parseInt(parser.nextText()));
}
}else if(eventType == XmlPullParser.END_TAG && parser.getName().equals("student")){
list.add(s);
}
eventType = parser.next();
}
for(Student stu : list){
Log.i("XML_PARSER",stu.toString());
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
return list;
}
}
使用Android Juit分别测试这两个方法：
public class XmlTest extends AndroidTestCase {
public void testSerializer(){
List<Student> list = new ArrayList<Student>();
for(int i=0; i<20; i++){
list.add(new Student(i+"","dqrcsc","male",25));
}
XmlUtils.serialize(getContext(), "students.xml", list);
}
public void testParser(){
XmlUtils.parse(getContext(), "students.xml");
}
}
运行结果：
以上代码，除了获取Context上下文对象外，与Java项目中对XML的PULL解析是完全一样的。
实际上，Andoid在android.util包中还提供了一个Xml类，实现了对XML解析、序列化操作的封装，在使用时，可以相对简单一点：
这五个静态方法分别简化了PULL解析器、PULL序列化器、SAX解析的操作：
之前通过工厂类实例获取PULL序列化器的操作，可以从：
XmlPullParserFactory factory = XmlPullParserFactory.newInstance(); XmlSerializer serializer = factory.newSerializer();
简化为：
XmlSerializer serializer = Xml.newSerializer();
通过工厂类实例获取PULL解析器的操作，也可以从：
XmlPullParserFactory factory = XmlPullParserFactory.newInstance(); XmlPullParser parser = factory.newPullParser();
简化为：
XmlPullParser parser = Xml.newPullParser();
同样的，SAX解析也简化为直接调用Xml的parse()静态方法，这里就不说明了。