JavaFX刷新警报

Question

你好，我有一个应用程序有警报，在用户没有响应后，我想刷新警报/再次显示它，但由于某些原因，我没有看到第二个警报，它是空的，像：

我关闭警报，如果它显示，所以我不知道为什么下一个警报是空的。包装应用；

//imports

public class Main extends Application{

    int number = 50;
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        alertMethod();
    }


    private void alertMethod() {
        number += number + 10;
        Alert alert = new Alert(Alert.AlertType.CONFIRMATION);
        alert.setTitle("Title");
        alert.setHeaderText("Number " + number);
        alert.setContentText("Choose your option.");     

        ButtonType buttonTypeOne = new ButtonType("Yes");
        ButtonType buttonTypeCancel = new ButtonType("No", ButtonBar.ButtonData.CANCEL_CLOSE);
        alert.getButtonTypes().setAll(buttonTypeOne, buttonTypeCancel);

        Thread newThread = new Thread(new Runnable() {
            @Override
                public void run() {
                    try {
                        Thread.sleep(2000);
                    } catch (InterruptedException ex) {
                        Thread.currentThread().interrupt();
                    }

                    Platform.runLater(new Runnable() {
                        @Override
                        public void run() {
                            if(alert.isShowing()) {
                                alert.close();
                            }
                            alertMethod();
                        }
                        });
                    }
            });
            newThread.start();
        Optional<ButtonType> result = alert.showAndWait();
        if (result.get() == buttonTypeOne){
            System.out.println("Pressed Yes");
         } else if (result.get() == buttonTypeCancel) {
            System.out.println("Pressed No");
         }
    }
}

Answer 1

这只是对我认为你想要什么的猜测。你的问题不是很清楚。这个应用程序从这里使用@Sergey Grinev代码。它每两秒钟更新一次警报。

//imports
import java.util.Optional;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.control.Alert;
import javafx.scene.control.ButtonBar;
import javafx.scene.control.ButtonType;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Main extends Application
{

    int number = 50;

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

    @Override
    public void start(Stage primaryStage) throws Exception
    {
        alertMethod();
    }

    private void alertMethod()
    {

        Alert alert = new Alert(Alert.AlertType.CONFIRMATION);
        alert.setTitle("Title");
        alert.setHeaderText("Number " + number);
        alert.setContentText("Choose your option.");

        ButtonType buttonTypeOne = new ButtonType("Yes");
        ButtonType buttonTypeCancel = new ButtonType("No", ButtonBar.ButtonData.CANCEL_CLOSE);
        alert.getButtonTypes().setAll(buttonTypeOne, buttonTypeCancel);

        Timeline twoSecondsWonder = new Timeline(new KeyFrame(Duration.seconds(2), new EventHandler<ActionEvent>()
        {
            @Override
            public void handle(ActionEvent event)
            {
                number = number + 10;
                alert.setAlertType(Alert.AlertType.CONFIRMATION);
                alert.setTitle("Title -> " + number);
                alert.setHeaderText("Number " + number);
                alert.setContentText("Choose your option.");
            }
        }));
        twoSecondsWonder.setCycleCount(Timeline.INDEFINITE);
        twoSecondsWonder.play();

        Optional<ButtonType> result = alert.showAndWait();
        if (result.get() == buttonTypeOne) {
            System.out.println("Pressed Yes");
        }
        else if (result.get() == buttonTypeCancel) {
            System.out.println("Pressed No");
        }
    }
}