java wav player adding pause and continue

问题:

I have this code which plays wav files from a folder with play and stop. How can I add pause and continue?

 import java.awt.*;
 import java.awt.event.*;
 import javax.swing.*;
 import javax.swing.event.*;
 import java.applet.AudioClip;  
 import java.net.URL;  

public class JukeBox extends JFrame {
  private JComboBox musicCombo;
  private JButton stopButton, playButton;
  private AudioClip[] music;
  private AudioClip current;

  public JukeBox(String title) {
    super(title);
    getContentPane().add(new JukeBoxControls());
  }

  public static void main(String [] args) {
    JukeBox myf = new JukeBox ("WAV COMBOBOX");
    myf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    myf.pack();
    myf.setVisible(true);
  }

  private class JukeBoxControls extends JPanel {
    public JukeBoxControls() {
      URL url1, url2, url3, url4, url5;
      url1 = url2 = url3 = url4 = url5 = null;

      try
      {
         url1 = new URL ("file", "localhost", "beep-01a.wav");
         url2 = new URL ("file", "localhost", "beep-02.wav");
         url3 = new URL ("file", "localhost", "beep-03.wav");
         url4 = new URL ("file", "localhost", "beep-04.wav");
         url5 = new URL ("file", "localhost", "beep-05.wav");
      }
      catch (Exception exception) {}

      music = new AudioClip[7];
      music[0] = null;
      music[1] = JApplet.newAudioClip (url1);
      music[2] = JApplet.newAudioClip (url2);
      music[3] = JApplet.newAudioClip (url3);
      music[4] = JApplet.newAudioClip (url4);
      music[5] = JApplet.newAudioClip (url5);

      JLabel titleLabel = new JLabel ("WAV COMBOBOX");
      titleLabel.setAlignmentX (Component.CENTER_ALIGNMENT);

      String[] musicNames = {"vyberte...", "sound 1",
               "sound 2", "sound 3", "sound 4",
               "sound 5"};

      musicCombo = new JComboBox (musicNames);
      musicCombo.setAlignmentX (Component.CENTER_ALIGNMENT);

      playButton = new JButton ("Play", new ImageIcon ("play.gif"));
      playButton.setBackground (Color.white);
      stopButton = new JButton ("Stop", new ImageIcon ("stop.png"));
      stopButton.setBackground (Color.white);

      JPanel buttons = new JPanel();
      buttons.setLayout (new BoxLayout (buttons, BoxLayout.X_AXIS));
      buttons.add (playButton);
      buttons.add (Box.createRigidArea (new Dimension(5,0)));
      buttons.add (stopButton);

      setPreferredSize (new Dimension (350, 200));
      setLayout (new BoxLayout (this, BoxLayout.Y_AXIS));
      add (Box.createRigidArea (new Dimension(0,5)));
      add (titleLabel);
      add (Box.createRigidArea (new Dimension(0,5)));
      add (musicCombo);
      add (Box.createRigidArea (new Dimension(0,5)));
      add (buttons);
      add (Box.createRigidArea (new Dimension(0,5)));

      musicCombo.addActionListener (new ComboListener());
      stopButton.addActionListener (new ButtonListener());
      playButton.addActionListener (new ButtonListener());

      current = null;
    }
   }

   private class ComboListener implements ActionListener {
      public void actionPerformed (ActionEvent event)
      {
         if (current != null)
            current.stop();

         current = music[musicCombo.getSelectedIndex()];
      }
   }

   private class ButtonListener implements ActionListener {
      public void actionPerformed (ActionEvent event)
      {
         if (current != null)
            current.stop();

         if (event.getSource() == playButton)
            if (current != null)
               current.play();
      }
   }
}

回答1:

If you were to use javax.sound.sampled.Clip and the supporting API instead of java.applet.AudioClip, you would gain much more control over the audio clip, for example...

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineEvent;
import javax.sound.sampled.LineEvent.Type;
import javax.sound.sampled.LineListener;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class SimplyPlayer {

    public static void main(String[] args) {
        new SimplyPlayer();
    }

    public SimplyPlayer() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        private Clip clip;
        private JTextField audioFile;
        private JButton play;
        private JButton stop;
        private int lastFrame;

        public TestPane() {
            setLayout(new GridBagLayout());

            audioFile = new JTextField(20);
            play = new JButton(">");
            stop = new JButton("[]");

            JPanel controls = new JPanel();
            controls.add(play);
            controls.add(stop);

            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.weightx = 1;
            gbc.fill = GridBagConstraints.HORIZONTAL;
            add(audioFile, gbc);
            gbc.gridy++;
            add(controls, gbc);

            play.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    if (clip == null) {
                        try {
                            loadClip(new File(audioFile.getText()));
                            clip.start();
                            clip.addLineListener(new LineListener() {
                                @Override
                                public void update(LineEvent event) {
                                    if (event.getType().equals(Type.START)) {
                                        play.setText("||");
                                    } else if (event.getType().equals(Type.OPEN)) {
                                        System.out.println("Open");
                                    } else if (event.getType().equals(Type.STOP)) {
                                        play.setText(">");
                                    } else if (event.getType().equals(Type.CLOSE)) {
                                        play.setText(">");
                                    }
                                }
                            });
                            play.setText("||");
                        } catch (LineUnavailableException | IOException | UnsupportedAudioFileException ex) {
                            ex.printStackTrace();
                            JOptionPane.showMessageDialog(TestPane.this, "Failed to load audio clip", "Error", JOptionPane.ERROR_MESSAGE);
                        }
                    } else {

