Question

我遇到了这样的问题。当我在容器上调用.revalidate时，我得到了IndexOutOfBoundsException。

我有一个Runnable类，可以增加或减少组件的边距。我用它来制作一种抽屉动画。除了这个例外，一切都很完美。 Ans随机抛出异常。在将此异常记录到控制台之前，我可以多次运行“动画”方法。

在此之后，应用程序正常运行。只有容器显示不正确。

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！

UPD：这是我的runnable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

当动画可运行时，CallSerially不显示动画，只是等待，并更新UI。但是使用这个动画runnable调用Display.geInstance（）。invokeAndBlock（）可以按需要运行而不会抛出异常。

Answer 1

您正在更改不在EDT上的UI，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。

代号为一个container.revalidate（）有时抛出IndexOutOfBoundsException

1 个答案: