java.lang.NullPointerException: Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference

  1. 0

    Error caused by the internal android SDK

    Stack Overflow | 3 months ago | rising programmer
    java.lang.NullPointerException: Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference
  2. 0

    Android: 3 page splash screen using viewPager gives NullPointerException

    Stack Overflow | 1 year ago | Jack Sparrow
    java.lang.NullPointerException: Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference
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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference

      at android.support.v4.app.BackStackRecord.doAddOp()
    2. Android Support v4
      ViewPager.onMeasure
      1. android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:414)
      2. android.support.v4.app.BackStackRecord.add(BackStackRecord.java:409)
      3. android.support.v4.app.FragmentPagerAdapter.instantiateItem(FragmentPagerAdapter.java:99)
      4. android.support.v4.view.ViewPager.addNewItem(ViewPager.java:943)
      5. android.support.v4.view.ViewPager.populate(ViewPager.java:1091)
      6. android.support.v4.view.ViewPager.populate(ViewPager.java:1025)
      7. android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1545)
      7 frames
    3. Android Platform
      FrameLayout.onMeasure
      1. android.view.View.measure(View.java:18563)
      2. android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:728)
      3. android.widget.RelativeLayout.onMeasure(RelativeLayout.java:464)
      4. android.view.View.measure(View.java:18563)
      5. android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:728)
      6. android.widget.RelativeLayout.onMeasure(RelativeLayout.java:464)
      7. android.view.View.measure(View.java:18563)
      8. android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5827)
      9. android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
      9 frames
    4. Android v7
      ContentFrameLayout.onMeasure
      1. android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
      1 frame
    5. Android Platform
      FrameLayout.onMeasure
      1. android.view.View.measure(View.java:18563)
      2. android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5827)
      3. android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1435)
      4. android.widget.LinearLayout.measureVertical(LinearLayout.java:721)
      5. android.widget.LinearLayout.onMeasure(LinearLayout.java:612)
      6. android.view.View.measure(View.java:18563)
      7. android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5827)
      8. android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
      9. android.view.View.measure(View.java:18563)
      10. android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5827)
      11. android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1435)
      12. android.widget.LinearLayout.measureVertical(LinearLayout.java:721)
      13. android.widget.LinearLayout.onMeasure(LinearLayout.java:612)
      14. android.view.View.measure(View.java:18563)
      15. android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5827)
      16. android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
      16 frames
    6. Android
      PhoneWindow$DecorView.onMeasure
      1. com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2888)
      1 frame
    7. Android Platform
      ActivityThread.main
      1. android.view.View.measure(View.java:18563)
      2. android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2248)
      3. android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1306)
      4. android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1548)
      5. android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1191)
      6. android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6642)
      7. android.view.Choreographer$CallbackRecord.run(Choreographer.java:777)
      8. android.view.Choreographer.doCallbacks(Choreographer.java:590)
      9. android.view.Choreographer.doFrame(Choreographer.java:560)
      10. android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:763)
      11. android.os.Handler.handleCallback(Handler.java:739)
      12. android.os.Handler.dispatchMessage(Handler.java:95)
      13. android.os.Looper.loop(Looper.java:145)
      14. android.app.ActivityThread.main(ActivityThread.java:5938)
      14 frames
    8. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      2. java.lang.reflect.Method.invoke(Method.java:372)
      2 frames
    9. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
      2 frames