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

Stack Overflow | Mudit | 9 months ago
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    App crash while using tabbed activity and fragments

    Stack Overflow | 9 months ago | Mudit
    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$3.run
    1. android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:418)
    2. android.support.v4.app.BackStackRecord.add(BackStackRecord.java:413)
    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:1157)
    6. android.support.v4.view.ViewPager.populate(ViewPager.java:1025)
    7. android.support.v4.view.ViewPager$3.run(ViewPager.java:254)
    7 frames
  3. Android Platform
    ActivityThread.main
    1. android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
    2. android.view.Choreographer.doCallbacks(Choreographer.java:580)
    3. android.view.Choreographer.doFrame(Choreographer.java:549)
    4. android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
    5. android.os.Handler.handleCallback(Handler.java:739)
    6. android.os.Handler.dispatchMessage(Handler.java:95)
    7. android.os.Looper.loop(Looper.java:135)
    8. android.app.ActivityThread.main(ActivityThread.java:5343)
    8 frames
  4. Java RT
    Method.invoke
    1. java.lang.reflect.Method.invoke(Native Method)
    2. java.lang.reflect.Method.invoke(Method.java:372)
    2 frames
  5. Android
    ZygoteInit.main
    1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
    2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
    2 frames