XML解析实例--------获得天气预报数据

XML解析实例--------获得天气预报数据

运行效果图：
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工程结构图：
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一、MainActivity:

package com.amaker.flipper;

import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.util.List;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.apache.http.HttpEntity;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import android.app.Activity;
import android.app.ListActivity;
import android.content.Context;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends ListActivity {
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		/*setContentView(R.layout.main);
		String str = getWeatherAsString();
		Toast.makeText(getApplicationContext(), str, Toast.LENGTH_LONG).show();*/
		setListAdapter(new MyAdpter(MainActivity.this));
	}

	private static class MyAdpter extends BaseAdapter {
		List<Weather> list;
		LayoutInflater inflater;
		public MyAdpter(Context context) {
			list = readXml();
			inflater = LayoutInflater.from(context);
		}

		@Override
		public int getCount() {
			return list.size();
		}

		@Override
		public Object getItem(int arg0) {
			return null;
		}

		@Override
		public long getItemId(int arg0) {
			return 0;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			ViewHolder holder;
			InputStream in = null;
			Weather w = list.get(position);
			String icon = w.getIcon();
			String iconUrl = "http://www.google.com"+icon;
			try {
				URL url = new URL(iconUrl);
				try {
					in = url.openStream();
				} catch (IOException e) {
					e.printStackTrace();
				}
			} catch (MalformedURLException e) {
				e.printStackTrace();
			}
			if (convertView == null) {
				convertView = inflater.inflate(R.layout.list_item, null);
				holder = new ViewHolder();
				holder.icon = (ImageView) convertView
						.findViewById(R.id.icon_imageView1);
				holder.week_tv = (TextView) convertView
						.findViewById(R.id.week_textView1);
				holder.condition_tv = (TextView) convertView
						.findViewById(R.id.condition_textView2);
				holder.low_tv = (TextView) convertView
						.findViewById(R.id.low_textView3);
				holder.high_tv = (TextView) convertView
						.findViewById(R.id.high_textView4);
				convertView.setTag(holder);
			} else {
				holder = (ViewHolder) convertView.getTag();
			}
			holder.icon.setImageBitmap(BitmapFactory.decodeStream(in));
			holder.week_tv.setText(w.getWeek());
			holder.condition_tv.setText(w.getCondition());
			holder.low_tv.setText(w.getLow()+"");
			holder.high_tv.setText(w.getHight()+"");
			return convertView;

		}

		static class ViewHolder {
			ImageView icon;
			TextView week_tv;
			TextView condition_tv;
			TextView low_tv;
			TextView high_tv;
		}

	}

	static List<Weather> readXml() {
		SAXParserFactory factory = SAXParserFactory.newInstance();
		try {
			SAXParser parser = factory.newSAXParser();
			InputSource is = null;
			is = new InputSource(new StringReader(getWeatherAsString()));
			MyHandler dh = new MyHandler();
			try {
				parser.parse(is, dh);
				return dh.list();
			} catch (IOException e) {
				e.printStackTrace();
			}
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		} catch (SAXException e) {
			e.printStackTrace();
		}
		return null;
	}

	// 得到天气情况的xml
	public static String getWeatherAsString() {
		String strUrl = "http://www.google.com/ig/api?hl=zh-cn&weather=Beijing";
		HttpGet getRequest = new HttpGet(strUrl);
		DefaultHttpClient client = new DefaultHttpClient();
		try {
			HttpResponse response = client.execute(getRequest);
			if (response.getStatusLine().getStatusCode() == 200) {
				HttpEntity entity = response.getEntity();
				return EntityUtils.toString(entity);
			}
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}
}

二、MyHandler

package com.amaker.flipper;

import java.util.ArrayList;
import java.util.List;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class MyHandler extends DefaultHandler {
	List<Weather> list;
	Weather currentWeather;
	
	public List<Weather> list(){
		return list;
	}
	@Override
	public void startDocument() throws SAXException {
		super.startDocument();
		list = new ArrayList<Weather>();
	}
	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		super.startElement(uri, localName, qName, attributes);
		if(qName!=null&&qName.equals("forecast_conditions")){
			currentWeather = new Weather();
		}
		if(qName!=null&&qName.equals("day_of_week")){
			String week = attributes.getValue("data");
			if(currentWeather!=null){
				currentWeather.setWeek(week);
			}
			
		}
		if(qName!=null&&qName.equals("low")){
			int low = Integer.parseInt(attributes.getValue("data"));
			if(currentWeather!=null){
				currentWeather.setLow(low);
			}
			
		}
		if(qName!=null&&qName.equals("high")){
			int hight = Integer.parseInt(attributes.getValue("data"));
			if(currentWeather!=null){
				currentWeather.setHight(hight);
			}
			
		}
		if(qName!=null&&qName.equals("icon")){
			String icon = attributes.getValue("data");
			if(currentWeather!=null){
				currentWeather.setIcon(icon);
			}	
			
		}
		if(qName!=null&&qName.equals("condition")){
			String condition = attributes.getValue("data");
			if(currentWeather!=null){
				currentWeather.setCondition(condition);
			}
			
			
		}
		
	}
	@Override
	public void characters(char[] ch, int start, int length)
			throws SAXException {
		super.characters(ch, start, length);
	}
	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		super.endElement(uri, localName, qName);
		if(qName!=null&&qName.equals("forecast_conditions")){
			list.add(currentWeather);
		}
	}
	@Override
	public void endDocument() throws SAXException {
		super.endDocument();
	}
}

三、Weather:

package com.amaker.flipper;

public class Weather {
	private String week;
	private int low;
	private int hight;
	private String icon;
	private String condition;
	
	
	
	@Override
	public String toString() {
		return "Weather [condition=" + condition + ", hight=" + hight
				+ ", icon=" + icon + ", low=" + low + ", week=" + week + "]";
	}
	public String getWeek() {
		return week;
	}
	public void setWeek(String week) {
		this.week = week;
	}
	public int getLow() {
		return low;
	}
	public void setLow(int low) {
		this.low = low;
	}
	public int getHight() {
		return hight;
	}
	public void setHight(int hight) {
		this.hight = hight;
	}
	public String getIcon() {
		return icon;
	}
	public void setIcon(String icon) {
		this.icon = icon;
	}
	public String getCondition() {
		return condition;
	}
	public void setCondition(String condition) {
		this.condition = condition;
	}
	
	
}

四、list_item:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<ImageView
		android:layout_height="wrap_content"
		android:id="@+id/icon_imageView1"
		android:src="@drawable/icon"
		android:layout_width="wrap_content" />
	<TextView
		android:text=""
		android:id="@+id/week_textView1"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" />
	<TextView
		android:text=""
		android:id="@+id/condition_textView2"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" />
	<TextView
		android:text=""
		android:id="@+id/low_textView3"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" />
	<TextView
		android:text=""
		android:id="@+id/high_textView4"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" />
</LinearLayout>

记得添加权限：

<uses-permission android:name="android.permission.INTERNET"></uses-permission>