[JavaFX] ListView con immagini

[fermat]

ciao!

sto cercando di riempire una ListView in JavaFX con immagini.

prendo la lista di immagini da un DirectoryChooser:

public class ListImages {
    public static ArrayList<String> getImages(File directory, Stage stage) {
        ArrayList<String> images = new ArrayList<>();
        DirectoryChooser dc = new DirectoryChooser();
        dc.setTitle("Open photo directory");
        dc.setInitialDirectory(directory);
        File dir = dc.showDialog(stage);
        if (dir != null) {
            File[] files = dir.listFiles((dir1, name) -> (name.endsWith(".jpg") || name.endsWith(".jpeg") || name.endsWith(".png")));
            for (File f : files) {
                images.add(f.getAbsolutePath());
            }
        }
        return images;
    }
}

poi nel controller lancio questo metodo:

@FXML
private void openDirectory() {
    images = ListImages.getImages(new File(System.getProperty("user.home") + "/1_TEST_PHOTO"), getStage());
    ObservableList<String> items = FXCollections.observableArrayList(images);
    listViewImages.setItems(items);
    listViewImages.setCellFactory(param -> new ListCell<String>() {
        private ImageView imageView = new ImageView();

        @Override
public void updateItem(String name, boolean empty) {
            super.updateItem(name, empty);
            imageView.setImage(new Image(name));
            setGraphic(imageView);
setText(name);
        }
    });
}

la lista viene correttamente riempita:

/home/matte/1_TEST_PHOTO/pexels-photo-23978.jpg
/home/matte/1_TEST_PHOTO/pexels-photo-23978.jpg
/home/matte/1_TEST_PHOTO/pexels-photo-28762.jpg
/home/matte/1_TEST_PHOTO/pexels-photo.jpg
/home/matte/1_TEST_PHOTO/pexels-photo-27414.jpg
/home/matte/1_TEST_PHOTO/night-studio-color-minimalism-60470.jpeg
/home/matte/1_TEST_PHOTO/training-train-lime-barbell-39688.jpeg
/home/matte/1_TEST_PHOTO/pexels-photo.jpeg
/home/matte/1_TEST_PHOTO/norway-mountain-sky-blue.jpg
/home/matte/1_TEST_PHOTO/pexels-photo-70381.png
/home/matte/1_TEST_PHOTO/fishing-sea-man-person.jpg
/home/matte/1_TEST_PHOTO/pexels-photo-69224.jpeg

però ottengo questo errore:

Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: URL must not be null
    at javafx.scene.image.Image.validateUrl(Image.java:1093)
    at javafx.scene.image.Image.<init>(Image.java:620)
    at com.mp.photoalbum.MainController$1.updateItem(MainController.java:47)
    at com.mp.photoalbum.MainController$1.updateItem(MainController.java:41)
    at javafx.scene.control.ListCell.updateItem(ListCell.java:480)
    at javafx.scene.control.ListCell.access$300(ListCell.java:72)
    at javafx.scene.control.ListCell$4.invalidated(ListCell.java:299)
    at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:111)
    at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)
    at javafx.scene.control.ListCell.setListView(ListCell.java:305)
    at javafx.scene.control.ListCell.updateListView(ListCell.java:494)
    at com.sun.javafx.scene.control.skin.ListViewSkin.createCell(ListViewSkin.java:292)
    at com.sun.javafx.scene.control.skin.ListViewSkin.lambda$new$2(ListViewSkin.java:99)
    at com.sun.javafx.scene.control.skin.VirtualFlow.getCell(VirtualFlow.java:1777)
    at com.sun.javafx.scene.control.skin.VirtualFlow.getCellLength(VirtualFlow.java:1879)
    at com.sun.javafx.scene.control.skin.VirtualFlow.computeViewportOffset(VirtualFlow.java:2528)
    at com.sun.javafx.scene.control.skin.VirtualFlow.layoutChildren(VirtualFlow.java:1189)
    at javafx.scene.Parent.layout(Parent.java:1087)
    at javafx.scene.Parent.layout(Parent.java:1093)
    at javafx.scene.Parent.layout(Parent.java:1093)
    at javafx.scene.Parent.layout(Parent.java:1093)
    at javafx.scene.Scene.doLayoutPass(Scene.java:552)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2397)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:398)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:397)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:424)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:518)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:498)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:491)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:319)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
    at com.sun.glass.ui.gtk.GtkApplication.lambda$null$5(GtkApplication.java:139)
    at java.lang.Thread.run(Thread.java:748)

dove sbaglio secondo voi??

[fermat]

risolto, da quanto ho capito ha bisogno di un URI.
così funziona:

@FXML
private void openDirectory() {
    images = ListImages.getImages(new File(System.getProperty("user.home") + "/1_TEST_PHOTO"), getStage());
    ObservableList<String> items = FXCollections.observableArrayList(images);
    listViewImages.setItems(items);
    listViewImages.setCellFactory(param -> new ListCell<String>() {
        private ImageView imageView = new ImageView();

        @Override
public void updateItem(String item, boolean empty) {
            super.updateItem(item, empty);
            if (empty || item == null) {
                imageView.setImage(null);
                setGraphic(null);
                setText(null);
            } else {
                imageView.setImage(new Image(new File(item).toURI().toString(), 0, 50, true, true));
                setGraphic(imageView);
                //setText(item);
}
        }
    });
}