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;
/*w w w  . j a  va  2s  .c  o  m*/
import android.util.Log;

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 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;

/**
 * POI Provider using Picasa service.
 *
 * @author M.Kergall
 * @see https://developers.google.com/picasa-web/docs/2.0/reference
 */
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 {

    final static int MAX_DESC_SIZE = 250;
    double mLat, mLng;
    POI mPOI;
    ArrayList<POI> mPOIs;
    int mTotalResults;
    private String mString;

    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);
    }

    @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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