安卓开发之利用XmlPullParser解析XML文件

 package com.lidaochen.phonecall;

 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.util.Xml;
 import android.view.View;
 import android.widget.TabHost;
 import android.widget.TextView;
 import android.widget.ThemedSpinnerAdapter;

 import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.List;

 public class MainActivity extends AppCompatActivity{
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         try
         {
             // 找到TextView控件
             TextView textView = (TextView)findViewById(R.id.textView);
             // 通过上下文获取资产管理者
             InputStream inputStream = getAssets().open("weather.xml");
             // 调用我们定义的方法解析XML文件
             List<Channel> weatherlists = WeatherParser.parserXml(inputStream);
             StringBuffer sb = new StringBuffer();
             for (Channel channel:weatherlists)
             {
                 sb.append(channel.toString());
             }
             // 将解析的文件内容显示到TextView控件上面
             textView.setText(sb.toString());
         }
         catch (Exception e)
         {
             e.printStackTrace();
         }
     }
 }

 package com.lidaochen.phonecall;

 import android.util.Xml;

 import org.xmlpull.v1.XmlPullParser;

 import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.List;

 public class WeatherParser {
     // 服务器是以流的形式把数据返回的
     public static List<Channel> parserXml(InputStream In) throws Exception
     {
         // 声明集合对象
         List<Channel> weatherlists = null;
         Channel channel = null;
         // 获取XmlPullParser解析的实例
         XmlPullParser xmlPullParser = Xml.newPullParser();
         // 设置XmlPullParser的参数
         xmlPullParser.setInput(In, "utf-8");
         // 获取事件类型
         int type = xmlPullParser.getEventType();
         while(type != XmlPullParser.END_DOCUMENT)
         {
             switch (type)
             {
                 case XmlPullParser.START_TAG:
                     if ("weather".equals(xmlPullParser.getName()))
                     {
                         // 创建一个集合对象
                         weatherlists = new ArrayList<Channel>();
                     }
                     else if ("channel".equals(xmlPullParser.getName()))
                     {
                         // 创建Channel对象
                         channel = new Channel();
                         // 获取id值
                         String id = xmlPullParser.getAttributeValue(0);
                         channel.setId(id);
                     }
                     else if ("city".equals(xmlPullParser.getName()))
                     {
                         String city = xmlPullParser.nextText();
                         channel.setCity(city);
                     }
                     else if ("temp".equals(xmlPullParser.getName()))
                     {
                         String temp = xmlPullParser.nextText();
                         channel.setTemp(temp);
                     }
                     else if ("wind".equals(xmlPullParser.getName()))
                     {
                         String wind = xmlPullParser.nextText();
                         channel.setWind(wind);
                     }
                     else if ("pm250".equals(xmlPullParser.getName()))
                     {
                         String pm250 = xmlPullParser.nextText();
                         channel.setPm250(pm250);
                     }
                     break;
                 case XmlPullParser.END_TAG:   // 解析结束标志
                     // 判断要解析的结束标签是不是channel
                     if ("channel".equals(xmlPullParser.getName()))
                     {
                         // 把javabean对象存到集合中
                         weatherlists.add(channel);
                     }
                     break;
             }
             // 不停的向下解析
             type = xmlPullParser.next();
         }

         return weatherlists;
     }
 }

 package com.lidaochen.phonecall;

 public class Channel {
     private String id;
     private String city;
     private String temp;
     private String wind;
     private String pm250;

     public String getId() {
         return id;
     }

     public void setId(String id) {
         this.id = id;
     }

     public String getCity() {
         return city;
     }

     public void setCity(String city) {
         this.city = city;
     }

     public String getTemp() {
         return temp;
     }

     public void setTemp(String temp) {
         this.temp = temp;
     }

     public String getWind() {
         return wind;
     }

     public void setWind(String wind) {
         this.wind = wind;
     }

     public String getPm250() {
         return pm250;
     }

     public void setPm250(String pm250) {
         this.pm250 = pm250;
     }

     @Override
     public  String toString()
     {
         return "Channel [id=" + id + ", city=" + city + ", temp=" + temp
                 + ", wind=" + wind + ", pm250=" + pm250 + "]\n";
     }
 }

下面是要解析的XML文件，需要放在assets目录下

 <?xml version="1.0" encoding="utf-8"?>
 <weather>
         <channel id ='1'>
              <city>北京</city>
              <temp>25°</temp>
              <wind>3</wind>
              <pm250>300</pm250>

         </channel>

          <channel id ='2'>
              <city>郑州</city>
              <temp>20°</temp>
              <wind>4</wind>
              <pm250>300</pm250>

         </channel>

         <channel id ='3'>
              <city>长春</city>
              <temp>10°</temp>
              <wind>4</wind>
              <pm250>100</pm250>

         </channel>

         <channel id ='4'>
              <city>沈阳</city>
              <temp>20°</temp>
              <wind>1</wind>
              <pm250>50</pm250>
         </channel>

 </weather>