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 | Kushal Patil | 3 months ago
  1. 0

    Getting null error in android tab project

    Stack Overflow | 3 months ago | Kushal Patil
    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

    FragmentManager on a null object reference

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

    void android.support.v4.app.Fragment.setMenuVisibility(boolean)' on a null object reference

    Stack Overflow | 9 months ago | Sagar Chavada
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.app.Fragment.setMenuVisibility(boolean)' on a null object reference
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  5. 0

    Failed while using in fragment

    GitHub | 1 year ago | virtual46
    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: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.onMeasure(ViewPager.java:1545)
      7 frames
    3. Android Platform
      View.measure
      1. android.view.View.measure(View.java:18788)
      2. android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
      3. android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
      4. android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
      5. android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
      6. android.view.View.measure(View.java:18788)
      7. android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
      8. android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
      9. android.view.View.measure(View.java:18788)
      9 frames
    4. Android Support v4
      DrawerLayout.onMeasure
      1. android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1075)
      1 frame
    5. Android Platform
      FrameLayout.onMeasure
      1. android.view.View.measure(View.java:18788)
      2. android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
      3. android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
      4. android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
      5. android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
      6. android.view.View.measure(View.java:18788)
      7. android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
      8. android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
      8 frames
    6. Android v7
      ContentFrameLayout.onMeasure
      1. android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
      1 frame
    7. Android Platform
      FrameLayout.onMeasure
      1. android.view.View.measure(View.java:18788)
      2. android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
      3. android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
      4. android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
      5. android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
      6. android.view.View.measure(View.java:18788)
      7. android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
      8. android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
      9. android.view.View.measure(View.java:18788)
      10. android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
      11. android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
      12. android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
      13. android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
      14. android.view.View.measure(View.java:18788)
      15. android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
      16. android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
      16 frames
    8. Android
      PhoneWindow$DecorView.onMeasure
      1. com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2643)
      1 frame
    9. Android Platform
      ActivityThread.main
      1. android.view.View.measure(View.java:18788)
      2. android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2100)
      3. android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1216)
      4. android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1452)
      5. android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
      6. android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)
      7. android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
      8. android.view.Choreographer.doCallbacks(Choreographer.java:670)
      9. android.view.Choreographer.doFrame(Choreographer.java:606)
      10. android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
      11. android.os.Handler.handleCallback(Handler.java:739)
      12. android.os.Handler.dispatchMessage(Handler.java:95)
      13. android.os.Looper.loop(Looper.java:148)
      14. android.app.ActivityThread.main(ActivityThread.java:5417)
      14 frames