applet 中播放音乐时出现问题

mingchaoyan 2010-05-16 02:45:39

import java.applet.Applet;

import java.applet.AudioClip;

import java.awt.BorderLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;



import javax.swing.JButton;

import javax.swing.JPanel;

public class Audio extends Applet {

	private JPanel panel;

	private JButton button;

	private AudioClip sound;

	private boolean play = true;

	public void init() {

		panel = new JPanel();

		button = new JButton("Play");

		sound = getAudioClip(getDocumentBase(),"DragonMusic/BG_000.mid");

		panel.setLayout(new BorderLayout());

		panel.add(button, BorderLayout.CENTER);

	    button.addActionListener(new JButtonListener());		

		add(panel);

		sound.loop();

	}

	public class JButtonListener implements ActionListener{

		public void actionPerformed(ActionEvent event){

			if(event.getSource()==button){

				System.out.println(play);

				if(play) {

					sound.stop();

					play = false;

				} else {

					sound.stop();

					sound.loop();

					play  = true;

				}

			}

		}

	}

}

// <applet code=Audio width=100 height=200></applet>

这个只是单个音乐，play键一按就停再按就重放，已测试可以实现，

下面我想多个音乐按上下或左右键切换， play键同样有暂停播放功能
可是按上两次后再按就再也不会出声了，
请高手指教

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

import javax.swing.*;

public class Study extends Applet{

	private static int i=0;

	private JPanel panel;

	private JButton button;

	private JButton buttonUp;

	private JButton buttonDown;

	private JButton buttonLeft;

	private JButton buttonRight;

	private AudioClip backSound[];

	private AudioClip sound;

	public void init(){

		panel=new JPanel();

		button=new JButton("Play");

		buttonUp=new JButton("↑");

		buttonDown=new JButton("↓");

	    buttonLeft=new JButton("←");

	    buttonRight=new JButton("→");

	    

	    button.addActionListener(new JButtonListener());

	    buttonUp.addActionListener(new JButtonListener());

	    buttonDown.addActionListener(new JButtonListener());

	    buttonLeft.addActionListener(new JButtonListener());

	    buttonRight.addActionListener(new JButtonListener());

	    

	    backSound=new AudioClip[67];

		for(int n=0;n<67;n++){

			if(n/10==0){

				backSound[n]=getAudioClip(getDocumentBase(),"DragonMusic\\BG_00"+n+".mid");

			}

			else{

				backSound[n]=getAudioClip(getDocumentBase(),"DragonMusic\\BG_0"+n+".mid");

			}

		} 

		sound=backSound[0];

		sound.loop();

	    setSize(400,300);

	    panel.setLayout(new BorderLayout());

	    panel.add(button,BorderLayout.CENTER);

	    panel.add(buttonLeft,BorderLayout.WEST);

	    panel.add(buttonRight,BorderLayout.EAST);

	    panel.add(buttonUp,BorderLayout.NORTH);

	    panel.add(buttonDown,BorderLayout.SOUTH);

	    add(panel);

	}

	private class JButtonListener implements ActionListener{

		public void actionPerformed(ActionEvent event){

			if(event.getSource()==button){

				sound.stop();

				sound=backSound[i];

				sound.loop();

			}

			else if(event.getSource()==buttonLeft||event.getSource()==buttonUp){

				sound.stop();

				if(i>0){

					i--;

					sound=backSound[i];

					sound.loop();

				}

				else{

				   i=backSound.length-1;

				   sound=backSound[i];

				   sound.loop();

				}

			}

			else if(event.getSource()==buttonRight||event.getSource()==buttonDown){

				sound.stop();

				if(i==backSound.length-1){

					i=0;

					sound=backSound[i];

					sound.loop();

				}

				else{

					i++;

					sound=backSound[i];

					sound.loop();

				}

			}

	    }

    }

}