russiamidlet.java

J2ME程序设计实例教程的源码

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

public class RussiaMIDlet extends MIDlet implements CommandListener {
    private RussiaCanvas russia;
    private Command cmdExit = new Command("退出", Command.EXIT, 1);
    private Command cmdStart = new Command("开始", Command.SCREEN, 2);
    private Command cmdPause = new Command("暂停", Command.SCREEN, 2);
    
    public RussiaMIDlet() {
        russia = new RussiaCanvas(this);
        russia.setCommandListener(this);
    }
    
    public void startApp() {
        Display display = Display.getDisplay(this);
        russia.addCommand(cmdExit);
        russia.addCommand(cmdStart);
        display.setCurrent(russia);
    }
    
    public void pauseApp() {
        setStartMenu();
        russia.pause();
    }
    
    public void destroyApp(boolean unconditional) {
    }
    
    public void commandAction(Command cmd, Displayable d) {
        if(cmd == cmdExit) {
            destroyApp(false);
            notifyDestroyed();
        }
        else if(cmd == cmdStart) {
            russia.removeCommand(cmdStart);
            russia.addCommand(cmdPause);
            russia.start();
        }
        else if(cmd == cmdPause) {
            pauseApp();
        }
    }
    
    public void setStartMenu() {
        russia.removeCommand(cmdPause);
        russia.addCommand(cmdStart);
    }
}