AWT start/stop bundle buttons Help needed.

Question

Hello,
I need help getting start/stop buttons on my AWT Class to take the action of methods from an other class. I will give anybody who can figure this out ALL OF MY Duke Dollars. (I shortend it up to the important stuff so that there isn't too much to read):
MY PROBLEM: I need to have my Gui user interface to start up first. Then when somebody clicks the Gui class "start" button, it will call the start method of my Activator class and similiarly for the "stop" button. When I run the program, it starts up already in "start" mode. It should start up without getting the service (stop mode) and then get it once "start" is pressed" Hopefully somebody can help me figure this out.
First, I have the following AWT class
public class Gui extends Frame{
      Frame f;
      MyImage imagePanel;
      Button button_start;
      Button button_stop;
      Label statusBar;
      Panel btns;
    public Gui() {
        addWindowListener(new WinClosing());
        setLayout(new BorderLayout());
        imagePanel = new MyImage();
        btns = new Panel();
        button_start  = new Button("START");
        button_stop  = new Button("STOP");
        btns.add(button_start);
        btns.add(button_stop);
        add("North", btns);
        add("Center",imagePanel);       
        button_start.addActionListener(new ActionListener(){     
            public void actionPerformed( ActionEvent e ){
                imagePanel.getImage();
        button_stop.addActionListener(new ActionListener(){     
            public void actionPerformed( ActionEvent e ){
            imagePanel.closeImage();}
        });          }Then I have the Activator class:
public class Activator implements BundleActivator {
     public ServiceReference reference;
     public void start(BundleContext bc) {
         reference = bc.getServiceReference(GpsService.SERVICE_NAME);
         if (reference == null) {
         System.out.println("User could not get a service.");
          } else {
         AnyService anything = (AnyService) bc.getService(reference);
                UserClass user = new UserClass();
                user.startup(anything);
public void stop(BundleContext bc) {
    if (reference != null) {
    bc.ungetService(reference);
    reference = null;
    System.out.println("User has released its Service.");
    } }}Then this previous class calls the startup method for this class:
public class Driver {
        public void startup(AnyService any){
        double any  = any.getValue();
        System.out.println(any);
        Gui g = new Gui(any);
        g.setSize(714, 480);
        g.setVisible(true); 
      }}Thanks in advance!

Answer 1

Hmm, it's quite hard to imagine what's going on without the code for MyImage. However, I guess you need to add an ActionListener to your two buttons. Are you sure you need two buttons, though? Presumably you can't stop until you've started and vice versa?
private Activator activator;
private Button startButton;
private Button stopButton
public Gui()
  startButton = new Button("Start");
  stopButton = new Button("Stop");
  stopButton.setEnabled(false);
  startButton.addActionListener(new ActionListener()
    public void actionPerformed(ActionEvent e)
      start();
  stopButton.addActionListener(new ActionListener()
    public void actionPerformed(ActionEvent e)
      stop();
private synchronized void start()
  // Construct the Activator when we need it
  if(activator == null)
    activator = new Activator();
  activator.start(...); // Don't know where you get your BundleContext from!
  startButton.setEnabled(false);
  stopButton.setEnabled(true);
private synchronized void stop()
  activator.stop(...); // Don't know where you get your BundleContext from!
  startButton.setEnabled(true);
  stopButton.setEnabled(false);
}I'm assuming here that once the Activator is "started" is stays started until it is told to stop, ie, it doesn't stop itself after a finite amount of time.
Hope this helps.