playsimpletone.java

《精通JAVA手机游戏与应用程序设计》随书光盘

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

public class PlaySimpleTone extends MIDlet implements CommandListener {
	private Player mp;

	private Display display;

	private List list;

	private Command exitCommand = new Command("Exit", Command.EXIT, 2);

	private Command playCommand = new Command("Play", Command.ITEM, 1);

	public PlaySimpleTone() {
		display = Display.getDisplay(this);
		list = new List("音调例子", List.IMPLICIT);
	}

	public void startApp() {
		list.addCommand(exitCommand);
		list.addCommand(playCommand);
		list.setCommandListener(this);

		display.setCurrent(list);
	}

	public void destroyApp(boolean unconditional) {
	}

	public void pauseApp() {
	}

	public void commandAction(Command c, Displayable s) {
		if (c == exitCommand) {
			destroyApp(false);
			notifyDestroyed();
		}
		if (c == playCommand) {
			simpleTone();
		}
	}

	private void simpleTone() {
		try {
			Manager.playTone(ToneControl.C4, 100, 80);
		} catch (Exception ex) {
		}
	}
}