Get weather info from Yahoo! Weather RSS Feed

The Yahoo! Weather RSS feed enables you to get up-to-date weather information, http://developer.yahoo.com/weather/.

The Weather RSS feed request follows simple HTTP GET syntax: start with a base URL and then add parameters and values after a question mark (?).

ex: Weather RSS feed for New York
http://weather.yahooapis.com/forecastrss?w=2459115

where 2459115 is WOEID for New York. You can find the code for any location from http://weather.yahoo.com/.

The another exercise show how to Search WOEID from http://query.yahooapis.com/.

The returned XML will like it:

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<rss version="2.0" xmlns:yweather="http://xml.weather.yahoo.com/ns/rss/1.0" xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#">
 <channel>

<title>Yahoo! Weather - New York, NY</title>
<link>http://us.rd.yahoo.com/dailynews/rss/weather/New_York__NY/*http://weather.yahoo.com/forecast/USNY0996_f.html</link>
<description>Yahoo! Weather for New York, NY</description>
<language>en-us</language>
<lastBuildDate>Fri, 23 Mar 2012 8:49 pm EDT</lastBuildDate>
<ttl>60</ttl>
<yweather:location city="New York" region="NY"   country="United States"/>
<yweather:units temperature="F" distance="mi" pressure="in" speed="mph"/>
<yweather:wind chill="60"   direction="0"   speed="0" />
<yweather:atmosphere humidity="49"  visibility="10"  pressure="30.08"  rising="0" />
<yweather:astronomy sunrise="6:52 am"   sunset="7:10 pm"/>
<image>
<title>Yahoo! Weather</title>
<width>142</width>
<height>18</height>
<link>http://weather.yahoo.com</link>
<url>http://l.yimg.com/a/i/brand/purplelogo//uh/us/news-wea.gif</url>
</image>
<item>
<title>Conditions for New York, NY at 8:49 pm EDT</title>
<geo:lat>40.71</geo:lat>
<geo:long>-74.01</geo:long>
<link>http://us.rd.yahoo.com/dailynews/rss/weather/New_York__NY/*http://weather.yahoo.com/forecast/USNY0996_f.html</link>
<pubDate>Fri, 23 Mar 2012 8:49 pm EDT</pubDate>
<yweather:condition  text="Fair"  code="33"  temp="60"  date="Fri, 23 Mar 2012 8:49 pm EDT" />
<description><![CDATA[
<img src="http://l.yimg.com/a/i/us/we/52/33.gif"/><br />
<b>Current Conditions:</b><br />
Fair, 60 F<BR />
<BR /><b>Forecast:</b><BR />
Fri - Mostly Cloudy. High: 72 Low: 52<br />
Sat - PM Showers. High: 61 Low: 49<br />
<br />
<a href="http://us.rd.yahoo.com/dailynews/rss/weather/New_York__NY/*http://weather.yahoo.com/forecast/USNY0996_f.html">Full Forecast at Yahoo! Weather</a><BR/><BR/>
(provided by <a href="http://www.weather.com" >The Weather Channel</a>)<br/>
]]></description>
<yweather:forecast day="Fri" date="23 Mar 2012" low="52" high="72" text="Mostly Cloudy" code="27" />
<yweather:forecast day="Sat" date="24 Mar 2012" low="49" high="61" text="PM Showers" code="39" />
<guid isPermaLink="false">USNY0996_2012_03_24_7_00_EDT</guid>
</item>
</channel>
</rss>
<!-- api1.weather.sg1.yahoo.com compressed/chunked Fri Mar 23 18:50:03 PDT 2012 -->

It's a example to get Get weather info from Yahoo! Weather RSS Feed. Query Yahoo using HttpGet, then parse the returned XML using DOM. Please note that I only parse the returned RSS partially for demonstration, NOT ALL.

package com.exercise.AndroidYahooWeatherDOM;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidYahooWeatherDOMActivity extends Activity {

TextView weather;

class MyWeather{
String description;
String city;
String region;
String country;

String windChill;
String windDirection;
String windSpeed;

String sunrise;
String sunset;

String conditiontext;
String conditiondate;

public String toString(){

 return "\n- " + description + " -\n\n"
  + "city: " + city + "\n"
  + "region: " + region + "\n"
  + "country: " + country + "\n\n"

  + "Wind\n"
  + "chill: " + windChill + "\n"
  + "direction: " + windDirection + "\n"
  + "speed: " + windSpeed + "\n\n"

  + "Sunrise: " + sunrise + "\n"
  + "Sunset: " + sunset + "\n\n"

  + "Condition: " + conditiontext + "\n"
  + conditiondate +"\n";
 
}
}

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
     weather = (TextView)findViewById(R.id.weather);
  
  
     String weatherString = QueryYahooWeather();
     Document weatherDoc = convertStringToDocument(weatherString);

     MyWeather weatherResult = parseWeather(weatherDoc);
     weather.setText(weatherResult.toString());
 }

 private MyWeather parseWeather(Document srcDoc){

  MyWeather myWeather = new MyWeather();

