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I am making an MP3 player but my problem is I cant automatically start a new song after the old one is finished. I have tried using isComplete()

Then I tried finding the length of the song and using thread.sleep() and I set it as the same length as my song so when the song is over a new one starts and it worked, the only problem is I cant click on any buttons and when i try to exit nothing happens, the song keeps playing and a new one will start but the window freezes

If you could help that would be great (The problem is around line 312)

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.logging.*;
import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.net.*;

import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.swing.*;

import javazoom.jl.player.Player;
import javazoom.spi.mpeg.sampled.file.MpegAudioFileReader;


public class PPR extends JPanel{

private static long startTime;
private static long stopTime;
static int ms;

static int songnumber = 0;
static String song;
static Long duration;
//Above is the song number and the path
static File test = new File ("C:/Users/cmtc/Documents/WorkSpace/Mp3 Player/music/aa.mp3");

static File[] files = new File("music").listFiles();
static LinkedList songnames = new LinkedList();
//above is the array that gets all of the files and the linked list that gets all the names



 private final static int NOTSTARTED = 0;
 private final static int PLAYING = 1;
 private final static int PAUSED = 2;
 private final static int FINISHED = 3;
    //above tell the player what is happening


    private final Object playerLock = new Object();
    //not sure if i need above


    private static int playerStatus = NOTSTARTED;
    //above starts off by saying the player hasnt started yet


static JFrame f = new JFrame();
static JPanel p = new JPanel();
static String filename = "this string doesnt matter";


//above is the jpanel and jframe

 static FileInputStream input; 
 static MP3 player; 
 //above allows for file io and the mp3 player

    static Runnable Graphic = new Runnable() {
     public void run() {
         gui();
     }
 };

 // I had to make threads so that more than one button is visible

 public static void invokeLater(Runnable doRun){
     SwingUtilities.invokeLater(Graphic);
}

 //above is what allows multiple buttons to be visible




public PPR(){

    SwingUtilities.invokeLater(Graphic);
}

//above is similar to what is above this


public static void gui(){
    f.setVisible(true);
        f.setSize(1600,900);
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.add(p);

    PlayPauseRewind();

}

//above is baseically what runs the three buttons

public static void PlayPauseRewind(){




    Object play = ppr(80,26,25,25,"pics/play.jpg");

    ((AbstractButton) play).addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e){
            startTime = e.getWhen();
            if (playerStatus == PLAYING){
                pause();
                playerStatus = PAUSED;
            }else if (playerStatus == NOTSTARTED){
                 play();
                 playerStatus = PLAYING;
            }else if (playerStatus == PAUSED){
             resume();
             playerStatus = PLAYING;
        }


        }

    });



    //above is play ***************************************


    Object next = ppr(120,26,25,25,"pics/next.png");
    ((AbstractButton) next).addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e){
            if (songnumber == files.length-1){
                System.out.println("No More songs");
            }else if (playerStatus == NOTSTARTED){
                play();
                playerStatus = PLAYING;
                pause();
                 playerStatus = PAUSED;
                 songnumber++;
                 play();
                    playerStatus = PLAYING;
                System.out.println(songnumber);
            }else if (playerStatus == PAUSED){
                songnumber++;
                play();
                pause();
                playerStatus = PAUSED;
                System.out.println(songnumber);
            }else{
            stop();
            songnumber++;
            System.out.println(songnumber);

            //above tells the next button what to do below is the try/catch


            try {
                input = new FileInputStream(allsongs(songnumber,song)); 
                player = new MP3(input);

                // start playing
                player.play();

                // after 5 secs, pause

            } catch (final Exception e1) {
                throw new RuntimeException(e1);
            }
            playerStatus = PLAYING;
            }   
        }
    });



