NullPointerException - Drawable.setBounds - 可能是由于片段转换 [英] NullPointerException - Drawable.setBounds - probably due to fragment transitions

问题描述

我收到以下错误，但我不知道为什么（此错误非常罕见且无法重现）：

I'm getting following error and I don't know why (this error is VERY RARE and not reproducable for me):

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.graphics.drawable.Drawable.setBounds(int, int, int, int)' on a null object reference
at android.widget.ImageView.animateTransform(ImageView.java:1126)
at android.transition.ChangeImageTransform$2.set(ChangeImageTransform.java:64)
at android.transition.ChangeImageTransform$2.set(ChangeImageTransform.java:61)
at android.animation.PropertyValuesHolder.setAnimatedValue(PropertyValuesHolder.java:938)
at android.animation.ObjectAnimator.animateValue(ObjectAnimator.java:952)
at android.animation.ValueAnimator.animationFrame(ValueAnimator.java:1207)
at android.animation.ValueAnimator.doAnimationFrame(ValueAnimator.java:1248)
at android.animation.ValueAnimator$AnimationHandler.doAnimationFrame(ValueAnimator.java:659)
at android.animation.ValueAnimator$AnimationHandler.run(ValueAnimator.java:682)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.view.Choreographer.doCallbacks(Choreographer.java:580)
at android.view.Choreographer.doFrame(Choreographer.java:549)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:211)
at android.app.ActivityThread.main(ActivityThread.java:5321)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1016)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:811)

我认为它与android 片段和活动过境离子，但我不确定......上面是完整的堆栈跟踪。

I think it has to do with the android Fragment and Activity transitions, but I'm not sure... The above is the complete stacktrace.

也许有趣，我正在使用 support-library

Maybe interesting, I'm using the support-library

有没有人知道它来自哪里以及如何防止它？

Does anyone have an idea where this comes from and how I can prevent it?

编辑

如评论中所述：

• 我不知道此异常来自哪个代码块


• 我自己没有动画


• 我认为，这个问题来自片段之间的交易（我在我的应用中使用的唯一动画）

• I don't know from which code block this exception comes from
• I don't animate anything myself
• I assume, this problem comes from transactions between fragments (the only animations I use in my app)

EDIT2

我不知道我必须确保 ImageView 确实有内容。这可能会导致上述错误， ImageView 还没有图像。

I did not know that I have to make sure an ImageView does have a content. This may lead to the above error, an ImageView that does not have an image yet.

推荐答案

片段或活动转换试图为没有可绘制集的ImageView设置动画。使用ChangeImageTransform（或禁用此类动画）为其设置动画时，确保您的ImageView始终具有Drawable设置

A Fragment or Activity transition is trying to animate an ImageView which has no drawable set. Ensure you always have a Drawable set for your ImageView when you animate it with ChangeImageTransform (or disable this kind of animation)

这篇关于NullPointerException - Drawable.setBounds - 可能是由于片段转换的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！