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 | 7 months ago
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  1. 0

    Getting null error in android tab project

    Stack Overflow | 7 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 | 7 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 | 1 year 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

    java.lang.Class java.lang.Object.getClass()' on a null object reference

    Stack Overflow | 2 months ago | xyz rety
    java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
  6. 0

    Failed while using in fragment

    GitHub | 2 years 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

  1. filpgame 11 times, last 3 months ago
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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