java - 如何根据用户选择将文件文件夹添加到 JavaFx 中的 ListControl？

Question

我正在尝试添加一个按钮，允许用户选择 wav 文件的文件夹，然后将其添加到 ListControl 中，可以选择它们进行播放。我最初创建了一个包含文件夹路径的字符串变量，但现在希望允许用户选择一个文件夹，然后将其加载到 ListControl 中。当用户选择文件夹时，文件不会添加到 ListControl 中。这是我到目前为止所拥有的。任何提示或提示将不胜感激。提前致谢。

public class Molly2b extends Application {

private List<File> list = new ArrayList<File>();


private void init(final Stage primaryStage) { 
    Group root = new Group();
primaryStage.setScene(new Scene(root));     
HBox hBox2 = new HBox();
    hBox2.setSpacing(20);
    hBox2.setTranslateY(30);                        
hBox2.getChildren().add(createChart());
final DirectoryChooser fileChooser = new DirectoryChooser();

final Button chooseDirButton = new Button("Choose Directory");
    chooseDirButton.setOnAction(
        new EventHandler<ActionEvent>() {
            @Override
             public void handle(final ActionEvent e) {
         final DirectoryChooser dirChooser = new DirectoryChooser();

                 final File selectedDirectory = dirChooser.showDialog(primaryStage);
                 if (selectedDirectory != null) {  
                    selectedDirectory.getAbsolutePath();
                    addFilesFromDir(selectedDirectory);
                }
            }
        });



    VBox vBox = new VBox(50);
    vBox.getChildren().addAll(hBox2);



    final ObservableList<File> listObserv = FXCollections.<File>observableList(list);   
    ListView<File> listView = new ListView<File>(listObserv);
                         listView.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
        listView.getSelectionModel().selectedItemProperty().addListener(
        new ChangeListener<File>() {
            public void changed(ObservableValue<? extends File> ov, 
            File old_val, File new_val) {
            playAudio(new_val);                                             
        }
    });

    BorderPane bp = new BorderPane();
               bp.setLeft(listView);
           bp.setRight(vBox);
        bp.setTop(chooseDirButton);
    root.getChildren().add(bp);       
}

public void addFilesFromDir(File dir){

     if (dir.isDirectory()){ 
        File[] loopsList = dir.listFiles();
        for (File f:loopsList){
            String s = f.getName();             
            if (s.endsWith(".wav")){
                list.add(f);                    
            }               
        }           
    }
}


public void playAudio(File file){   
        try{
            AudioInputStream ais = AudioSystem.getAudioInputStream(file);            
         AudioFormat audioFormat = ais.getFormat();       
      DataLine.Info dataLineInfo = new DataLine.Info(Clip.class,audioFormat);                 
                       Clip clip = (Clip) AudioSystem.getLine(dataLineInfo);                                                 
                             clip.open(ais);                                                             
                             clip.setLoopPoints(0,-1);                           
                             clip.loop(0);                          
        } catch (LineUnavailableException ex){
        } catch (UnsupportedAudioFileException ef){
        } catch (IOException e){
        }           
    }

@Override 
public void start(Stage primaryStage) throws Exception {
    init(primaryStage);
    primaryStage.show();                
}

public static void main(String[] args) {
Application.launch(args);       
}
}

Answer 1

您是指 FileChooser 或 DirectoryChooser 之类的东西吗？

http://docs.oracle.com/javafx/2/ui_controls/file-chooser.htm

看来您已经更改了问题。

public class Molly2b extends Application {

private URI path;
private FileChooser fileChooser;// = new FileChooser();
private ObservableList<File> listype;// 
private ListView<String> listView;
private ListCell<String> listCell;

private void init(final Stage primaryStage) {

    Group root = new Group();
    HBox hBox2 = new HBox();
    hBox2.setSpacing(20);
    hBox2.setTranslateY(30);
    listView = new ListView<>();
    listCell = new ListCell<>();

    final Button chooseDirButton = new Button("Choose Directory");
    //listView.setCellFactory(TextFieldListCell.forListView());
    chooseDirButton.setOnAction(
            new EventHandler<ActionEvent>() {
                @Override
                public void handle(final ActionEvent e) {
                    fileChooser = new FileChooser();
                    listype = FXCollections.observableList();
                    fileChooser.showOpenMultipleDialog(primaryStage)
                    if (listype != null) {
                        for (int i = 0; i < listype.size(); i++) {
                            path = listype.get(i).toURI();
                            String filename = listype.get(i).getName();
                            listCell.setItem(filename);
                            final ObservableList olist = FXCollections   
                                                          .observableArrayList();
                            olist.addListener(new InvalidationListener() {

                                @Override
                                public void invalidated(Observable o) {
                                    listView.getItems();
                                }
                            });
                            olist.addListener(new ListChangeListener() {

                                @Override
                                public void onChanged(ListChangeListener.Change 
                                                                          change) {
                                    change.getList();
                                    listView.setItems(olist);
                                }
                            });
                            olist.setAll(listView.getItems());
                            olist.add(filename);
                        }
                    }
                }
            });
    VBox vBox = new VBox(50);
    vBox.getChildren().addAll(hBox2);
    //listView.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
    listView.getSelectionModel().selectedIndexProperty().addListener(
                                             new ChangeListener<Number>() {

        @Override
        public void changed(ObservableValue<? extends Number> ov, 
                                               Number oldValue, Number newValue) {
            ov.getValue();
            if(newValue.intValue == 0) {
                listView.getItems().addListener(new InvalidationListener() {
                    @Override
                     public void invalidated(Observable o) {
                         listCell.getIndex();
                     }
                });
                path = listype.get(newValue.intValue()).toURI();
            }
            try {
                String newpath = path.toString();
                playAudio(newpath);
            } catch (IOException | 
                    LineUnavailableException | UnsupportedAudioFileException e) {

            }
        }
    });

    BorderPane bp = new BorderPane();
    bp.setLeft(listView);
    bp.setRight(vBox);
    bp.setTop(chooseDirButton);
    root.getChildren().add(bp);
    primaryStage.setScene(new Scene(root));
}

public void playAudio(String path) throws UnsupportedAudioFileException, 
                                           IOException, LineUnavailableException {
    Media media = new Media(path);
    final MediaPlayer player = new MediaPlayer(media);
    player.play();
}

@Override
public void start(Stage primaryStage) throws Exception {
    init(primaryStage);
    primaryStage.show();
}

public static void main(String[] args) {
    Application.launch(args);
}
}

按其应有的方式工作。唯一需要改变的是它可以同时播放 2 首歌曲。