/* * HelloMIDlet.java * * Created on 2005年4月9日, 下午4:29 */package hello;import javax.microedition.midlet.*;import javax.microedition.lcdui.*;/** * An example MIDlet with simple "Hello" text and an Exit command. * Refer to the startApp, pauseApp, and destroyApp * methods so see how each handles the requested transition. * * @author  Liu Bin * @version */public class HelloMIDlet extends MIDlet implements CommandListener {        private Command exitCommand; // The exit command    private Display display;    // The display for this MIDlet        public HelloMIDlet() {        display = Display.getDisplay(this);        exitCommand = new Command("Exit", Command.SCREEN, 2);    }        /**     * Start up the Hello MIDlet by creating the TextBox and associating     * the exit command and listener.     */    public void startApp() {        TextBox t = new TextBox("Hello MIDlet", "Test string", 256, 0);                t.addCommand(exitCommand);        t.setCommandListener(this);                display.setCurrent(t);    }        /**     * Pause is a no-op since there are no background activities or     * record stores that need to be closed.     */    public void pauseApp() {    }        /**     * Destroy must cleanup everything not handled by the garbage collector.     * In this case there is nothing to cleanup.     */    public void destroyApp(boolean unconditional) {    }        /*     * Respond to commands, including exit     * On the exit command, cleanup and notify that the MIDlet has been destroyed.     */    public void commandAction(Command c, Displayable s) {        if (c == exitCommand) {            destroyApp(false);            notifyDestroyed();        }    }    }