playsimpletone_2.java

《精通JAVA手机游戏与应用程序设计》随书光盘

import java.io.IOException;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.media.*;
import javax.microedition.media.control.*;

public class PlaySimpleTone_2
 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);
	private Command stopCommand = new Command("Stop", Command.ITEM, 1);

	byte tempo = 30; // set tempo to 120 bpm 
    byte d = 8;      // eighth-note 

    byte C4 = ToneControl.C4;; 
    byte D4 = (byte)(C4 + 2); // a whole step 
    byte E4 = (byte)(C4 + 4); // a major third 
    byte G4 = (byte)(C4 + 7); // a fifth 
    byte rest = ToneControl.SILENCE; // rest 

    byte[] mySequence = {
        ToneControl.VERSION, 1,   // version 1
        ToneControl.TEMPO, tempo, // set tempo
        ToneControl.BLOCK_START, 0,   // start define "A" section
        E4,d, D4,d, C4,d, E4,d,       // content of "A" section
        E4,d, E4,d, E4,d, rest,d,           
        ToneControl.BLOCK_END, 0,     // end define "A" section
        ToneControl.PLAY_BLOCK, 0,    // play "A" section
        D4,d, D4,d, D4,d, rest,d,     // play "B" section
        E4,d, G4,d, G4,d, rest,d,
        ToneControl.PLAY_BLOCK, 0,    // repeat "A" section
        D4,d, D4,d, E4,d, D4,d, C4,d  // play "C" section
    }; 
    private Player p=null;
	
	
	public PlaySimpleTone_2() {
		display = Display.getDisplay(this);
		list = new List("播放曲调例子", List.IMPLICIT);
	}

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

		display.setCurrent(list);
		
		try{ 
	        p = Manager.createPlayer(Manager.TONE_DEVICE_LOCATOR); 
	        p.realize(); 
	        ToneControl c = (ToneControl)p.getControl("ToneControl"); 
	        c.setSequence(mySequence); 
	        p.start(); 
	    } catch (IOException ioe) { 
	    } catch (MediaException me) { }

	}

	public void destroyApp(boolean unconditional) {
	}

	public void pauseApp() {
	}

	public void commandAction(Command c, Displayable s) {
		if (c == exitCommand) {
			if(p!= null)
				p.close();
			
			destroyApp(false);
			notifyDestroyed();
		}
		if (c == playCommand) {
			if(p!= null){
				try{
					p.start();
				}catch (MediaException me) { }
			}	
			list.removeCommand(playCommand);
			list.addCommand(stopCommand);
			display.setCurrent(list);
		}
		if (c == stopCommand) {
			if(p!= null){
				try{
					p.stop();
				}catch (MediaException me) { }
			}	
			list.removeCommand(stopCommand);
			list.addCommand(playCommand);
			display.setCurrent(list);
		}
	}

	
}