java - 代号一container.revalidate()有时会抛出IndexOutOfBoundsException

Question

我就遇到过这样的问题。当我在容器上调用 .revalidate 时，出现 IndexOutOfBoundsException。

我有一个 Runnable 类，它可以增加或减少组件的边距。我用它来制作抽屉动画。除了这个异常(exception)之外，一切都运行良好。 Ans 异常是随机抛出的。在将此异常记录到控制台之前，我可以多次运行“动画”方法。

在该异常之后，应用程序运行正常。仅容器显示不正确。

这是错误日志:

Exception in thread "Thread-15" java.lang.IndexOutOfBoundsException: Index: 5, Size: 1
at java.util.ArrayList.rangeCheck(ArrayList.java:635)
at java.util.ArrayList.get(ArrayList.java:411)
at com.codename1.ui.Container.getComponentAt(Container.java:1083)
at com.codename1.ui.Container.doLayout(Container.java:1054)
at com.codename1.ui.Container.layoutContainer(Container.java:1043)
at com.codename1.ui.Container.doLayout(Container.java:1056)
at com.codename1.ui.Container.layoutContainer(Container.java:1043)
at com.codename1.ui.Container.doLayout(Container.java:1056)
at com.codename1.ui.Container.layoutContainer(Container.java:1043)
at com.codename1.ui.Container.doLayout(Container.java:1056)
at com.codename1.ui.Container.layoutContainer(Container.java:1043)
at com.codename1.ui.Container.revalidate(Container.java:835)
at util.classes.AnimationRunnable.run(AnimationRunnable.java:75)
at java.lang.Thread.run(Thread.java:745)

为什么会这样？可能是什么问题？

谢谢!

更新:这是我的可运行类:

删除了不必要的代码:

public class AnimationRunnable implements Runnable {
private float marginFrom = 0;
private float marginTo = 0;
private Container bottomContainer;
private int screenHeight;

public AnimationRunnable(Container bottomContainer, int screenHeight, float marginFrom, float marginTo) {
    this.marginFrom = marginFrom;
    this.marginTo = marginTo;
    this.bottomContainer = bottomContainer;
    this.screenHeight = screenHeight;
}

@Override
public void run() {
    boolean finished = false;
    boolean directionUp = marginFrom > marginTo; // true = up; false = down
    Container parent = bottomContainer.getParent();

    while (!finished) {
    // if distance between current margin and destination margin is < 10, finish
        if (Math.abs(marginFrom - marginTo) < 10) {
            finished = true;
        } else {
            // if container size is increasing
            if (directionUp) {
                // if current margin is less than destination margin
                if (marginFrom <= marginTo) {
                    marginFrom = marginTo;
                    finished = true;
                } else {
                // else - modify current margin to be closer to destination margin
                    marginFrom -= Math.ceil((marginFrom - marginTo) / 6);
                }
            } else {
                // if current margin is less than destination margin
                if (marginFrom >= marginTo) {
                    marginFrom = marginTo;
                    finished = true;
                } else {
                // else - modify current margin to be closer to destination margin
                    marginFrom += Math.ceil((marginTo - marginFrom) / 6);
                }
            }
        }

        // Setting style to container (in case if container's current style is changed)
        Style defaultStyle = bottomContainer.getStyle();
        bottomContainer.getStyle().setMargin(Component.TOP, Math.round(marginFrom));
        // Setting default style to all container states

        // HERE EXCEPTION IS THROWN
        // Revalidating either parent, or container itself
        if (parent != null) {
            parent.revalidate();
            parent.repaint();
        } else {
            bottomContainer.revalidate();
            bottomContainer.repaint();
        }

        try {
        // Wait 25ms to make animation smooth
            Thread.sleep(25);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    // revalidate once more after loop is over
    if (parent != null) {
        parent.revalidate();
        parent.repaint();
    } else {
        bottomContainer.revalidate();
        bottomContainer.repaint();
    }
    return;
}
}

更新

CallSerially 不显示动画，它只是等待，并在动画可运行时更新 UI。但是使用此动画可运行调用 Display.geInstance().invokeAndBlock() 可以按需要正常工作，不会引发异常。

Answer 1

您正在更改 UI，而不是在 EDT 上，这可能会导致您正在运行的线程与 EDT(事件调度线程)之间出现问题和冲突。