android XMLPullParser使用教程 androidXMLPullParser|Android

Android建议使用XMLPullParser比SAX和DOM解析xml文件，因为它速度快。
org.xmlpull.v1.XmlPullParser接口提供使用XMLPullParser解析XML文档的功能。
XmlPullParser的事件
XMLPullParser的next（）方法将光标指针移动到下一个事件。通常，我们使用XMLPullParser接口中定义的四个常量（作为事件工作）。
START_TAG：已读取XML开始标签。
TEXT：阅读了文本内容；可以使用getText（）方法检索文本内容。
END_TAG：已读取结束标签。
END_DOCUMENT：无更多活动可用
android XMLPullParser的示例
activity_main.xml从面板拖动一个列表视图。现在，activity_main.xml文件将如下所示：

< 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" tools:context=".MainActivity" >< ListView android:id="@+id/listView1" android:layout_width="match_parent" android:layout_height="wrap_content" >< /ListView>< /RelativeLayout>

xml文件在项目的资产目录内创建一个名为employee.xml的xml文件。

< ?xml version="1.0" encoding="UTF-8"?> < employees> < employee> < id>1< /id> < name>Sachin< /name> < salary>50000< /salary> < /employee> < employee> < id>2< /id> < name>Nikhil< /name> < salary>60000< /salary> < /employee>< /employees>

员工阶层现在创建与xml文件对应的Employee类。

package com.example.xmlpullparsing; public class Employee { private int id; private String name; private float salary; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public float getSalary() { return salary; } public void setSalary(float salary) { this.salary = salary; } @Override public String toString() { return " Id= "+id + "\n Name= " + name + "\n Salary= " + salary; } }

XMLPullParserHandler类现在，编写代码以使用XMLPullParser解析xml文件。在这里，我们返回列表中的所有员工。

package com.example.xmlpullparsing; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import java.util.List; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; import org.xmlpull.v1.XmlPullParserFactory; public class XmlPullParserHandler { private List< Employee> employees= new ArrayList< Employee>(); private Employee employee; private String text; public List< Employee> getEmployees() { return employees; } public List< Employee> parse(InputStream is) { try { XmlPullParserFactory factory = XmlPullParserFactory.newInstance(); factory.setNamespaceAware(true); XmlPullParserparser = factory.newPullParser(); parser.setInput(is, null); int eventType = parser.getEventType(); while (eventType != XmlPullParser.END_DOCUMENT) { String tagname = parser.getName(); switch (eventType) { case XmlPullParser.START_TAG: if (tagname.equalsIgnoreCase("employee")) { // create a new instance of employee employee = new Employee(); } break; case XmlPullParser.TEXT: text = parser.getText(); break; case XmlPullParser.END_TAG: if (tagname.equalsIgnoreCase("employee")) { // add employee object to list employees.add(employee); }else if (tagname.equalsIgnoreCase("id")) { employee.setId(Integer.parseInt(text)); }else if (tagname.equalsIgnoreCase("name")) { employee.setName(text); } else if (tagname.equalsIgnoreCase("salary")) { employee.setSalary(Float.parseFloat(text)); } break; default: break; } eventType = parser.next(); } } catch (XmlPullParserException e) {e.printStackTrace(); } catch (IOException e) {e.printStackTrace(); } return employees; } }

MainActivity类【android XMLPullParser使用教程】现在，编写代码以在ListView中显示列表数据。

package com.example.xmlpullparsing; import java.io.IOException; import java.io.InputStream; import java.util.List; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.widget.ArrayAdapter; import android.widget.ListView; public class MainActivity extends Activity {@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ListView listView = (ListView) findViewById(R.id.listView1); List< Employee> employees = null; try { XmlPullParserHandler parser = new XmlPullParserHandler(); InputStream is=getAssets().open("employees.xml"); employees = parser.parse(is); ArrayAdapter< Employee> adapter =new ArrayAdapter< Employee> (this, android.R.layout.simple_list_item_1, employees); listView.setAdapter(adapter); } catch (IOException e) {e.printStackTrace(); }}@Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; }}

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