Get yweather:forecast from Yahoo! Weather RSS Feed

Last exercise show how to "Get weather info from Yahoo! Weather RSS Feed in background thread". In the exercise, all the retrieved information have only one element, so I use item(0) to get the items. In this exercise, I will get <yweather:forecast> also.

For <yweather:forecast>, it have more than one item. So I get it as a NodeList, then travel along to retrieve all items.

package com.example.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.w3c.dom.NodeList;
import org.xml.sax.SAXException;

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

public class MainActivity 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;
  
  String numberOfForecast;
  String forecast;

  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"
    
    + "\n"
    + "number of forecast: " + numberOfForecast + "\n"
    + forecast;
   
  } 
 }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        weather = (TextView)findViewById(R.id.weather);

        Thread myThread = new Thread(new Runnable(){

   @Override
   public void run() {
    String weatherString = QueryYahooWeather();
          Document weatherDoc = convertStringToDocument(weatherString);
          
          final MyWeather weatherResult = parseWeather(weatherDoc);
          runOnUiThread(new Runnable(){

     @Override
     public void run() {
      weather.setText(weatherResult.toString());
     }});
          
   }});
        myThread.start();
    }
    
    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.../>
     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.../>
     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.../>
     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.../>
     Node conditionNode = srcDoc.getElementsByTagName("yweather:condition").item(0);
     myWeather.conditiontext = conditionNode.getAttributes()
       .getNamedItem("text")
       .getNodeValue()
       .toString();
     myWeather.conditiondate = conditionNode.getAttributes()
       .getNamedItem("date")
       .getNodeValue()
       .toString();
     
     //Added to get elements of <yweather:forecast.../>
     NodeList forecastList = srcDoc.getElementsByTagName("yweather:forecast");
     
     myWeather.forecast = "";
     if(forecastList.getLength() > 0){
      myWeather.numberOfForecast = String.valueOf(forecastList.getLength());
      for(int i = 0; i < forecastList.getLength(); i++){
       Node forecastNode = forecastList.item(i);
       myWeather.forecast +=
         forecastNode
          .getAttributes()
          .getNamedItem("date")
          .getNodeValue()
          .toString() + " " +
         forecastNode
          .getAttributes()
          .getNamedItem("text")
          .getNodeValue()
          .toString() +
         " High: " + forecastNode
             .getAttributes()
             .getNamedItem("high")
             .getNodeValue()
             .toString() +
         " Low: " + forecastNode
             .getAttributes()
             .getNamedItem("low")
             .getNodeValue()
             .toString() + "\n";
      }
     }else{
      myWeather.numberOfForecast = "No forecast";
     }
     
     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(MainActivity.this,
        e1.toString(), Toast.LENGTH_LONG).show(); 
     } catch (SAXException e) {
      e.printStackTrace();
      Toast.makeText(MainActivity.this,
        e.toString(), Toast.LENGTH_LONG).show(); 
     } catch (IOException e) {
      e.printStackTrace();
      Toast.makeText(MainActivity.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(MainActivity.this,
        e.toString(), Toast.LENGTH_LONG).show(); 
     } catch (IOException e) {
      e.printStackTrace();
      Toast.makeText(MainActivity.this,
        e.toString(), Toast.LENGTH_LONG).show(); 
     }
     
     return qResult; 
    }
    
}

Download the files.

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