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Accepted
Yuri
Asked:2022-06-15 22:52:00 +0000 UTC2022-06-15 22:52:00 +0000 UTC

JavaFX中的倒数计时器[关闭]

  • 772

需要在 JavaFX 中做一个 1 分钟的倒计时。我在 Java 中搜索了倒数计时器，我试过了，但它给出了一个错误，它不在 FX 流中。stackoverflow 上有一个答案，但没有使用它。怎样成为？Thread.sleep(1000) 根本不是一个选项。

解决了一个问题：

private void startTimer() {
    startTimer.play();
    if(!timerActivated) {
        timerWorking.play();
        timerActivated = true;
        for (int i = 59; i >= 0; i--) {
            int finalI = i;
            KeyFrame f = new KeyFrame(Duration.millis((i) * 1000),
                    ae -> timeCount.setText(String.valueOf(59 - finalI)));
            timeline.getKeyFrames().add(f);
        }
        timeline.setCycleCount(1);
        timeline.setOnFinished(ae -> timerWorking.stop());
        timeline.play();
    } else {
        timerActivated = false;
        startTimer();
    }
}
java javafx

1 个回答

  1. Best Answer

    基于此答案的变体使用Timeline.

    import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.StackPane;
import javafx.scene.text.Font;
import javafx.stage.Stage;
import javafx.util.Duration;

public class SimpleTimerApp extends Application {

    @Override
    public void start(Stage stage) {

        var root = new StackPane();
        var countDownSeconds = 60;
        var seconds = new SimpleIntegerProperty(countDownSeconds);

        var remainingTime = new Label();
        remainingTime.setFont(Font.font(40));
        remainingTime.textProperty().bind(seconds.asString());

        var timeLine = new Timeline(
                new KeyFrame(Duration.seconds(1), action ->
                        seconds.set(seconds.intValue() - 1))
        );
        timeLine.setCycleCount(countDownSeconds);

        var startBtn = new Button("Пуск (" + countDownSeconds + " с.)");
        startBtn.setOnAction(action -> {
            timeLine.play();
            root.getChildren().setAll(remainingTime);
        });

        root.getChildren().add(startBtn);
        stage.setScene(new Scene(root, 250, 200));
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}
    • 0

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