                        if (clip.isRunning()) {
                            lastFrame = clip.getFramePosition();
                            clip.stop();
                        } else {
                            if (lastFrame < clip.getFrameLength()) {
                                clip.setFramePosition(lastFrame);
                            } else {
                                clip.setFramePosition(0);
                            }
                            clip.start();
                        }

                    }
                }
            });

            stop.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    if (clip != null) {
                        lastFrame = 0;
                        clip.stop();
                    }
                }
            });
        }

        protected void loadClip(File audioFile) throws LineUnavailableException, IOException, UnsupportedAudioFileException {

            AudioInputStream audioStream = AudioSystem.getAudioInputStream(audioFile);

            AudioFormat format = audioStream.getFormat();
            DataLine.Info info = new DataLine.Info(Clip.class, format);
            this.clip = (Clip) AudioSystem.getLine(info);
            this.clip.open(audioStream);

        }
    }

}

Basically, when playing and you press the "pause" button, the ActionListener gets the current playback frame and stops the clip, when you click the play button ActionListener will set the clip to the current frame and resume playback

回答2:

I think I have an easier solution that does not use internal classes. You can create a clip by only a line code. I used JAVA 1.6 on order that more people can use the code.

Here are my classes:

MainClass :

import java.awt.EventQueue;

public class MainClass {

    public static void main(String[] _args) {
        EventQueue.invokeLater(new LaunchingWindow());
    }
}

LaunchingWindow :

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.UIManager;

public class LaunchingWindow extends Thread {

    @Override
    public void run() {
         try {
             UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
         } catch (Exception _0) {
         }

         JFrame frame_ = new JFrame("Testing");
         frame_.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame_.setLayout(new BorderLayout());
         frame_.add(new MusicContainer());
         frame_.pack();
         frame_.setLocationRelativeTo(null);
         frame_.setVisible(true);
    }
}

MusicContainer:

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.io.File;

import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.swing.JButton;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class MusicContainer extends JPanel {

    private Clip clip;
    private JTextField audioFile;
    private JButton play;
    private JButton stop;
    private int lastFrame;

    public MusicContainer() {
        setLayout(new GridBagLayout());

        audioFile = new JTextField(20);
        play = new JButton(">");
        stop = new JButton("[]");

        JPanel controls_ = new JPanel();
        controls_.add(play);
        controls_.add(stop);

        GridBagConstraints gbc_ = new GridBagConstraints();
        gbc_.gridx = 0;
        gbc_.gridy = 0;
        gbc_.weightx = 1;
        gbc_.fill = GridBagConstraints.HORIZONTAL;
        add(audioFile, gbc_);
        gbc_.gridy++;
        add(controls_, gbc_);

        play.addActionListener(new PlayingMusic(this));

        stop.addActionListener(new StoppingMusic(this));
    }

    public void playMusic() {
        if (clip == null) {
            try {
                loadClip(new File(audioFile.getText()));
                clip.start();
                clip.addLineListener(new MusicListener(play));
                play.setText("||");
            } catch (Exception _0) {
                _0.printStackTrace();
                JOptionPane.showMessageDialog(this, "Failed to load audio clip", "Error", JOptionPane.ERROR_MESSAGE);
            }
        } else {

            if (clip.isRunning()) {
                lastFrame = clip.getFramePosition();
                clip.stop();
            } else {
                if (lastFrame < clip.getFrameLength()) {
                    clip.setFramePosition(lastFrame);
                } else {
                    clip.setFramePosition(0);
                }
                clip.start();
            }

        }
    }

    public void stopMusic() {
        if (clip != null) {
            lastFrame = 0;
            clip.stop();
        }
    }

    protected void loadClip(File _audioFile) throws Exception {

        AudioInputStream audioStream_ = AudioSystem.getAudioInputStream(_audioFile);
        //AudioSystem.getClip() is much easier
        clip = AudioSystem.getClip();
        clip.open(audioStream_);

    }
}

MusicListener :

import javax.sound.sampled.LineEvent;
import javax.sound.sampled.LineListener;
import javax.swing.JButton;

public class MusicListener implements LineListener {

    private static final String START = "START";
    private static final String OPEN = "OPEN";
    private static final String STOP = "STOP";
    private static final String CLOSE = "CLOSE";

    private JButton play;

    public MusicListener(JButton _play) {
        play = _play;
    }

    @Override
    public void update(LineEvent _event) {
        String eventType_ = _event.getType().toString();
        if (eventType_.equalsIgnoreCase(START)) {
            play.setText("||");
        } else if (eventType_.equalsIgnoreCase(OPEN)) {
            System.out.println("Open");
        } else if (eventType_.equalsIgnoreCase(STOP)) {
            System.out.println("close");
            play.setText(">");
        } else if (eventType_.equalsIgnoreCase(CLOSE)) {
            play.setText(">");
        }
    }

}

PlayingMusic :

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class PlayingMusic implements ActionListener {

    private MusicContainer container;

    public PlayingMusic(MusicContainer _container) {
        container = _container;
    }

    @Override
    public void actionPerformed(ActionEvent _e) {
        container.playMusic();
    }

}

StoppingMusic :

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class StoppingMusic implements ActionListener {

    private MusicContainer container;

    public StoppingMusic(MusicContainer _container) {
        container = _container;
    }

    @Override
    public void actionPerformed(ActionEvent _e) {
        container.stopMusic();
    }

}