java.lang.NullPointerException

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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.

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  • Changing fragment with click on imagebutton
    via Stack Overflow by Ayush
    ,
  • Fragment overriding error
    via Stack Overflow by James
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  • Nullpointer Exception
    via GitHub by mradzinski
    ,
    • 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:408) at com.psycho.ayush.sahanubhooti_20.MainActivity$1.onClick(MainActivity.java:30) at android.view.View.performClick(View.java:4756) at android.view.View$PerformClick.run(View.java:19761) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5253) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

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