java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.GridView.setAdapter(android.widget.ListAdapter)' on a null object reference

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    Implementation of GridView in android Fragment

    Stack Overflow | 4 months ago | Lukas Rasmus Nielsen
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.GridView.setAdapter(android.widget.ListAdapter)' on a null object reference

    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void android.widget.GridView.setAdapter(android.widget.ListAdapter)' on a null object reference

      at tryouts.demoapplication.recFragment.onAttach()
    2. tryouts.demoapplication
      recFragment.onAttach
      1. tryouts.demoapplication.recFragment.onAttach(recipesFragment.java:42)
      1 frame
    3. Android Support v4
      ViewPager$3.run
      1. android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1019)
      2. android.support.v4.app.BackStackRecord.ensureFragmentsAreInitialized(BackStackRecord.java:1077)
      3. android.support.v4.app.BackStackRecord.beginTransition(BackStackRecord.java:1032)
      4. android.support.v4.app.BackStackRecord.run(BackStackRecord.java:658)
      5. android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617)
      6. android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:570)
      7. android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
      8. android.support.v4.view.ViewPager.populate(ViewPager.java:1177)
      9. android.support.v4.view.ViewPager.populate(ViewPager.java:1025)
      10. android.support.v4.view.ViewPager$3.run(ViewPager.java:254)
      10 frames
    4. Android Platform
      ActivityThread.main
      1. android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
      2. android.view.Choreographer.doCallbacks(Choreographer.java:670)
      3. android.view.Choreographer.doFrame(Choreographer.java:603)
      4. android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
      5. android.os.Handler.handleCallback(Handler.java:739)
      6. android.os.Handler.dispatchMessage(Handler.java:95)
      7. android.os.Looper.loop(Looper.java:148)
      8. android.app.ActivityThread.main(ActivityThread.java:5417)
      8 frames
    5. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      1 frame
    6. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
      2 frames