  //<description>Yahoo! Weather for New York, NY</description>
  myWeather.description = srcDoc.getElementsByTagName("description")
    .item(0)
    .getTextContent();

  //<yweather:location city="New York" region="NY" country="United States"/>
  Node locationNode = srcDoc.getElementsByTagName("yweather:location").item(0);
  myWeather.city = locationNode.getAttributes()
  .getNamedItem("city")
  .getNodeValue()
  .toString();
myWeather.region = locationNode.getAttributes()
  .getNamedItem("region")
  .getNodeValue()
  .toString();
myWeather.country = locationNode.getAttributes()
  .getNamedItem("country")
  .getNodeValue()
  .toString();

//<yweather:wind chill="60" direction="0" speed="0"/>
Node windNode = srcDoc.getElementsByTagName("yweather:wind").item(0);
myWeather.windChill = windNode.getAttributes()
  .getNamedItem("chill")
  .getNodeValue()
  .toString();
myWeather.windDirection = windNode.getAttributes()
  .getNamedItem("direction")
  .getNodeValue()
  .toString();
myWeather.windSpeed = windNode.getAttributes()
  .getNamedItem("speed")
  .getNodeValue()
  .toString();

//<yweather:astronomy sunrise="6:52 am" sunset="7:10 pm"/>
Node astronomyNode = srcDoc.getElementsByTagName("yweather:astronomy").item(0);
myWeather.sunrise = astronomyNode.getAttributes()
  .getNamedItem("sunrise")
  .getNodeValue()
  .toString();
myWeather.sunset = astronomyNode.getAttributes()
  .getNamedItem("sunset")
  .getNodeValue()
  .toString();

//<yweather:condition text="Fair" code="33" temp="60" date="Fri, 23 Mar 2012 8:49 pm EDT"/>
Node conditionNode = srcDoc.getElementsByTagName("yweather:condition").item(0);
myWeather.conditiontext = conditionNode.getAttributes()
  .getNamedItem("text")
  .getNodeValue()
  .toString();
myWeather.conditiondate = conditionNode.getAttributes()
  .getNamedItem("date")
  .getNodeValue()
  .toString();

  return myWeather;
 }

 private Document convertStringToDocument(String src){
  Document dest = null;

  DocumentBuilderFactory dbFactory =
    DocumentBuilderFactory.newInstance();
  DocumentBuilder parser;

  try {
   parser = dbFactory.newDocumentBuilder();
 dest = parser.parse(new ByteArrayInputStream(src.getBytes()));
} catch (ParserConfigurationException e1) {
 e1.printStackTrace();
 Toast.makeText(AndroidYahooWeatherDOMActivity.this,
     e1.toString(), Toast.LENGTH_LONG).show();
} catch (SAXException e) {
 e.printStackTrace();
 Toast.makeText(AndroidYahooWeatherDOMActivity.this,
     e.toString(), Toast.LENGTH_LONG).show();
} catch (IOException e) {
 e.printStackTrace();
 Toast.makeText(AndroidYahooWeatherDOMActivity.this,
     e.toString(), Toast.LENGTH_LONG).show();
}

  return dest;
 }

 private String QueryYahooWeather(){

  String qResult = "";
  String queryString = "http://weather.yahooapis.com/forecastrss?w=2459115";

  HttpClient httpClient = new DefaultHttpClient();
     HttpGet httpGet = new HttpGet(queryString);
  
     try {
      HttpEntity httpEntity = httpClient.execute(httpGet).getEntity();
    
      if (httpEntity != null){
       InputStream inputStream = httpEntity.getContent();
       Reader in = new InputStreamReader(inputStream);
       BufferedReader bufferedreader = new BufferedReader(in);
       StringBuilder stringBuilder = new StringBuilder();
     
       String stringReadLine = null;

       while ((stringReadLine = bufferedreader.readLine()) != null) {
        stringBuilder.append(stringReadLine + "\n");
       }
     
       qResult = stringBuilder.toString();
      }

} catch (ClientProtocolException e) {
 e.printStackTrace();
 Toast.makeText(AndroidYahooWeatherDOMActivity.this,
     e.toString(), Toast.LENGTH_LONG).show();
} catch (IOException e) {
 e.printStackTrace();
 Toast.makeText(AndroidYahooWeatherDOMActivity.this,
     e.toString(), Toast.LENGTH_LONG).show();
}

     return qResult;
 }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:orientation="vertical" >

 <TextView
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text="@string/hello" />
 <ScrollView
     android:layout_width="fill_parent"
     android:layout_height="fill_parent">
     <TextView
         android:id="@+id/weather"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content" />
 </ScrollView>

</LinearLayout>

You have to modify AndroidManifest.xml to grand permission of "android.permission.INTERNET"

Download the files.

Next:
- Get description from Yahoo! Weather RSS feed, and display in WebView.
- Search WOEID from http://query.yahooapis.com/.
- Get Google Weather