Java MP3Player通过使用Javazoom播放和暂停

Question

I'm making a simple MP3Player in Java. I have managed to play a .mp3 file but when I start playing the whole program freezes and I can't click any buttons in the program. I need help making the pause button, or any other button work after I start playing. This is my code:

    import java.awt.*;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.io.InputStream;
    import java.net.URL;
    import javazoom.jl.player.advanced.AdvancedPlayer;
    import javax.swing.*;

    public class MP3Player extends JFrame{

    public MP3Player(){
        JPanel jpBottom = new JPanel();
        JButton btnPlay = new JButton("Play");
        JButton btnPause = new JButton("Pause");

        jpBottom.add(btnPause);
        jpBottom.add(btnPlay);

        Container cp = this.getContentPane();
        BorderLayout bl = new BorderLayout();
        cp.setLayout(bl);
        cp.add(jpBottom, BorderLayout.SOUTH);

        btnPlay.addActionListener(
                new ActionListener() {
                    public void actionPerformed(ActionEvent e) {
                        Play("file:///C://a.mp3");
                    }
                }
        );

        this.setVisible(true);
        this.setSize(250, 100);
        this.setTitle("MP3 Player");
        this.setLocation(100, 100);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public void Play(String path){
        try{
            URL url = new URL(path);
            InputStream in = url.openStream();
            //Player pl = new Player(in);
            //pl.play();
            AdvancedPlayer pl = new AdvancedPlayer(in);

            pl.getPlayBackListener();
            pl.play();             
        }
        catch(Exception e){
            System.out.println("Feil: "+e);
        }
    }

    public static void main(String[] args) {
        MP3Player n = new MP3Player();
    }
}

Answer 1

You should call Play() method in a separate thread and also have a good understanging of Multithreding in Swing . At least you should read about SwingUtilities.invokeLater()

Answer 2

I need help making the pause button, ..

The method to pause the player is stop() . But that code creates the AdvancedPlayer local to a method. Instead, the class needs to declare an AdvancedPlayer attribute and reference that class attribute in the actionPerformed() method.