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Samebug tips

  1. ,
    Expert tip

    Check if you imported android.support.v4.app.FragmentManager and not android.app.FragmentManager. Check for naming problems in your xml files as well, might have inconsistencies!

  2. ,
    Expert tip

    Also, check if you're not using android.support.v4.app.FragmentTransaction with android.app.Fragment, as they're not totally compatible.

Solutions on the web

via Stack Overflow by Kushal Patil
, 1 year ago
Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference
via Stack Overflow by Kushal Patil
, 1 year ago
Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference
via Stack Overflow by Gsingh
, 1 year ago
Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
via stackoverflow.com by Unknown author, 1 year ago
Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference
via compoune.com by Unknown author, 2 years ago
Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference
via databasefaq.com by Unknown author, 2 years ago
Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference
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(BackStackRecord.java:418)	at android.support.v4.app.BackStackRecord.add(BackStackRecord.java:413)	at android.support.v4.app.FragmentPagerAdapter.instantiateItem(FragmentPagerAdapter.java:99)	at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:943)	at android.support.v4.view.ViewPager.populate(ViewPager.java:1157)	at android.support.v4.view.ViewPager.populate(ViewPager.java:1025)	at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1545)	at android.view.View.measure(View.java:18788)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)	at android.view.View.measure(View.java:18788)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)	at android.view.View.measure(View.java:18788)	at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1075)	at android.view.View.measure(View.java:18788)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)	at android.view.View.measure(View.java:18788)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)	at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)	at android.view.View.measure(View.java:18788)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)	at android.view.View.measure(View.java:18788)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)	at android.view.View.measure(View.java:18788)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)	at android.view.View.measure(View.java:18788)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)	at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2643)	at android.view.View.measure(View.java:18788)	at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2100)	at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1216)	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1452)	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)	at android.view.Choreographer.doCallbacks(Choreographer.java:670)	at android.view.Choreographer.doFrame(Choreographer.java:606)	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:148)	at android.app.ActivityThread.main(ActivityThread.java:5417)