J2me 入门路之---media 2

package com.sa.media;

import java.io.IOException;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.List;
import javax.microedition.media.Manager;
import javax.microedition.media.MediaException;
import javax.microedition.media.Player;
import javax.microedition.media.control.ToneControl;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class MediaMIDlet extends MIDlet implements CommandListener {
private Display display;
private List list;
private Command cmd_Exit = new Command("Exit", Command.EXIT, 2);
private Command cmd_Play = new Command("Play", Command.ITEM, 1);

public MediaMIDlet() {
display = Display.getDisplay(this);
list = new List("media demo", List.IMPLICIT);
}

protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
// TODO Auto-generated method stub

}

protected void pauseApp() {
// TODO Auto-generated method stub

}

protected void startApp() throws MIDletStateChangeException {
// TODO Auto-generated method stub
list.addCommand(cmd_Exit);
list.addCommand(cmd_Play);
list.setCommandListener(this);
display.setCurrent(list);
}

public void commandAction(Command c, Displayable arg1) {
// TODO Auto-generated method stub
if (c == cmd_Exit) {
try {
destroyApp(false);
} catch (MIDletStateChangeException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
notifyDestroyed();
}
if (c == cmd_Play) {
play();
}
}

private void play() {
byte tempo = 30; // 节拍设置为120beats/min
byte d = 8; // 8分音符
byte C4 = ToneControl.C4;
byte D4 = (byte)(C4 + 2); // 全音程
byte E4 = (byte)(C4 + 4); // 大3调
byte G4 = (byte)(C4 + 7); // 5调
byte rest = ToneControl.SILENCE; // 休止符
byte[] mySequence = {
ToneControl.VERSION, 1, // version 1
ToneControl.TEMPO, tempo, // 设置empo
ToneControl.BLOCK_START, 0, //A部分开始定义
E4,d, D4,d, C4,d, E4,d,
E4,d, E4,d, E4,d, rest,d,
ToneControl.BLOCK_END, 0, // A部分结束定义
ToneControl.PLAY_BLOCK, 0, // 演奏A部分
D4,d, D4,d, D4,d, rest,d, // 演奏B
E4,d, G4,d, G4,d, rest,d,
ToneControl.PLAY_BLOCK, 0, // 重复演奏A部分
D4,d, D4,d, E4,d, D4,d, C4,d // 演奏C部分
};
try{
Player p = Manager.createPlayer(Manager.TONE_DEVICE_LOCATOR);
p.realize();
ToneControl c = (ToneControl)p.getControl("ToneControl");
c.setSequence(mySequence); //设置音调序列
for(int i = 0;i<4;i++){
p.start(); //开始播放音乐
}
} catch (IOException ioe) {
} catch (MediaException me) { }
}
}



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