// SimpleGPSTest2 -- a program that tests your GPS using the Java ME Location API
// By Thomas Padron-McCarthy (padrone@lysator.liu.se)
// Latest change to this file: March 31, 2009
// No copyright. No warranty. No nothing. Share and enjoy!

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

public class SimpleGPSTest2 extends MIDlet implements CommandListener {
    private Display display;
    private Form form = new Form("Simple GPS Test");
    private Command get_lp_command = new Command("Get LP", "Get Location Provider", Command.SCREEN, 1);
    private Command get_location_command = new Command("Get Location", Command.SCREEN, 0);
    private Command get_coordinates_command = new Command("Get Coordinates", Command.SCREEN, 1);
    private Command exit_command = new Command("Exit", Command.EXIT, 2);

    public SimpleGPSTest2() { }

    public void destroyApp(boolean unconditional) { }

    public void pauseApp() { }

    public void startApp() {
        display = Display.getDisplay(this);
        display.setCurrent(form);

        form.addCommand(get_lp_command);
        form.addCommand(get_location_command);
        form.addCommand(get_coordinates_command);
        form.addCommand(exit_command);
        form.setCommandListener(this);

        display.setCurrent(form);
    }

    public void commandAction(Command c, Displayable s) {
        if (c == exit_command) {
            destroyApp(true);
            notifyDestroyed();
        }
        else if (c == get_lp_command) {
            get_lp();
        }
        else if (c == get_location_command) {
            get_location();
        }
        else if (c == get_coordinates_command) {
            get_coordinates();
        }
        else {
            Alert alert = new Alert("Internal error", "This can't happen!", null, null);
            alert.setTimeout(Alert.FOREVER);
            display.setCurrent(alert);
        }
    } // commandAction

    private LocationProvider lp;

    private void get_lp() {
        try {
            lp = LocationProvider.getInstance(null);
            StringItem item = new StringItem("Location Provider: ", "" + lp);
            form.append(item);
        }
        catch(LocationException e) {
            Alert alert = new Alert("LocationException",
                                    "There was a location problem when trying to get a location provider: " + e,
                                    null, null);
            alert.setTimeout(Alert.FOREVER);
            display.setCurrent(alert);
        }
        catch(Throwable e) {
            Alert alert = new Alert("Throwable", "Some other, unexpected problem occured when trying to get a location provider: " + e,
                                    null, null);
            alert.setTimeout(Alert.FOREVER);
            display.setCurrent(alert);
        }
    }

    private Location location;

    private void get_location() {
        if (lp == null) {
            Alert alert = new Alert("Wrong!", "You need to get a location provider before you can get a location.",
                                    null, null);
            alert.setTimeout(Alert.FOREVER);
            display.setCurrent(alert);
        }
        else {
            Runnable r = new Runnable() {
                    public void run() {

                        try {
                            StringItem waiting_item = new StringItem("Trying to get a location...", "");
                            form.append(waiting_item);
                            location = lp.getLocation(-1);
                            StringItem location_item = new StringItem("Location: ", "" + location);
                            form.append(location_item);
                            StringItem valid_item = new StringItem("Location isValid(): ", "" + location.isValid());
                            form.append(valid_item);
                        }
                        catch(LocationException e) {
                            Alert alert = new Alert("LocationException",
                                                    "There was a location problem when trying to get a location: " + e,
                                                    null, null);
                            alert.setTimeout(Alert.FOREVER);
                            display.setCurrent(alert);
                        }
                        catch(InterruptedException e) {
                            Alert alert = new Alert("InterruptedException", "Reached timeout when trying to get a location: " + e,
                                                    null, null);
                            alert.setTimeout(Alert.FOREVER);
                            display.setCurrent(alert);
                        }
                        catch(SecurityException e) {
                            Alert alert = new Alert("SecurityException", "You weren't allowed to get a location: " + e,
                                                    null, null);
                            alert.setTimeout(Alert.FOREVER);
                            display.setCurrent(alert);
                        }
                        catch(Throwable e) {
                            Alert alert = new Alert("Throwable", "Some other, unexpected problem occured when trying to get a location: " + e,
                                                    null, null);
                            alert.setTimeout(Alert.FOREVER);
                            display.setCurrent(alert);
                        }

                    } // run
                }; // Runnable
            Thread t = new Thread(r);
            t.start();
        }
    } // get_location

    private void get_coordinates() {
        if (location == null) {
            Alert alert = new Alert("Wrong!", "You need to get a location before you can get the coordinates.",
                                    null, null);
            alert.setTimeout(Alert.FOREVER);
            display.setCurrent(alert);
        }
        else if (location.isValid() == false) {
            Alert alert = new Alert("Wrong!", "You need to get a valid location before you can get the coordinates.",
                                    null, null);
            alert.setTimeout(Alert.FOREVER);
            display.setCurrent(alert);
        }
        else {
            QualifiedCoordinates qc = location.getQualifiedCoordinates();
            double latitude = qc.getLatitude();
            double longitude = qc.getLongitude();
            double accuracy = qc.getHorizontalAccuracy();

            StringItem latitude_item = new StringItem("Latitude: ", "" + latitude);
            form.append(latitude_item);
            StringItem longitude_item = new StringItem("Longitude: ", "" + longitude);
            form.append(longitude_item);
            StringItem accuracy_item = new StringItem("Accuracy: ", "" + accuracy);
            form.append(accuracy_item);
        }
    } // get_coordinates

} // SimpleGPSTest2