java.lang.NullPointerException

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!

tip

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

You have a different solution? A short tip here would help you and many other users who saw this issue last week.

  • NullPointerException on setMenuVisibility
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  • FragmentStatePagerAdapter Error
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    • java.lang.NullPointerException 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:103) at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:1003) at android.support.v4.view.ViewPager.populate(ViewPager.java:1151) at android.support.v4.view.ViewPager.populate(ViewPager.java:1085) at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1611) at android.view.View.measure(View.java:17331) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376) at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:671) at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90) at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1319) at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:736) at android.view.View.measure(View.java:17331) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376) at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) at android.view.View.measure(View.java:17331) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410) at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) at android.view.View.measure(View.java:17331) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376) at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) at android.view.View.measure(View.java:17331) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410) at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) at android.view.View.measure(View.java:17331) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376) at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2548) at android.view.View.measure(View.java:17331) at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2279) at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1393) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1592) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1251) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6540) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:813) at android.view.Choreographer.doCallbacks(Choreographer.java:613) at android.view.Choreographer.doFrame(Choreographer.java:583) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:799) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:146) at android.app.ActivityThread.main(ActivityThread.java:5593) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) at dalvik.system.NativeStart.main(Native Method)

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