java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference

Stack Overflow | Jaka Basej | 2 months ago
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  1. 0

    How to change TextView in fragment in on create or when a button is called

    Stack Overflow | 2 months ago | Jaka Basej
    java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference
  2. 0
    samebug tip
    When you use findViewById inside an activity it is going to look for a View inside your main_activity.xml. If it's not there, it throws this exception, try to use the right view to call findviewById.
  3. 0
    samebug tip
    If you're using nested fragments, you have to use childFragmentManager instead of fragmentManager.
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  5. 0
    samebug 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!
  6. 0
    samebug 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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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference

      at youtube.demo.youtubedemo.Fragments.Calculator_list.Calculator_list.onCreate()
    2. youtube.demo.youtubedemo
      Calculator_list.onCreate
      1. youtube.demo.youtubedemo.Fragments.Calculator_list.Calculator_list.onCreate(Calculator_list.java:47)
      1 frame
    3. Android Platform
      ActivityThread.main
      1. android.app.Fragment.performCreate(Fragment.java:2335)
      2. android.app.FragmentManagerImpl.moveToState(FragmentManager.java:949)
      3. android.app.BackStackRecord.setLastIn(BackStackRecord.java:857)
      4. android.app.BackStackRecord.calculateFragments(BackStackRecord.java:897)
      5. android.app.BackStackRecord.run(BackStackRecord.java:727)
      6. android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1578)
      7. android.app.FragmentManagerImpl$1.run(FragmentManager.java:483)
      8. android.os.Handler.handleCallback(Handler.java:751)
      9. android.os.Handler.dispatchMessage(Handler.java:95)
      10. android.os.Looper.loop(Looper.java:154)
      11. android.app.ActivityThread.main(ActivityThread.java:6077)
      11 frames
    4. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      1 frame
    5. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
      2 frames