Question

所以我正在尝试创建一个音乐播放器小部件，但一次只能播放多个选定的歌曲。我希望增强的for循环将遍历所有选定的文件并一次播放一个，但它同时播放所有歌曲。有没有更好的方法来使这项工作？

FileInputStream FIS;
BufferedInputStream BIS;

public Player player;
public long pauseLocation;
public long songTotalLength;
public boolean playState = false;
public String fileLocation;

public boolean playState(){
    return playState;
}

public void setPlayState(boolean value){
    this.playState = value;
}
public void select() {

    FileNameExtensionFilter filter = new FileNameExtensionFilter("MP3 Files", "mp3", "mpeg3");
    JFileChooser chooser = new JFileChooser("D:\\MAIN_DIV\\Music");
    chooser.addChoosableFileFilter(filter);
    chooser.setMultiSelectionEnabled(true);
    int returnVal = chooser.showOpenDialog(null);

    if (returnVal == JFileChooser.APPROVE_OPTION) {
        stop();

        if (playState == false) {
            File[] selectedFile = chooser.getSelectedFiles();
            for (File x : selectedFile) {
                String song = x + "";
                String name = chooser.getSelectedFile().getName();
                display.setText(name);
                play(song);
            }
        }
    }
}

public void play(String path){

    playState();
        try {
            FIS = new FileInputStream(path);
            BIS = new BufferedInputStream(FIS);
            player = new Player(BIS);
            songTotalLength = FIS.available();
            fileLocation = path + "";
            //System.out.println(path);
        } catch (FileNotFoundException | JavaLayerException ex) {

        } catch (IOException ex) {

        }



    new Thread (){
        @Override
        public void run(){

            if(playState == false){

                try {
                        player.play(); //play from start or resume


                    if (player.isComplete() && MusicPlayer.count==1){
                        play(fileLocation); 


                    }
                    if (player.isComplete()){
                        MusicPlayer.display.setText("");
                    }

                } catch (JavaLayerException ex) {

                }
            }    
        }
    }.start();
    setPlayState(false);

}

Answer 1

这是问题的原因：

new Thread () { ... } .start();

创建一个在后台运行的线程来播放歌曲。歌曲播放时play方法返回，让for - 循环继续拾取新歌。

如果您只保留run - 方法的正文，它应该按预期工作。这样，歌曲播放是顺序的，play阻止，直到player.play();完成。

如何在getSelectedFiles（）方法中一次访问和操作一个文件？

1 个答案: