Question

因此，我创建了代码，使我可以通过浏览计算机上的音乐文件将歌曲添加到音乐播放器中，然后创建一个带有歌曲名称和文件路径的按钮，以便可以播放。每次浏览和选择歌曲时，都会为新创建的歌曲按钮分配一个新的媒体播放器，该按钮在单击时会播放歌曲。我想添加一个停止按钮，该按钮将停止当前正在播放的歌曲或所有歌曲。

这是我创建歌曲按钮的方法：

  public void makeSongButton(Song song) {
   MyButton myButton = new MyButton(song, "Play " + song.getName() + " (" + 
  song.getDuration() + ")", this.nextX, this.nextY);

//update nextY
this.nextY++;

// add to buttons list
this.buttons.add(myButton);


myButton.setOnAction(new EventHandler<ActionEvent>() {
    @Override
    public void handle(ActionEvent event) {
      //code to play a song modified from stackoverflow user jasonwaste's answer on https://stackoverflow.com/questions/6045384/playing-mp3-and-wav-in-java
      //system.out.println("play!!!");
      labelError.setText("play!");
      final MyButton myButton = (MyButton)event.getSource();
      final Song song = myButton.getSong();
      String songFile = song.getFile();
      Media media = new Media(new File(songFile).toURI().toString());
      MediaPlayer mediaPlayer = new MediaPlayer(media);
      mediaPlayer.play();


      //update player state...

      labelMsg.setText(song.getName());
    }
});

}

每次有人拉出下面显示的程序时，当用户单击显示的按钮BrowseButton时，就会调用此函数：

  public void makeBrowseButton(Stage primaryStage, BMPData bmpData) {

 browseButton.setOnAction(new EventHandler<ActionEvent>() {
  @Override
  public void handle(ActionEvent event) {

    labelError.setText("browse!");

    // create fileChooser so user can browse
    FileChooser fileChooser = new FileChooser();                                                                            // create object
    fileChooser.getExtensionFilters().addAll(new FileChooser.ExtensionFilter("Audio Files", "*.wav", "*.mp3", "*.aac"));    //filter for music files
    if ( !parentPath.equalsIgnoreCase("")) {                                                                                //go to previous directory if exists
            File parentPathFile = new File(parentPath);
            fileChooser.setInitialDirectory(parentPathFile);
    }
    File selectedFile = fileChooser.showOpenDialog(primaryStage);                                                           // display the dialog box

    // processing IF file was chosen
    if (selectedFile != null) {
      // extract song name and file name from selected file object
      String name = selectedFile.getName();
      String wholePath = selectedFile.getPath();
          parentPath = selectedFile.getParent();

          Song song = new Song(name, wholePath);
      //update library
      bmpData.setNewSong(song);

      //make a button for the song
      makeSongButton(song);


      createDisplay(primaryStage, bmpData);
    }
  }
});

}

因此，在BrowseButton的最后一位中，我们调用makeSongButton来为歌曲创建一个按钮，以便可以播放它，但是每次makeSongbutton调用都会创建一个新的mediaplayer，我希望能够创建一个停止所有mediaPlayers的停止按钮。 ...

Answer 1

也许与此...

Button btn_stop = new Button("stop it!");
btn_stop.setOnAction(new EventHandler<ActionEvent>() {
        public void handle(ActionEvent event) {
            mediaPlayer.stop();
            System.out.println("Stop Media Player");
        }
    });

如何为我的mediaPlayer创建一个停止按钮

1 个答案: