AnimationTimer - 动画处理期间不允许使用showAndWait

Question

当玩家赢得我创建的游戏时,我正在尝试显示警告对话框.但是,我得到一个例外:

java.lang.IllegalStateException: showAndWait is not allowed during animation or layout processing

我尝试添加stop()的AnimationTimer,但它没有工作,仍然抛出同样的异常:

if (ball.getBall().getCenterY() == 0) {
                //computer lost!
                stop();

                Alert alert = new Alert(Alert.AlertType.INFORMATION);
                alert.setTitle(null);
                alert.setHeaderText(null);
                alert.setContentText("Good game. You won! Click OK to exit.");

                alert.showAndWait(); //exception thrown here
                System.exit(0);
            }

Answer 1

您只能showAndWait()在事件处理程序中调用,而不能在动画中调用.这没有在Alert类中明确记录,尽管它在文档中有记录Stage.

show()相反,调用并使用onHidden警报事件处理程序在警报关闭时调用某些内容:

if (ball.getBall().getCenterY() == 0) {
    //computer lost!

    Alert alert = new Alert(Alert.AlertType.INFORMATION);
    alert.setTitle(null);
    alert.setHeaderText(null);
    alert.setContentText("Good game. You won! Click OK to exit.");

    alert.setOnHidden(evt -> Platform.exit());

    alert.show(); 
}