Xletの制御とXlet状態遷移イベントの取得

import java.awt.Graphics;
 
import javax.tv.xlet.Xlet;
import javax.tv.xlet.XletContext;
 
import org.dvb.application.AppID;
import org.dvb.application.AppProxy;
import org.dvb.application.AppStateChangeEvent;
import org.dvb.application.AppStateChangeEventListener;
import org.dvb.application.AppsDatabase;
 
public class Monitor implements Xlet, AppStateChangeEventListener {
    int x=100, y=100;
    Graphics g = null;
    AppProxy ap = null;
    public void initXlet(XletContext context){
        try {
            // アプリケーションデータベースのインスタンスを取得
            AppsDatabase ad = AppsDatabase.getAppsDatabase();
            // 被制御Xletのproxyを取得
            ap = ad.getAppProxy(new AppID(0x7fff0001, 0x4001));
            // 非制御Xletの状態遷移イベントを取得するためのリスナーをセット
            ap.addAppStateChangeEventListener(this);
            // 被制御Xletを起動
            ap.start();
        } catch (Throwable thr){
        }
    }
    public void startXlet(){    }
    public void pauseXlet(){    }
    public void destroyXlet(boolean unconditional){}
    // AppStateChangeEventListnerを実装
    public void stateChange(AppStateChangeEvent arg0) {
        try{
            Thread.sleep(1000);
        } catch (Throwable thr){
        }
        switch ( arg0.getToState() ){
        case AppProxy.STARTED:
            if( arg0.getFromState() == AppProxy.PAUSED ) {
                ap.stop(true); // PAUSED->STARTEDの遷移の後はstop()
            } else {
                ap.pause(); // DESTROYED->STARTEDの遷移の後はpause()
            }
            break;
        case AppProxy.PAUSED:
            ap.resume();
            break;
        case AppProxy.DESTROYED:
            ap.start();
            break;
        default:
        }
        y+=50;
    }
 

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
 
import javax.tv.xlet.Xlet;
import javax.tv.xlet.XletContext;
 
import org.havi.ui.HScene;
import org.havi.ui.HSceneFactory;
import org.havi.ui.HScreen;
 
public class Main implements Xlet{
    int x=100, y=100;
    Graphics g = null;
    public void initXlet(XletContext context){
        try {
            Font font = new Font(null, java.awt.Font.BOLD, 48);
            HScene hs= HSceneFactory.getInstance().getFullScreenScene(
                    HScreen.getDefaultHScreen().getDefaultHGraphicsDevice());
 
            hs.setFont(font);
            hs.setVisible(true);
            g = hs.getGraphics();
            g.setColor(Color.white);
            g.drawString("Initialized", x, y); y+=50;
        } catch (Throwable thr){
        }
    }
    public void startXlet(){
        g.drawString("Started", x, y);y+=50;
    }
    public void pauseXlet(){
        g.drawString("Paused", x, y);y+=50;
    }
    public void destroyXlet(boolean unconditional){
        g.drawString("Destroyed", x, y);y+=50;
    }