Aplicación de JAVA MOBILE

package dn;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.SAXException;

/**
 * Local Search Midlet
 *
 * @author Deepak Nadig
 */
public class LocalSearch extends MIDlet implements CommandListener
{
    String debug = "none";
   
    Display display;

    Form mainForm;
   
    Form aboutForm;
   
    Form resultsForm;

    Form rawResultsForm;

    String appIDLabel = "AppID";

    String queryLabel = "Query";

    String resultsLabel = "Results";

    String startLabel = "Start";

    String zipLabel = "ZIP";

    String appID = "YahooDemo";

    String query = "pizza";

    String results = "2";

    String start = "1";

    String zip = "95135";

    Command searchCommand;

    Command rawResultsCommand;

    Command backCommand;

    Command exitCommand;
   
    Command aboutCommand;
   
    LocalSearchResponseHandler lsrh;

    /**
     * 
     */
    public LocalSearch()
    {
        display = Display.getDisplay(this);

        // Commands. Son los botones que se agregan al menu del celular
        exitCommand = new Command("Exit", Command.EXIT, 0);
        searchCommand = new Command("Search", Command.SCREEN, 2);
        backCommand = new Command("Back", Command.BACK, 0);
        rawResultsCommand = new Command("Raw", Command.SCREEN, 2);
        aboutCommand = new Command("About", Command.HELP, 2);

        // Main form
        mainForm = new Form("Local Search");

        mainForm.append("Local Search");

        mainForm.append(new TextField(appIDLabel, appID, 40, TextField.ANY));
        mainForm.append(new TextField(queryLabel, query, xTextField.ANY));
        mainForm.append(new TextField(resultsLabel, results, 4,
                TextField.NUMERIC));
        mainForm.append(new TextField(startLabel, start, 4, TextField.NUMERIC));
        mainForm.append(new TextField(zipLabel, zip, 5, TextField.NUMERIC));

        mainForm.addCommand(exitCommand);
        mainForm.addCommand(searchCommand);
        mainForm.addCommand(aboutCommand);

        mainForm.setCommandListener(this);
       
        // Search results form
        resultsForm = new Form("Formatted");

        resultsForm.addCommand(rawResultsCommand);
        resultsForm.addCommand(exitCommand);
        resultsForm.addCommand(backCommand);

        resultsForm.setCommandListener(this);

        // Raw results form
        rawResultsForm = new Form("Raw");

        rawResultsForm.addCommand(exitCommand);
        rawResultsForm.addCommand(backCommand);

        rawResultsForm.setCommandListener(this);

        // About form
        aboutForm = new Form("About");

        aboutForm.addCommand(backCommand);

        aboutForm.setCommandListener(this);
    }

// Primer evento que se ejecuta al inicio del sistema
    protected void startApp() throws MIDletStateChangeException
    {
        display.setCurrent(mainForm);
    }

// Evento que se ejecuta cuando se para la aplicacion
    protected void pauseApp()
    {
    }

// Evento que se ejecuta al cerrar la aplicacion
    public void destroyApp(boolean unconditional)
    {
    }

    private void retrieveFormData(Form form)
    {
        int formSize = form.size();
        for (int i = 0; i < formSize; i++)
        {
            Item item = form.get(i);
            String label = item.getLabel();

            if ((label != null) && (item.getLabel().equals(appIDLabel)))
            {
                appID = ((TextField) item).getString();
            }
            else if ((label != null) && (item.getLabel().equals(queryLabel)))
            {
                query = ((TextField) item).getString();
            }
            else if ((label != null) && (item.getLabel().equals(resultsLabel)))
            {
                results = ((TextField) item).getString();
            }
            else if ((label != null) && (item.getLabel().equals(startLabel)))
            {
                start = ((TextField) item).getString();
            }
            else if ((label != null) && (item.getLabel().equals(zipLabel)))
            {
                zip = ((TextField) item).getString();
            }
        }
    }

// Evento que escucha los eventos, si preciona exit o search el eligue
    public void commandAction(Command c, Displayable s)
    {
        if ((c == exitCommand))
        {
            destroyApp(false);
            notifyDestroyed();
        }
        else if (c == searchCommand)
        {
            String searchResults = null;
            try
            {
                retrieveFormData(mainForm);
                searchResults = doYahooLocalSearch();
            }
            catch (Exception e)
            {
                searchResults = "Exception: " + e.getMessage();
            }

            resultsForm.deleteAll();
            resultsForm.append(searchResults);
            display.setCurrent(resultsForm);
        }
        else if (c == rawResultsCommand)
        {
            rawResultsForm.append(lsrh.toRawString());
            display.setCurrent(rawResultsForm);
        }
        else if (c == backCommand)
        {
            display.setCurrent(mainForm);
        }
        else if (c == aboutCommand)
        {
            aboutForm.append("app_id - application id\nquery - search string\nresults - # of results\nstart - first entry of results\nzip - zip code\n\n\nDN(2005)");
            display.setCurrent(aboutForm);
        }
    }

    private String doYahooLocalSearch() throws IOException
    {
        // Invoke Yahoo Local Search
        String url = "http://api.local.yahoo.com/LocalSearchService/V1/localSearch?"
                + "appid="
                + appID
                + "&"
                + "query="
                + URLUTF8Encoder.encode(query)
                + "&"
                + "results="
                + results
                + "&"
                + "start="
                + start
                + "&"
                + "zip=" + zip;

        return (postViaHttpConnection(url).toFormattedString());
    }
    private LocalSearchResponseHandler postViaHttpConnection(String url) throws IOException
    {
        HttpConnection c = null;
        InputStream is = null;
        OutputStream os = null;
        int rc;

        try
        {
            c = (HttpConnection) Connector.open(url);

            // Set the request method and headers
            c.setRequestMethod(HttpConnection.POST);
            c.setRequestProperty("User-Agent",
                    "Profile/MIDP-2.0 Configuration/CLDC-1.1");
            c.setRequestProperty("Content-Language", "en-US");

            // Getting the response code will open the connection,
            // send the request, and read the HTTP response headers.
            // The headers are stored until requested.
            rc = c.getResponseCode();
            if (rc != HttpConnection.HTTP_OK)
            {
                throw new IOException("HTTP response code: " + rc);
            }

            is = c.openInputStream();

            // Get the ContentType
            String type = c.getType();

            return parseXML(is);
        }
        catch (ClassCastException e)
        {
            throw new IllegalArgumentException("Not an HTTP URL");
        }
        catch (SAXException e)
        {
            throw new IOException("SAX exception");
        }
        finally
        {
            if (is != null)
                is.close();
            if (os != null)
                os.close();
            if (c != null)
                c.close();
        }
    }

    private LocalSearchResponseHandler parseXML(InputStream is) throws SAXException, IOException
    {
        // Get an instance of the SAX parser factory
        SAXParserFactory factory = SAXParserFactory.newInstance();

        // Get an instance of the SAX parser
        SAXParser saxParser = null;
        try
        {
            saxParser = factory.newSAXParser();
        }
        catch (ParserConfigurationException pce)
        {
            throw new IOException(pce.getMessage());
        }

        // Parse the input XML document stream, using my event handler
        lsrh = new LocalSearchResponseHandler();
        saxParser.parse(is, lsrh);

        return lsrh;
    }
}