Android 采用pull解析xml文件

XML文件：

<?xml version="1.0" encoding="utf-8"?>

<infos>
	<city id="1">
		<name>上海</name>
		<temperature>15℃~20℃</temperature>
		<weather>多云转晴</weather>
		<wind>偏东风3~5级</wind>
	</city>
	<city id="1">
		<name>北京</name>
		<temperature>18℃~22℃</temperature>
		<weather>阵雨转多云</weather>
		<wind>偏东风4~8级</wind>
	</city>
	<city id="1">
		<name>哈尔滨</name>
		<temperature>5℃~10℃</temperature>
		<weather>晴</weather>
		<wind>偏东风1~2级</wind>
	</city>
</infos>

 

Java代码：

package cn.jinyejun.android_domain;

/**
 * 天气对象，用来保存天气所有属性
 * 
 * @author jinyejun
 * @date 2014-10-31 17:00
 */
public class WeatherInfo {
	private int id;
	private String name;
	private String temperature;
	private String weather;
	private String wind;

	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 String getTemperature() {
		return temperature;
	}

	public void setTemperature(String temperature) {
		this.temperature = temperature;
	}

	public String getWeather() {
		return weather;
	}

	public void setWeather(String weather) {
		this.weather = weather;
	}

	public String getWind() {
		return wind;
	}

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

	@Override
	public String toString() {
		String str = String.format("%s\n温度：%s\n天气：%s\n风速：%s", name,
				temperature, weather, wind);
		System.out.println();
		return str;
	}
}

 

package cn.jinyejun.android_service;

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

import org.xmlpull.v1.XmlPullParser;

import android.content.Context;
import android.util.Xml;
import android.widget.Toast;
import cn.jinyejun.android_domain.WeatherInfo;

/**
 * 天气业务类 用来解析xml文件获取天气信息
 * 
 * @author jinyejun date : 2014-10-31 17:00
 */
public class WeatherService {

	/**
	 * 用Pull方式解析xml文件
	 * 
	 * @param context
	 *            上下文
	 * @param is
	 *            xml文件流
	 * @return weatherInfo 获取的天气集合
	 */
	public final static List<WeatherInfo> getWeatherInfo(Context context,
			InputStream is) {
		
		//创建xml文件解析器
		XmlPullParser parser = Xml.newPullParser();
		try {
			//指定xml文件输入流以及编码方式
			parser.setInput(is, "utf-8");
			//创建天气对象用来存放天气各个属性
			WeatherInfo info = null;
			//创建天气集合，用来保存解析到的每个天气对象
			List<WeatherInfo> weatherInfo = null;
			//获取解析器解析到的事件类型
			int type = parser.getEventType();
			
			//当事件类型不是文档结束标志的时候继续执行
			while (type != XmlPullParser.END_DOCUMENT) {
				
				switch (type) {
				
				//如果遇到开始标签，那么根据标签获取实际内容并且给天气对象对应属性赋值
				case XmlPullParser.START_TAG:
					if ("infos".equals(parser.getName())) {
						weatherInfo = new ArrayList<WeatherInfo>();
					} else if ("city".equals(parser.getName())) {
						info = new WeatherInfo();
						String idStr = parser.getAttributeValue(null, "id");
						info.setId(Integer.parseInt(idStr));
					} else if ("name".equals(parser.getName())) {
						String name = parser.nextText();
						info.setName(name);
					} else if ("temperature".equals(parser.getName())) {
						String temperature = parser.nextText();
						info.setTemperature(temperature);
					} else if ("weather".equals(parser.getName())) {
						String weather = parser.nextText();
						info.setWeather(weather);
					} else if ("wind".equals(parser.getName())) {
						String wind = parser.nextText();
						info.setWind(wind);
					}
					break;
				//如果遇到结束标签说明已经解析完xml中一个节点
				case XmlPullParser.END_TAG:
					if ("city".equals(parser.getName())) {
						//将获取到的天气对象放在天气集合中
						weatherInfo.add(info);
						//释放info内存
						info = null;
					}
					break;
				}
				
				//很重要！！必须移到下一个，不然就是死循环
				type = parser.next();

			}
			return weatherInfo;
		} catch (Exception e) {
			e.printStackTrace();
			Toast.makeText(context, "读取文件失败", Toast.LENGTH_SHORT);
			return null;
		}

	}
}

 

package cn.jinyejun.android_weatherreport;

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

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.widget.TextView;
import cn.jinyejun.android_domain.WeatherInfo;
import cn.jinyejun.android_service.WeatherService;

public class MainActivity extends ActionBarActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		TextView tv = (TextView) findViewById(R.id.tv_content);
		
		//用类加载器获取对应目录下的xml文件，放回文件输入流
		InputStream is = MainActivity.class.getClassLoader().getResourceAsStream("weather.xml");
		//获取天气集合
		List<WeatherInfo> infos = WeatherService.getWeatherInfo(this, is);
		StringBuffer sb = new StringBuffer();
		for(WeatherInfo info: infos){
			sb.append(info.toString());
			sb.append("\n\n");
		}
		tv.setText(sb.toString());
	}
}