更新 JavaFX ImageView 的图像？

Question

我的 JavaFX 应用程序的 Stackpane 中嵌套了一个 ImageView：

UiManager.java

 @Override
    public void start(Stage primaryStage) {
        logger.info("Starting UI...");

        //Set the application icon.
        primaryStage.getIcons().add(getImage(ICON_APPLICATION));

        try {
            mainWindow = new MainWindow(primaryStage, logic);
            mainWindow.show(); //This should be called before creating other UI parts
            mainWindow.fillInnerParts();

        } catch (Throwable e) {
            logger.severe(StringUtil.getDetails(e));
            showFatalErrorDialogAndShutdown("Fatal error during initializing", e);
        }
    }

MainWindow.java

// Independent Ui parts residing in this Ui container
private ImagePanel imagePanel;
private PersonListPanel personListPanel;
private ResultDisplay resultDisplay;
private HelpWindow helpWindow;

@FXML
private StackPane imagePlaceholder;

@FXML
private StackPane commandBoxPlaceholder;

@FXML
private MenuItem helpMenuItem;

@FXML
private StackPane personListPanelPlaceholder;

@FXML
private StackPane resultDisplayPlaceholder;

@FXML
private StackPane statusbarPlaceholder;

void fillInnerParts() {
        imagePanel = new ImagePanel();
        imagePlaceholder.getChildren().add(imagePanel.getRoot());

        personListPanel = new PersonListPanel(logic.getFilteredPersonList(), logic.selectedPersonProperty(),
                logic::setSelectedPerson);
        personListPanelPlaceholder.getChildren().add(personListPanel.getRoot());

        resultDisplay = new ResultDisplay();
        resultDisplayPlaceholder.getChildren().add(resultDisplay.getRoot());

        StatusBarFooter statusBarFooter = new StatusBarFooter(logic.getAddressBookFilePath(), logic.getAddressBook());
        statusbarPlaceholder.getChildren().add(statusBarFooter.getRoot());

        CommandBox commandBox = new CommandBox(this::executeCommand, logic.getHistory());
        commandBoxPlaceholder.getChildren().add(commandBox.getRoot());

        //imagePlaceholder.getChildren().add(imagePanel.getRoot());
    }

ImagePanel.java

public class ImagePanel extends UiPart<Region> {

    private static final String FXML = "ImagePanel.fxml";

    @FXML
    private ImageView imageView;

    public ImagePanel() {
        super(FXML);
        imageView.setImage(new Image("/assets/1.png"));
    }

    public void updateView() {
        imageView.setImage(new Image("/assets/3.png"));
    }
}

考虑到我实际上是在修改现有项目，我提取了相关部分。

在这里，我尝试创建一个单独的方法updateView()，我将在我的程序的另一个类中将其调用为new ImagePanel().updateView()

但在这种情况下，无论我怎么称呼updateView()，图像都不会改变。

Answer 1

编辑：发布此答案后问题发生了变化。

这是一个 MVCE，可以满足您的需求（启动缓慢，因为它使用 Web 资源）。
运行，然后将其与您的图像交换以验证：

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class Test extends Application{

    private static int counter =0;
    private ImageView iv;
    private Image[] images;
    private final String[] urls = {
            "https://emojipedia-us.s3.dualstack.us-west-1.amazonaws.com/thumbs/160/lg/57/tropical-fish_1f420.png",
            "https://www.shareicon.net/data/128x128/2015/03/28/14104_animal_256x256.png",
            "https://cdn1.iconfinder.com/data/icons/DarkGlass_Reworked/128x128/apps/gnome-fish.png",
            "http://www.iconsalot.com/asset/icons/freepik/pet-shop-13/128/010-fish-2-icon.png"
    };

    @Override
    public void start(Stage primaryStage) throws Exception
    {
        images = new Image[urls.length];
        for(int i=0; i< urls.length; i++) {
            images[i] = new Image(urls[i]);
        }

        iv = new ImageView(images[counter++]);
        Button swapImage = new Button("Swap Image");
        swapImage.setOnAction(e->swapImage());
        BorderPane root = new BorderPane(iv);
        root.setBottom(swapImage);
        Scene scene = new Scene(root);
        primaryStage.setScene(scene);
        primaryStage.sizeToScene();
        primaryStage.show();
    }

    private void swapImage() {
        counter = counter +1 >= images.length ? 0 : counter;
        iv.setImage(images[counter++]);
    }

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