主页 / 问题 / 1402305
Accepted
Alerto
Asked:2022-06-21 04:11:22 +0800 CST2022-06-21 04:11:22 +0800 CST

在 Javafx 线程中打开新场景

  • 772

有一个代码可以启动其他代码并在进度条中显示这些代码的执行级别。它发生在void initialize(){...}

 void initialize() throws IOException {
     new Thread(() -> {
         try {
             map_8_8.SetZero();
         } catch (IOException e) {
             e.printStackTrace();
         }
         Platform.runLater(() -> bar.setProgress( bar.getProgress() + 0.33 ));
         try {
             map_8_8.Bomb();
         } catch (IOException e) {
             e.printStackTrace();
         }
         Platform.runLater(() -> bar.setProgress( bar.getProgress() + 0.33 ));
         try {
             map_8_8.GetBoxValue();
         } catch (IOException e) {
             e.printStackTrace();
         }
         Platform.runLater(() -> bar.setProgress(1));
     }).start();

填充进度条后，应该加载另一个场景，您可以替换它，例如在最后一段中：

    @FXML
    void initialize() throws IOException {
        new Thread(() -> {
            try {
                map_8_8.SetZero();
            } catch (IOException e) {
                e.printStackTrace();
            }
            Platform.runLater(() -> bar.setProgress( bar.getProgress() + 0.33 ));
            try {
                map_8_8.Bomb();
            } catch (IOException e) {
                e.printStackTrace();
            }
            Platform.runLater(() -> bar.setProgress( bar.getProgress() + 0.33 ));
            try {
                map_8_8.GetBoxValue(); // запуск кода после выполнения последнего которого я запускаю другую сцену
                try {
                    Parent root = FXMLLoader.load(Objects.requireNonNull(getClass().getResource("8X8.fxml")));
                    Stage window = (Stage) bar.getScene().getWindow();
                    window.setScene(new Scene(root, 600, 400));
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            Platform.runLater(() -> bar.setProgress(1));
        }).start();
      
    }

但抛出错误：

java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-3
    at javafx.graphics/com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:292)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:446)
    at javafx.graphics/javafx.stage.Stage.setScene(Stage.java:265)
    at com.example.javasapp/com.example.javasapp.load_8_8.lambda$initialize$3(load_8_8.java:48)
    at java.base/java.lang.Thread.run(Thread.java:831)

我怎样才能解决这个问题或在没有这个错误的情况下达到预期的结果？

java javafx

1 个回答

  1. Best Answer

    完整版在这里https://github.com/Platence/TaskProgressBar/tree/main/src/sample 一个使用Task类的例子

     public class ProcessingBar extends Task<Void> {

    private ProgressBar progressBar;
    private static final double MAX_VALUE = 1.0D;

    public ProcessingBar(ProgressBar progressBar) {
        this.progressBar = progressBar;
    }

    @Override
    protected Void call() throws Exception {

        // Есть ещё вариант с методом bind
        // Например
        // progressBar.progressProperty().bind(this.progressProperty());

        double startValue = 0D;
        System.out.println("start");
        while (startValue<MAX_VALUE){
            Thread.sleep(1000);
            setValue(startValue+=0.1D);
            System.out.println("Change Bar");
        }
        return null;
    }

    private void setValue(double value){
        Platform.runLater(()->{this.progressBar.setProgress(value);});
    }




}

    来自控制器的代码

        public class Controller {

    @FXML
    private AnchorPane mainPane;

    public void initialize() {
        ProgressBar pb = new ProgressBar();
        pb.setLayoutY(10);
        pb.setLayoutX(10);

        ProgressBar pb2 = new ProgressBar();
        pb2.setLayoutY(30);
        pb2.setLayoutX(30);


        Platform.runLater(() ->
                {
                    mainPane.getChildren().add(pb);
                    mainPane.getChildren().add(pb2);
                }
        );

        Thread t1 = new Thread(new ProcessingBar(pb));
        Thread t2 = new Thread(new ProcessingBar(pb2));
        t1.setDaemon(true);t2.setDaemon(true);
        t1.start();
        t2.start();

    }
}
    • 1

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