Geocoder.java

package uni.projecte.maps.geocoding;

import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;



public class Geocoder 

{
	static String country="";

	
	public static String reverseGeocode(double latitude,double longitude)
	{
	    //http://maps.google.com/maps/geo?q=40.714224,-73.961452&output=json&oe=utf8&sensor=true_or_false&key=your_api_key
		String localityName = "";
	    HttpURLConnection connection = null;
	    URL serverAddress = null;

	    try 
	    {
	        // build the URL using the latitude & longitude you want to lookup
	        // NOTE: I chose XML return format here but you can choose something else

	        serverAddress = new URL("http://maps.googleapis.com/maps/api/geocode/xml?latlng=" + Double.toString(latitude) + "," + Double.toString(longitude) +
		        		"&sensor=true");

	        //set up out communications stuff
	        connection = null;
		      
	        //Set up the initial connection
			connection = (HttpURLConnection)serverAddress.openConnection();
			connection.setRequestMethod("GET");
			connection.setDoOutput(true);
			connection.setReadTimeout(10000);
		                  
			connection.connect();
		    
			try
			{
				InputStreamReader isr = new InputStreamReader(connection.getInputStream());
				InputSource source = new InputSource(isr);
				SAXParserFactory factory = SAXParserFactory.newInstance();
				SAXParser parser = factory.newSAXParser();
				XMLReader xr = parser.getXMLReader();
				GoogleReverseGeocodeXmlHandler handler = new GoogleReverseGeocodeXmlHandler();
				
				xr.setContentHandler(handler);
				xr.parse(source);
				
				localityName = handler.getLocalityName();
				country=handler.getCountry();
			}
			catch (Exception ex)
			{
				ex.printStackTrace();
			}
			
	    }
	    catch (Exception ex)
	    {
	        ex.printStackTrace();
	    }
	    
	    return localityName+":"+country;
	}
}