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 + "]
";
    }
}

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>