Android Open Source - SmartNavi Picasa P O I Provider

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License

The source code is released under:

Apache License

Java Source Code

package org.osmdroid.bonuspack.location;
//  ww w. j av  a2s.  c  o  m
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.osmdroid.bonuspack.utils.BonusPackHelper;
import org.osmdroid.bonuspack.utils.HttpConnection;
import org.osmdroid.util.BoundingBoxE6;
import org.osmdroid.util.GeoPoint;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import android.util.Log;

/**
 * POI Provider using Picasa service. 
 * @see https://developers.google.com/picasa-web/docs/2.0/reference
 * @author M.Kergall
 */
public class PicasaPOIProvider {
  
  String mAccessToken;
  
  /**
   * @param accessToken the account to give to the service. Null for public access. 
   * @see https://developers.google.com/picasa-web/docs/2.0/developers_guide_protocol#CreatingAccount
   */
  public PicasaPOIProvider(String accessToken){
    mAccessToken = accessToken;
  }

  private String getUrlInside(BoundingBoxE6 boundingBox, int maxResults, String query){
    StringBuffer url = new StringBuffer("http://picasaweb.google.com/data/feed/api/all?");
    url.append("bbox="+boundingBox.getLonWestE6()*1E-6);
    url.append(","+boundingBox.getLatSouthE6()*1E-6);
    url.append(","+boundingBox.getLonEastE6()*1E-6);
    url.append(","+boundingBox.getLatNorthE6()*1E-6);
    url.append("&max-results="+maxResults);
    url.append("&thumbsize=64c"); //thumbnail size: 64, cropped. 
    url.append("&fields=openSearch:totalResults,entry(summary,media:group/media:thumbnail,media:group/media:title,gphoto:*,georss:where,link)");
    if (query != null)
      url.append("&q="+URLEncoder.encode(query));
    if (mAccessToken != null){
      //TODO: warning: not tested... 
      url.append("&access_token="+mAccessToken);
    }
    return url.toString();
  }
  
  public ArrayList<POI> getThem(String fullUrl){
    Log.d(BonusPackHelper.LOG_TAG, "PicasaPOIProvider:get:"+fullUrl);
    HttpConnection connection = new HttpConnection();
    connection.doGet(fullUrl);
    InputStream stream = connection.getStream();
    if (stream == null){
      return null;
    }
    PicasaXMLHandler handler = new PicasaXMLHandler();
    try {
      SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
      parser.getXMLReader().setFeature("http://xml.org/sax/features/namespaces", false);
      parser.getXMLReader().setFeature("http://xml.org/sax/features/namespace-prefixes", true);
      parser.parse(stream, handler);
    } catch (ParserConfigurationException e) {
      e.printStackTrace();
    } catch (SAXException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
    connection.close();
    if (handler.mPOIs != null)
      Log.d(BonusPackHelper.LOG_TAG, "done:"+handler.mPOIs.size()+" got, on a total of:"+handler.mTotalResults);
    return handler.mPOIs;
  }
  
  /**
   * @param boundingBox
   * @param maxResults
   * @param query - optional - full-text query string. Searches the title, caption and tags for the specified string value.
   * @return list of POI, Picasa photos inside the bounding box. Null if technical issue. 
   */
  public ArrayList<POI> getPOIInside(BoundingBoxE6 boundingBox, int maxResults, String query){
    String url = getUrlInside(boundingBox, maxResults, query);
    return getThem(url);
  }
}

class PicasaXMLHandler extends DefaultHandler {
  
  private String mString;
  double mLat, mLng;
  POI mPOI;
  ArrayList<POI> mPOIs;
  int mTotalResults;
  
  public PicasaXMLHandler() {
    mPOIs = new ArrayList<POI>();
  }
  
  @Override public void startElement(String uri, String localName, String qName,
      Attributes attributes) throws SAXException {
    if (qName.equals("entry")){
      mPOI = new POI(POI.POI_SERVICE_PICASA);
    } else if(qName.equals("media:thumbnail")){
      mPOI.mThumbnailPath = attributes.getValue("url");
    } else if (qName.equals("link")){
      String rel = attributes.getValue("rel");
      if ("http://schemas.google.com/photos/2007#canonical".equals(rel)){
        mPOI.mUrl = attributes.getValue("href");
        mPOI.mUrl = mPOI.mUrl.replaceFirst("https://", "http://");
      }
    }
    mString = new String();
  }
  
  @Override public void characters(char[] ch, int start, int length)
  throws SAXException {
    String chars = new String(ch, start, length);
    mString = mString.concat(chars);
  }

  final static int MAX_DESC_SIZE = 250;
  @Override public void endElement(String uri, String localName, String qName)
  throws SAXException {
    if (qName.equals("gml:pos")) {
      String[] coords = mString.split(" ");
      mLat = Double.parseDouble(coords[0]);
      mLng = Double.parseDouble(coords[1]);
    } else if (qName.equals("gphoto:id")){
      mPOI.mId = Long.parseLong(mString);
    } else if (qName.equals("media:title")){
      mPOI.mType = mString;
    } else if (qName.equals("summary")){
      mPOI.mDescription = mString;
      if (mPOI.mDescription.length()>MAX_DESC_SIZE)
        mPOI.mDescription = mPOI.mDescription.substring(0, MAX_DESC_SIZE)+" (...)";
    } else if (qName.equals("gphoto:albumtitle")){
      mPOI.mCategory = mString;
    } else if (qName.equals("entry")) {
      mPOI.mLocation = new GeoPoint(mLat, mLng);
      mPOIs.add(mPOI);
      mPOI = null;
    } else if (qName.equals("openSearch:totalResults")) {
      mTotalResults = Integer.parseInt(mString);
    }
  }

}

Java Source Code List

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