JavaFX:在splashScreen中使用Indeterminate Progressbar

Question

我有一个闪屏:

我需要有进度条的动画(Indeterminate),但它不起作用.

这可能是因为我的线程在我的initilize方法中运行.

public class splashscreenController implements Initializable {
  @Override
  public void initialize(URL location, ResourceBundle resources) {
    new SplashScreen().run();
  }

  class SplashScreen extends Task {
    @Override
    public Object call() {

        Platform.runLater(new Runnable() {
            @Override
            public void run()
                Parent root = null;
                try {
                    Thread.sleep(3000);
                    root = FXMLLoader.load(getClass().getResource("../gui/NewUI.fxml"));
                } catch (InterruptedException | IOException e) {
                    e.printStackTrace();
                }
                Stage stage = new Stage();
                stage.initStyle(StageStyle.UNDECORATED);

                assert root != null;
                Scene scene = new Scene(root, 1280, 720);
                stage.setScene(scene);
                stage.show();
                MainJavaFx.setPrimaryStage(stage);
                ((Stage) panParent.getScene().getWindow()).close();
            }
        });
        return null;
    }
  }
}

Answer 1

您的代码中有2个问题:

new SplashScreen().run();

A Task不提供在新线程上运行的功能.run在调用线程上执行.

class SplashScreen extends Task {
    @Override
    public Object call() {

        Platform.runLater(new Runnable() {
            @Override
            public void run() {
                // placeholder for parts of your code
                longRunningOperation();
                guiUpdate();
            }
        });
        return null;
    }
}

即使您在单独的线程上执行此任务,Runnable传递给Platfrom.runLater在JavaFX应用程序线程上执行,并且从此runnable执行长时间运行的操作会冻结GUI.

在后台线程上执行所有长时间运行的操作,并且仅使用Platfrom.runLater.

new Thread(new SplashScreen()).start();

class SplashScreen extends Task {
    @Override
    public Object call() throws IOException, InterruptedException {
        Thread.sleep(3000);
        final Parent root = FXMLLoader.load(getClass().getResource("../gui/NewUI.fxml"));

        Platform.runLater(new Runnable() {
            @Override
            public void run() {
                Stage stage = new Stage();
                stage.initStyle(StageStyle.UNDECORATED);

                Scene scene = new Scene(root, 1280, 720);
                stage.setScene(scene);
                stage.show();
                MainJavaFx.setPrimaryStage(stage);
                ((Stage) panParent.getScene().getWindow()).close();
            }
        });
        return null;
    }
}

请注意,由于您没有使用提供的功能Task,因此您可以简单地Runnable使用您的类来实现,而不是继承Task.