Android Xml的解析

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要解析的Xml

<?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>

解析用到的JavaBean

package com.example.a19_xml_parse;public class Channel {    public String temp;    public String city;    public String id;    public String pm250;    public String wind;    public String getTemp() {        return temp;    }    public void setTemp(String temp) {        this.temp = temp;    }    public String getCity() {        return city;    }    public void setCity(String city) {        this.city = city;    }    public String getId() {        return id;    }    public void setId(String id) {        this.id = id;    }    public String getPm250() {        return pm250;    }    public void setPm250(String pm250) {        this.pm250 = pm250;    }    public String getWind() {        return wind;    }    public void setWind(String wind) {        this.wind = wind;    }    @Override    public String toString() {        return "Channel [id=" + id +", city=" + city + ", temp=" + temp + ", wind=" + wind + ", pm250=" +pm250 + "]";    }}

解析者：

package com.example.a19_xml_parse;import android.util.Xml;import org.xmlpull.v1.XmlPullParser;import java.io.InputStream;import java.util.ArrayList;import java.util.List;/** * Created by Administrator on 2017/4/14. */public class WeatherParser {    /**     * 服务器是以流的形式把数据返回的     * @return     */    public static List<Channel> parserXml(InputStream in) throws Exception {        //0 声明集合对象        List<Channel> weatherLists = null;        Channel channel = null;        //1 获取XmlPullParser 解析的实例        XmlPullParser parser = Xml.newPullParser();        //2 设置XmlPullParser的参数        parser.setInput(in, "utf-8");        //3 获取事件类型        int type = parser.getEventType();        while (type != XmlPullParser.END_DOCUMENT) {            switch (type) {                case XmlPullParser.START_TAG: //解析开始标签                   //4 具体判断一下 解析到哪个开始标志                    if ("weather".equals(parser.getName())) {                        //5 创建一个集合对象                        weatherLists = new ArrayList<Channel>();                    } else if ("channel".equals(parser.getName())) {                        //6 创建channel对象                        channel = new Channel();                        //7 获取id值                        String id = parser.getAttributeValue(0);                        channel.setId(id);                    } else if ("city".equals(parser.getName())) {                        //8 获取city的数据                        String city = parser.nextText();                        channel.setCity(city);                    } else if ("temp".equals(parser.getName())) {                        String temp = parser.nextText();                        channel.setTemp(temp);                    } else if ("wind".equals(parser.getName())) {                        String wind = parser.nextText();                        channel.setWind(wind);                    } else if ("pm250".equals(parser.getName())) {                        String pm250 = parser.nextText();                        channel.setPm250(pm250);                    }                    break;                case XmlPullParser.END_TAG: //解析结束标签                    //判断要解析的结束标签                    if ("channel".equals(parser.getName())) {                        //把javabean对象存到集合中                        weatherLists.add(channel);                    }                    break;            }            //不停的向下解析            type = parser.next();        }        return weatherLists;    }}

MainActivity

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        try {            //1 显示天气信息            TextView tv_weather = (TextView) findViewById(R.id.tv_weather);            //1.1 通过上下文获取资产的管理者            InputStream inputStream = getAssets().open("weather.xml");            //2 调用我们定义的解析xml业务方法            List<Channel> weatherLists = WeatherParser.parserXml(inputStream);            StringBuffer sb = new StringBuffer();            for (Channel channel : weatherLists) {                sb.append(channel.toString());            }            //3 把数据显示到textview上            tv_weather.setText(sb.toString());        } catch (Exception e) {            e.printStackTrace();        }    }}

StringBuffer线程安全，StringBuilder线程不安全

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