java.lang.NullPointerException: Attempt to invoke interface method 'com.scwang.smart.refresh.layout.api.RefreshKernel com.scwang.smart.refresh.layout.api.RefreshKernel.onAutoRefreshAnimationEnd(android.animation.Animator, boolean)' on a null object reference
at com.scwang.smart.refresh.header.MaterialHeader$1.onAnimationEnd(MaterialHeader.java:397)
at android.view.ViewPropertyAnimator$AnimatorEventListener.onAnimationEnd(ViewPropertyAnimator.java:1112)
at android.animation.Animator$AnimatorListener.onAnimationEnd(Animator.java:584)
at android.animation.ValueAnimator.endAnimation(ValueAnimator.java:1257)
at android.animation.ValueAnimator.doAnimationFrame(ValueAnimator.java:1516)
at android.animation.AnimationHandler.doAnimationFrame(AnimationHandler.java:272)
at android.animation.AnimationHandler.access$100(AnimationHandler.java:39)
at android.animation.AnimationHandler$1.doFrame(AnimationHandler.java:79)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1597)
at android.view.Choreographer.doCallbacks(Choreographer.java:1263)
at android.view.Choreographer.lambda$new$0$Choreographer(Choreographer.java:281)
at android.view.Choreographer$$ExternalSyntheticLambda0.run(Unknown Source:2)
at android.os.Handler.handleCallback(Handler.java:966)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loopOnce(Looper.java:205)
at android.os.Looper.loop(Looper.java:293)
at android.app.ActivityThread.loopProcess(ActivityThread.java:9986)
at android.app.ActivityThread.main(ActivityThread.java:9975)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:586)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1240)
java.lang.NullPointerException: Attempt to invoke interface method 'com.scwang.smart.refresh.layout.api.RefreshKernel com.scwang.smart.refresh.layout.api.RefreshKernel.onAutoRefreshAnimationEnd(android.animation.Animator, boolean)' on a null object reference at com.scwang.smart.refresh.header.MaterialHeader$1.onAnimationEnd(MaterialHeader.java:397) at android.view.ViewPropertyAnimator$AnimatorEventListener.onAnimationEnd(ViewPropertyAnimator.java:1112) at android.animation.Animator$AnimatorListener.onAnimationEnd(Animator.java:584) at android.animation.ValueAnimator.endAnimation(ValueAnimator.java:1257) at android.animation.ValueAnimator.doAnimationFrame(ValueAnimator.java:1516) at android.animation.AnimationHandler.doAnimationFrame(AnimationHandler.java:272) at android.animation.AnimationHandler.access$100(AnimationHandler.java:39) at android.animation.AnimationHandler$1.doFrame(AnimationHandler.java:79) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1597) at android.view.Choreographer.doCallbacks(Choreographer.java:1263) at android.view.Choreographer.lambda$new$0$Choreographer(Choreographer.java:281) at android.view.Choreographer$$ExternalSyntheticLambda0.run(Unknown Source:2) at android.os.Handler.handleCallback(Handler.java:966) at android.os.Handler.dispatchMessage(Handler.java:110) at android.os.Looper.loopOnce(Looper.java:205) at android.os.Looper.loop(Looper.java:293) at android.app.ActivityThread.loopProcess(ActivityThread.java:9986) at android.app.ActivityThread.main(ActivityThread.java:9975) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:586) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1240)