import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import javax.microedition.location.*;

public class CoordinateAlert extends MIDlet implements CommandListener {
	
  private Display display;	
  private Form mainForm;
  private Alert positionAlert;
  
  public CoordinateAlert() {
  	
    mainForm = new Form("HelloMIDlet");
    mainForm.append(new StringItem(null, "You will be alerted of your current position."));
    
    mainForm.addCommand(new Command("Exit", Command.EXIT, 0));
    mainForm.addCommand(new Command("OK", Command.OK, 1));
    mainForm.setCommandListener(this);
  }
  
  public void startApp() {
    display = Display.getDisplay(this);
    display.setCurrent(mainForm);
  }
  
  public void pauseApp() {}
  
  public void destroyApp(boolean unconditional) {}
  
  public void commandAction(Command c, Displayable s) {
  	
  	String label = c.getLabel();
    if (label.equals("Exit")) {

    	notifyDestroyed();
    }
    else if (label.equals("OK")) {
    	
    	mainForm.set(0, new StringItem(null, "Tracking location ..."));
    	givePositionAlert ();
    	mainForm.set(0, new StringItem(null, "Again get alerted of your current position?"));
    }
  }
  
  private void givePositionAlert () {
  	
  	try {
		
		Criteria cr = new Criteria();
		cr.setHorizontalAccuracy(500);
		
		LocationProvider lp = LocationProvider.getInstance(cr);
		Location l = lp.getLocation(60);
		
		Coordinates c = l.getQualifiedCoordinates();		
		if (c != null) {
		   
			String lat = c.convert(c.getLatitude(),c.DD_MM);
			if (c.getLatitude() > 0) {
			
				lat = "E " + lat;
			}
			else {
			
				lat = "W " + lat;
			}
			
			String lon = c.convert(c.getLongitude(),c.DD_MM);
			if (c.getLatitude() > 0) {
			
				lon = "N " + lon;
			}
			else {
			
				lon = "S " + lon;
			}
			
			positionAlert = new Alert("Location Alert");
			positionAlert.setString("\nYour present location is \n" + lat + "\n" + lon);
			positionAlert.setTimeout(Alert.FOREVER);
		}
		else {
			
			positionAlert = new Alert("Location Error");
			positionAlert.setString("Null Coordinate Received");
			positionAlert.setTimeout(Alert.FOREVER);
		}
	} 
	catch (Exception e) { //LocationException OR InterruptedException
		
		positionAlert = new Alert("Location Error");
		positionAlert.setString("Exception Encountered " + e);
		positionAlert.setTimeout(Alert.FOREVER);
	}
	display.setCurrent(positionAlert); 
  }
}