media.java

用j2me写的音乐播放器

package my;

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


public class Media extends MIDlet implements CommandListener, ItemStateListener
{
	private Form f;
	private Display display;
	private Command command1,command2,command3;
	private Gauge gauge;    //音量控制
	private VolumeControl vc;  //音量控制
	private Player p;
	public Media() 
	{
		// TODO Auto-generated constructor stub
	    f = new Form("音乐");
	    display = Display.getDisplay(this);
	    command1 = new Command("播放",Command.OK,1);
	    command2 = new Command("停止",Command.STOP,1);
	    command3 = new Command("重放",Command.ITEM ,3);
	    f.addCommand(command1);
	    f.addCommand(command2);
	    f.setCommandListener(this);
	    gauge = new Gauge("音量控制",true,10,5);
	    gauge.setLayout(Item.LAYOUT_CENTER);
	    f.append(gauge);   //在f中添加gauge
	    f.setItemStateListener(this);
	    try
	    {
	         InputStream is = getClass().getResourceAsStream("/mymusic.midi");  //获得音频流
	         p = Manager.createPlayer(is,"audio/midi");      //创建Player对象
		     p.realize(); //准备			
             p.prefetch();
		     vc = (VolumeControl)p.getControl("VideoControl");
		     vc.setLevel(50);
		     p.setLoopCount(2);  //循环播放
	     }catch(Exception e){}
	}

	
	public void commandAction(Command c, Displayable d)
	{
		if(c == command1)
		{
			f.removeCommand(command1);
			f.addCommand(command3);
			try
			{
				p.start();
			}
		    catch(Exception e){};
		}
		if(c == command2)
		{
			if(p!=null)
			{
				try
				{
					p.stop();
				}catch(Exception e){}
			}
		}
		if(c == command3 )
		{
			f.removeCommand(command3);
			f.addCommand(command1);
			try
			{
				p.setMediaTime(-1);
				p.start();
			}catch(Exception e){}
		}
	}

	public void itemStateChanged(Item item)
	{
		int volume = gauge.getValue()*10;
		if(vc!=null)
		{
			vc.setLevel(volume);
		}
	}
	protected void pauseApp(){
	}

	protected void destroyApp(boolean arg0)
	{
		if(p!=null)
		{
			p.close();
		}
	}

	protected void startApp() {
		display.setCurrent(f);
	}

}