    Object back = ppr(40,26,25,25,"pics/back.png");
    ((AbstractButton) back).addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e){
            if (songnumber == 0){
                System.out.println("No More songs");
            }else if (playerStatus == NOTSTARTED){
                play();
                playerStatus = PLAYING;
                pause();
                 playerStatus = PAUSED;
                 songnumber--;
                 play();
                    playerStatus = PLAYING;
                System.out.println(songnumber);
            }else if (playerStatus == PAUSED){
                songnumber--;
                play();
                pause();
                playerStatus = PAUSED;
                System.out.println(songnumber);
            }else{
            stop();
            songnumber--;
            System.out.println(songnumber);

            //above tells the back button what to do below is the try/catch

            try {
                input = new FileInputStream(allsongs(songnumber,song)); 
                player = new MP3(input);

                // start playing
                player.play();

                // after 5 secs, pause

            } catch (final Exception e1) {
                throw new RuntimeException(e1);
            }
            playerStatus = PLAYING;
            }   
        }
    });

}

public static Object ppr(int x, int y, int width, int height, String file){
    p.setLayout(null);      

    Toolkit tool = Toolkit.getDefaultToolkit();
        Image player = tool.getImage(file);
            ImageIcon playbutton = new ImageIcon(player);

    JButton play = new JButton(playbutton);
        play.setBounds(x, y, width, height);

            return p.add(play);

            //above is a method that makes creating buttons very easy
}


public static void play(){
    startTime = System.currentTimeMillis();
    try {
        input = new FileInputStream(allsongs(songnumber,song)); 
        player = new MP3(input);

        player.play();

    } catch (final Exception e) {
        throw new RuntimeException(e);
    }
    playerStatus = PLAYING;

    nextsong();


}

//above is the play method




public static void pause(){
    try {

        // start playing
        player.pause();

        // after 5 secs, pause

    } catch (final Exception e) {
        throw new RuntimeException(e);
    }
    playerStatus = PAUSED;
}
//above is the pause method

public static void resume(){
    try {

        // start playing
        player.resume();

        // after 5 secs, pause

    } catch (final Exception e) {
        throw new RuntimeException(e);
    }
}

public static void length(){

    long size = files[songnumber].length();
    AudioFileFormat baseFileFormat;
    int ms = 0;
    try {
        baseFileFormat = new MpegAudioFileReader().getAudioFileFormat(files[songnumber]);
        Map properties = baseFileFormat.properties();
        duration = (Long) properties.get("duration");
        duration = duration/1000;
        ms = (int) (duration/10);
        System.out.println(ms);
        //System.out.println(size);
    } catch (UnsupportedAudioFileException | IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

//ABOVE AND BELOW IS WHERE I AM TRYING TO FIX IT;

public static void nextsong(){
    length(); 
    try {
        Thread.sleep(duration);
        stop();
        songnumber++;
        play();
        playerStatus=PLAYING;

    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}


public static void stop(){
    try {

        player.stop();

    } catch (final Exception e) {
        throw new RuntimeException(e);
    }
}

//above is the resume method

public static void temp(){
    JOptionPane.showMessageDialog(null, "Action Listener is working");
}
//above is what I use to make sure the actionlistener is working I wont need it eventually

public static String allsongs(int songnumber,String song){
            for (int i = 0; i<files.length;i++){

            songnames.add("music/" + files[i].getName());   

            song = (String) songnames.get(songnumber);

        }
            return song;
    }

//above is the loop that goes through the folder and names everysong while         assigning it a song number


}
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1 回答 1

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您正在使用某种 MP3 播放器,我无法追踪它的来源,因为我找不到匹配的导入语句:

 player = new MP3(input);

 player.play();

最常见的做法是为播放器添加一个监听器(如果你的 MP3 类支持它),比如

player.addXXXListener(new XXXListener(){});

XXXlistener 将有一个在播放完毕后被调用的方法,在该方法中您可以开始下一首歌曲。

所以这取决于你的 MP3 类支持什么。

于 2013-03-29T19:26:18.760 回答