端到端J2ME应用开发实例——介绍Smart Ticket

public class UIController {
  // Action methods ...
  public void chooseMovieRequested() {
    runWithProgress(
      new EventDispatcher(
        EventIds.EVENT_ID_CHOOSEMOVIEREQUESTED, 
            mainMenuUI), 
                getString(UIConstants.PROCESSING), false);
  }
  // Action methods ...
  public void runWithProgress(Thread thread, String title, 
                              boolean stoppable) {
    progressObserverUI.init(title, stoppable);
    getDisplay().setCurrent(progressObserverUI);
    thread.start();
  }
  class EventDispatcher extends Thread {
    // ...
    public void run() {
      // Switch -- case statements to delegate
      // actions to the model layer
    }
  }
}
public class ProgressObserverUI extends Form 
            implements ProgressObserver,
            CommandListener {
  private UIController uiController;
  private static final int GAUGE_MAX = 8;
  private static final int GAUGE_LEVELS = 4;
  int current = 0;
  Gauge gauge;
  Command stopCommand;
  boolean stoppable;
  boolean stopped;
  public ProgressObserverUI(UIController uiController) {
    super("");
    gauge = new Gauge("", false, GAUGE_MAX, 0);
    stopCommand = new 
        Command(uiController.getString(UIConstants.STOP), 
            Command.STOP, 10);
    append(gauge);
    setCommandListener(this);
  }
  public void init(String note, boolean stoppable) {
    gauge.setValue(0);
    setNote(note);
    setStoppable(stoppable);
    stopped = false;
  }
  public void setNote(String note) {
    setTitle(note);
  }
  public boolean isStoppable() {
    return stoppable;
  }
  public void setStoppable(boolean stoppable) {
    this.stoppable = stoppable;
    if (stoppable) {
      addCommand(stopCommand);
    } else {
      removeCommand(stopCommand);
    }
  }
  /**
   * Indicates whether the user has stopped the progress.
   * This message should be called before calling update.
   */
  public boolean isStopped() {
    return stopped;
  }
  public void updateProgress() {
    current = (current + 1) % GAUGE_LEVELS;
    gauge.setValue(current * GAUGE_MAX / GAUGE_LEVELS);
  }
  public void commandAction(Command c, Displayable d) {
    if (c == stopCommand) {
      stopped = true;
    }
  }
}