Problem using JSR-179

**yasirmx** · 2010-01-06, 11:52

Hello,

I'm trying to use several codes to find latitude and longitude and concatenate them using a string but each time i get the following error message:

D:\Dissertation\Software\MobileApplication1\src\FindingPosition.java:121: cannot find symbol
symbol : method append(double)
location: class java.lang.StringBuffer
string = "\nLatitude : " + lat + "\nLongitude : " + lon;
Fatal Error: Unable to find method append
D:\Dissertation\Software\MobileApplication1\nbproject\build-impl.xml:389: Compile failed; see the compiler error output for details.
BUILD FAILED (total time: 0 seconds)

source code is:

Code:

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.StringItem;
import javax.microedition.location.Coordinates;
import javax.microedition.location.Criteria;
import javax.microedition.location.Location;
import javax.microedition.location.LocationException;
import javax.microedition.location.LocationProvider;
import javax.microedition.midlet.MIDlet;

public class FindingPosition extends MIDlet implements CommandListener {

    private Display display;
    private Form form;
    private Command exitCommand;
    private Command refreshCommand;
    private StringItem text;
    
    private Location location;
    private LocationProvider locationProvider;
    private Coordinates coordinates;
    private Criteria criteria;

    /**
     * Constructor. Constructs the object and initializes displayables.
     */
    public FindingPosition() {
        form = new Form("Finding location.");

        exitCommand = new Command("Exit", Command.EXIT, 2);
        refreshCommand = new Command("Refresh", Command.OK, 1);

        text = new StringItem("Your position:", "\nPress \"Refresh\"");
        form.append(text);

        form.addCommand(exitCommand);
        form.addCommand(refreshCommand);
        form.setCommandListener(this);

        display = Display.getDisplay(this);
        display.setCurrent(form);

        criteria = new Criteria();
        criteria.setHorizontalAccuracy(500);
        
        try {
            locationProvider = LocationProvider.getInstance(criteria);
        } catch (LocationException e) {
            //TODO: Handle location exception.
            return;
        }
    }

    /**
     * From MIDlet.
     * Called when the MIDlet is started.
     */
    public void startApp() {
        // No implementation required.
    }

    /**
     * From MIDlet.
     * Called to signal the MIDlet to enter the Paused state.
     */
    public void pauseApp() {
        // No implementation required.
    }

    /**
     * From MIDlet.
     * Called to signal the MIDlet to terminate.
     * @param unconditional whether the MIDlet has to be unconditionally
     * terminated
     */
    public void destroyApp(boolean unconditional) {
        // No implementation required
    }

    /**
     * From CommandListener.
     * Called by the system to indicate that a command has been invoked on a
     * particular displayable.
     * @param cmd the command that was invoked
     * @param displayable the displayable where the command was invoked
     */
    public void commandAction(Command c, Displayable d) {
        if (c == refreshCommand) {
            checkLocation();
        } else if (c == exitCommand) {
            notifyDestroyed();
        }
    }

    /**
     * Called to read current location.
     */
    private void checkLocation() {
        String string;
        
        try {
            location = locationProvider.getLocation(60);
        } catch (Exception e) {
            //TODO: Handle exception.
            return;
        }
        
        coordinates = location.getQualifiedCoordinates();
       
        if (coordinates != null)
        {
            // Use coordinate information 
            double lat =  coordinates.getLatitude();
            
            double lon =  coordinates.getLongitude();
            
            string = "\nLatitude : " + lat + "\nLongitude : " + lon;
        } 
        else
        {
            string = "Location API failed";
        }
        text.setText(string);
    }
}

Besiddes each time I cast the double to long (as mentioned below) compiler says:

Code:

 long lat =  (long) coordinates.getLatitude();
            
            long lon =  (long) coordinates.getLongitude();

Error msg:

Error preverifying class FindingPosition
java/lang/VerifyError:
D:\Dissertation\Software\MobileApplication1\nbproject\build-impl.xml:461: Preverification failed with error code 1.

cleaned and built but same results but if i create a new project and use the same class, it is built successfulluy but phone says invalid jar file

**grahamhughes** · 2010-01-06, 12:08