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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  1. 0

    Error caused by the internal android SDK

    Stack Overflow | 7 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 | 2 years 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