Android Open Source - InfoWallpaper Weather Handler

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License

The source code is released under:
MIT License
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Java Source Code

package com.andreashedin.infowallpaper;
// w w w  .j ava  2 s  .c  o  m
import java.io.IOException;
import java.io.StringReader;
import java.util.Calendar;
import java.util.Date;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;

import android.util.Log;

public class WeatherHandler {

  private final static WeatherHandler sInstance = new WeatherHandler();
  private static final String WEATHER_URL = "http://www.google.com/ig/api?weather=%s";
  public static final int MAX_DAYS = 4;

  private String mLastSuccessfulLocation = "";
  private String mLocation = "";
  private WeatherData[] mWeatherData = new WeatherData[MAX_DAYS];
  private boolean mUseFahrenheit = true;
  private String mIconSet = "light_frame_%s.png";
  private int mIconSize = 100;
  private int mUpdateMinutes = -1;
  private Date mLastUpdate = null;
  private boolean mForce = false;
  
  private WeatherHandler() {
    for(int i = 0; i < MAX_DAYS; ++i)
      mWeatherData[i] = null;
  }

  public static WeatherHandler instance() {
    return sInstance;
  }
  
  public boolean useIcons() {
    return (mIconSize > 0);
  }
  
  public boolean useFahrenheit() {
    return mUseFahrenheit;
  }
  
  public void useFahrenheit(boolean use) {
    mUseFahrenheit = use;
  }
  
  public void updateMinutes(int minutes) {
    mUpdateMinutes = minutes;
  }
  
  public void setLocation(String loc) {
    mLocation = loc;
  }
  
  public String getIconSet() {
    return mIconSet;
  }
  
  public void setIconSet(String set) {
    mIconSet = set;
  }
  
  public int getIconSize() {
    return mIconSize;
  }
  
  public void setIconSize(int iconSize) {
    mIconSize = iconSize;
  }
  
  public int updateMinutes() {
    return mUpdateMinutes;
  }

  public WeatherData getData(int day) {
    if (day >= MAX_DAYS || day < 0)
      return null;

    return mWeatherData[day];
  }
  
  public boolean shouldUpdate() {
    boolean update = (mForce || (Calendar.getInstance().getTime().getTime() - mLastUpdate.getTime()) > updateMinutes());
    mForce = false;
    
    return update;
  }
  
  public void forceUpdate(boolean force) {
    mForce = force;
  }
  
  public boolean forceUpdate() {
    return mForce;
  }

  public void update(String userAgent) {
    if (userAgent == null || userAgent.length() == 0 || mLocation.length() == 0)
      return;

    String loc = mLocation.replace(" ", "%20");
    
    String content = LiveInfoWallpaper.getUrlContent(String.format(WEATHER_URL, loc), userAgent);

    if (content.length() > 0) {
      mLastUpdate = Calendar.getInstance().getTime();
      parseWeatherInformation(content);
    }
    
    for (int i = 0; i < MAX_DAYS; ++i) {
      if(mWeatherData[i] == null)
        continue;
      
      if (mUseFahrenheit == true)
        mWeatherData[i].fahrenheit = true;
      else
        mWeatherData[i].fahrenheit = false;
    }
  }

  private void parseWeatherInformation(String weather) {

    int day = 0;
    boolean foundData = false;
    
    try {
      XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
      factory.setNamespaceAware(true);
      XmlPullParser xpp = factory.newPullParser();

      xpp.setInput(new StringReader(weather));
      int eventType = xpp.getEventType();
      while (eventType != XmlPullParser.END_DOCUMENT) {
        if (eventType == XmlPullParser.START_TAG) {
          if (xpp.getName().compareTo("city") == 0) {
            mLocation = xpp.getAttributeValue(0);
            mLastSuccessfulLocation = mLocation;
          } else if (xpp.getName().compareTo("current_conditions") == 0) {
            foundData = true;
            parseCurrentConditions(xpp);
          } else if (xpp.getName().compareTo("forecast_conditions") == 0) {
            foundData = true;
            parseForecastConditions(xpp, day);
            ++day;
          }
        }

        eventType = xpp.next();
      }
    } catch (Exception ex) {

    }
    
    if(foundData == false)
      mLocation = mLastSuccessfulLocation;
  }

  private void parseForecastConditions(XmlPullParser xpp, int day)
      throws XmlPullParserException, IOException {
    if(mWeatherData[day] == null)
      mWeatherData[day] = new WeatherData();

    while (true) {
      if (xpp.getEventType() == XmlPullParser.START_TAG) {
        if (xpp.getName().compareTo("low") == 0) {
          mWeatherData[day].lowF = Integer.parseInt(xpp
              .getAttributeValue(0));
        } else if (xpp.getName().compareTo("high") == 0) {
          mWeatherData[day].highF = Integer.parseInt(xpp
              .getAttributeValue(0));
        } else if (xpp.getName().compareTo("condition") == 0) {
          if(day > 0)
            mWeatherData[day].condition = xpp.getAttributeValue(0);
        }
      } else if (xpp.getEventType() == XmlPullParser.END_TAG) {
        if (xpp.getName().compareTo("forecast_conditions") == 0)
          return;
      }

      xpp.next();
    }
  }

  private void parseCurrentConditions(XmlPullParser xpp)
      throws XmlPullParserException, IOException {
    if(mWeatherData[0] == null)
      mWeatherData[0] = new WeatherData();

    while (true) {
      if (xpp.getEventType() == XmlPullParser.START_TAG) {
        if (xpp.getName().compareTo("temp_f") == 0) {
          mWeatherData[0].tempF = Integer.parseInt(xpp
              .getAttributeValue(0));
        } else if (xpp.getName().compareTo("condition") == 0) {
          mWeatherData[0].condition = xpp.getAttributeValue(0);
        }
      } else if (xpp.getEventType() == XmlPullParser.END_TAG) {
        if (xpp.getName().compareTo("current_conditions") == 0)
          return;
      }

      xpp.next();
    }
  }
  
  public String getLocation() {
    return mLocation;
  }

  public class WeatherData {
    public String condition = "";
    public String originalCondition = "";
    public int tempF = 0;
    public int highF = 0;
    public int lowF = 0;
    public boolean fahrenheit = true;

    public String getTemp() {
      String temp = "";
      if (fahrenheit) {
        temp = "" + tempF;
      } else {
        float t = ((float)(tempF - 32)) * 5.0f / 9.0f;
        if(t < 0)
          t -= 0.5f;
        else
          t += 0.5f;
        
        int tempC = (int)t;
        temp = "" + tempC;
      }

      return temp;
    }

    public String getCondition() {
      return condition;
    }

    public String getHighTemp() {
      String temp = "";
      if (fahrenheit) {
        temp = "" + highF;
      } else {
        float t = ((float)(highF - 32)) * 5.0f / 9.0f;
        if(t < 0)
          t -= 0.5f;
        else
          t += 0.5f;
        
        int tempC = (int)t;
        temp = "" + tempC;
      }

      return temp;
    }

    public String getLowTemp() {
      String temp = "";
      if (fahrenheit) {
        temp = "" + lowF;
      } else {
        float t = ((float)(lowF - 32)) * 5.0f / 9.0f;
        if(t < 0)
          t -= 0.5f;
        else
          t += 0.5f;
        
        int tempC = (int)t;
        temp = "" + tempC;
      }

      return temp;
    }
  }
}
Java Source Code List
