Android开发学习---使用XmlPullParser解析xml文件

Android中解析XML的方式主要有三种:sax,dom和pull关于其内容可参考:http://blog.csdn.net/liuhe688/article/details/6415593

本文将主要介绍pull解析器解析xml文件,环境为ubuntu 12.04+ intelij 13.1 + android sdk 2.1

一.创建一个XML项目,步骤如下:

二.解析一个xml文件:

assets/person.xml

<?xml version="1.0" encoding="UTF-8"?><persons>    <person id="1101">        <name>amos</name>        <age>30</age>    </person>    <person id="1102">        <name>tom</name>        <age>18</age>    </person></persons>

com/amos/xml/domain/Person.java

package com.amos.xml.domain;/** * Created by amosli on 14-6-3. */public class Person {    private String name;    private Integer age;    private Integer id;    public Integer getAge() {        return age;    }    public void setAge(Integer age) {        if (age < 1 || age > 100) {            this.age = 0;        } else {            this.age = age;        }    }    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }}

com/amos/xml/service/PersonService.java

package com.amos.xml.service;import android.content.Context;import android.content.res.AssetManager;import android.util.Log;import android.util.Xml;import com.amos.xml.domain.Person;import org.xmlpull.v1.XmlPullParser;import java.io.InputStream;import java.util.ArrayList;import java.util.List;/** * Created by amosli on 14-6-3. */public class PersonService {    private Context context;    public PersonService(Context context) { this.context = context; } /**     * 把person.xml的输入流解析转化成list集合     *     * @param     * @return     */    public List<Person> getPersons(String filename) {        AssetManager manager = context.getAssets();        //初始化项目.      List<Person> persons = null;        Person person = null;        try {            InputStream inputStream = manager.open(filename);            //在android下使用xmlpullparser进行解析            XmlPullParser xmlPullParser = Xml.newPullParser();            //设置xmlpullparser的一些参数            xmlPullParser.setInput(inputStream, "utf-8");            //获取pull解析器对应事件类型            int eventType = xmlPullParser.getEventType();            while (eventType != XmlPullParser.END_DOCUMENT) { switch (eventType) {                    case XmlPullParser.START_DOCUMENT:                        persons = new ArrayList<Person>();                        break;                    case XmlPullParser.START_TAG: if (xmlPullParser.getName().equals("person")) {                            person = new Person();                            String id = xmlPullParser.getAttributeValue(0);                            Log.d("person.id", id);                            person.setId(Integer.parseInt(id));                            eventType = xmlPullParser.next();                        } else if (xmlPullParser.getName().equals("name")) {                            String name = xmlPullParser.nextText();                            Log.d("person.name", name);                            person.setName(name);                            eventType = xmlPullParser.next();                        } else if (xmlPullParser.getName().equals("age")) {                            String age = xmlPullParser.nextText();                            Log.d("person.age", age);                            person.setAge(Integer.valueOf(age));                            eventType = xmlPullParser.next();                        }                           break;                    case XmlPullParser.END_TAG: if (xmlPullParser.getName().equals("person")) {                            persons.add(person);                            person = null;                        }                        break;                }                eventType = xmlPullParser.next();            }        } catch (Exception e) {            e.printStackTrace();        }        return persons;    }}

注:这里解析主要用到的是eventType(事件类型),如果是START_DOCUMENT则表示读到文档开始位置,如果是START_TAG,则表示读到文档中的元素开始位置,如<name>,类似的结束位置为END_DOCUMENT和END_TAG;其中要注意判断其事件类型开始的名称是什么,并且取值时,注意其不同位置取值方式也不一样,如<person id="1122">,那么取id的方式为getAttributeValue(int index),另外取<name >amos</name>,则要用nextText()方法进行取值.

/com/amos/xml/MyActivity.java

package com.amos.xml;import android.app.Activity;import android.os.Bundle;import android.widget.TextView;import android.widget.Toast;import com.amos.xml.domain.Person;import com.amos.xml.service.PersonService;import java.util.List;public class MyActivity extends Activity {    /**     * Called when the activity is first created.     */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        TextView show_users = (TextView) findViewById(R.id.show_users);        PersonService personService = new PersonService(this);        StringBuilder stringBuilder = new StringBuilder();        List<Person> persons = personService.getPersons("person.xml"); for (Person person : persons) { stringBuilder.append("  " + person.getName()).append(":").append(person.getAge()); }        System.out.println("stringBuilder:" + stringBuilder);        show_users.setText(stringBuilder);        Toast.makeText(this, "数据写入成功!" + stringBuilder, Toast.LENGTH_LONG);    }}

这里我在主界面定义了一个TextView,用来显示读取到的xml文件的内容,效果如下图所示:

3.测试用例

首先,加入必要的配置:AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"          package="com.amos.xml"          android:versionCode="1"          android:versionName="1.0">    <uses-sdk android:minSdkVersion="7"/>    <application android:label="@string/app_name">        <uses-library android:name="android.test.runner"/>        <activity android:name="MyActivity"                  android:label="@string/app_name">            <intent-filter>                <action android:name="android.intent.action.MAIN"/>                <category android:name="android.intent.category.LAUNCHER"/>            </intent-filter>        </activity>    </application>    <instrumentation android:name="android.test.InstrumentationTestRunner" android:targetPackage="com.amos.xml"/></manifest>

其中加粗的部分是后加入到项目中的.

其次,写一个testcase:/com/amos/xml/test/TestService.java

package com.amos.xml.test;import android.test.AndroidTestCase;import com.amos.xml.domain.Person;import com.amos.xml.service.PersonService;import java.util.List;/** * Created by amosli on 14-6-3. */public class TestService extends AndroidTestCase {    public void testGetPersons() throws Exception {        PersonService personService = new PersonService(getContext()); List<Person> persons = personService.getPersons("person.xml"); for (Person person : persons) { System.out.println(person.getName()); }    }}

这里想要查看每一步的运行步骤,可以加上断点,intelij 中的快捷键是F8(step over),F7(step into),F9(Resume program).

本文git 地址:https://github.com/amosli/android_basic/tree/xml

一.创建一个XML项目,步骤如下:

3.测试用例

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