java.lang.NullPointerException: Attempt to invoke virtual method 'void android.animation.Animator.removeListener(android.animation.Animator$AnimatorListener)' on a null object reference

GitHub | krystianpe | 2 months ago
  1. 0

    NPE from AnimationChangeHandler in version 2.0.2

    GitHub | 2 months ago | krystianpe
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.animation.Animator.removeListener(android.animation.Animator$AnimatorListener)' on a null object reference
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    How to debug and resolve an NPE in AnimatorListener.onAnimationEnd

    Stack Overflow | 4 months ago | user1701153
    java.lang.NullPointerException: Attempt to invoke interface method 'void android.animation.Animator$AnimatorListener.onAnimationEnd(android.animation.Animator)' on a null object reference
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    appcompat show progress in action bar causes NPE

    Stack Overflow | 2 years ago | Mark
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.internal.widget.ProgressBarCompat.setVisibility(int)' on a null object reference
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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void android.animation.Animator.removeListener(android.animation.Animator$AnimatorListener)' on a null object reference

      at com.bluelinelabs.conductor.changehandler.AnimatorChangeHandler$2.onAnimationEnd()
    2. com.bluelinelabs.conductor
      AnimatorChangeHandler$2.onAnimationEnd
      1. com.bluelinelabs.conductor.changehandler.AnimatorChangeHandler$2.onAnimationEnd(AnimatorChangeHandler.java:170)
      1 frame
    3. Android Platform
      AnimatorSet.cancel
      1. android.animation.AnimatorSet.cancel(AnimatorSet.java:327)
      1 frame
    4. com.bluelinelabs.conductor
      LifecycleHandler.onActivitySaveInstanceState
      1. com.bluelinelabs.conductor.changehandler.AnimatorChangeHandler.completeImmediately(AnimatorChangeHandler.java:77)
      2. com.bluelinelabs.conductor.ControllerChangeHandler.completePushImmediately(ControllerChangeHandler.java:106)
      3. com.bluelinelabs.conductor.Router.prepareForHostDetach(Router.java:484)
      4. com.bluelinelabs.conductor.Router.saveInstanceState(Router.java:490)
      5. com.bluelinelabs.conductor.internal.LifecycleHandler.onActivitySaveInstanceState(LifecycleHandler.java:311)
      5 frames
    5. Android Platform
      Activity.onSaveInstanceState
      1. android.app.Application.dispatchActivitySaveInstanceState(Application.java:259)
      2. android.app.Activity.onSaveInstanceState(Activity.java:1461)
      2 frames
    6. Android Support v4
      FragmentActivity.onSaveInstanceState
      1. android.support.v4.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:567)
      1 frame
    7. Android v7
      AppCompatActivity.onSaveInstanceState
      1. android.support.v7.app.AppCompatActivity.onSaveInstanceState(AppCompatActivity.java:511)
      1 frame