编舞者NullPointerException

Question

我一直在研究现有的代码库并且浏览我们的崩溃日志服务我注意到异常发生的频率非常频繁,我无法重现这个问题,我也没有为方案尝试上下文因为这是一个非常大的项目,所以越来越难以找出这个例外的原因.

我一直在网上搜索类似的问题,但找不到任何有用的信息.如果有人熟悉这个问题,我们将非常感谢您的帮助.

Stacktrace如下:

java.lang.NullPointerException
   at android.animation.PropertyValuesHolder.setupSetterAndGetter(PropertyValuesHolder.java:505)
   at android.animation.ObjectAnimator.initAnimation(ObjectAnimator.java:487)
   at android.animation.ValueAnimator.setCurrentPlayTime(ValueAnimator.java:517)
   at android.animation.ValueAnimator.start(ValueAnimator.java:936)
   at android.animation.ValueAnimator.start(ValueAnimator.java:946)
   at android.animation.ObjectAnimator.start(ObjectAnimator.java:465)
   at android.animation.AnimatorSet$1.onAnimationEnd(AnimatorSet.java:579)
   at android.animation.ValueAnimator.endAnimation(ValueAnimator.java:1056)
   at android.animation.ValueAnimator.access$400(ValueAnimator.java:50)
   at android.animation.ValueAnimator$AnimationHandler.doAnimationFrame(ValueAnimator.java:644)
   at android.animation.ValueAnimator$AnimationHandler.run(ValueAnimator.java:660)
   at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
   at android.view.Choreographer.doCallbacks(Choreographer.java:574)
   at android.view.Choreographer.doFrame(Choreographer.java:543)
   at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
   at android.os.Handler.handleCallback(Handler.java:733)
   at android.os.Handler.dispatchMessage(Handler.java:95)
   at android.os.Looper.loop(Looper.java:136)
   at android.app.ActivityThread.main(ActivityThread.java:5105)
   at java.lang.reflect.Method.invokeNative(Method.java)
   at java.lang.reflect.Method.invoke(Method.java:515)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)
   at dalvik.system.NativeStart.main(NativeStart.java)

干杯.

Answer 1

问题结果是从Handler使用中调用的动画postDelayed(),最终导致尝试动画空View引用,因为根据它的主机生命周期事件没有正确清除它.

Answer 2

也许你的 tagret 是空的，用 animatorSet.getTarget() 打印日志看看