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

Stack Overflow | jaume5900 | 8 months ago
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    Null object reference with XML file

    Stack Overflow | 8 months ago | jaume5900
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Spinner.setAdapter(android.widget.SpinnerAdapter)' on a null object reference

    Root Cause Analysis

    1. java.lang.NullPointerException

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

      at com.example.jaume5900.notphone.MainActivity$2.onItemClick()
    2. com.example.jaume5900
      MainActivity$2.onItemClick
      1. com.example.jaume5900.notphone.MainActivity$2.onItemClick(MainActivity.java:123)
      1 frame
    3. Android Platform
      ActivityThread.main
      1. android.widget.AdapterView.performItemClick(AdapterView.java:310)
      2. android.widget.AbsListView.performItemClick(AbsListView.java:1145)
      3. android.widget.AbsListView$PerformClick.run(AbsListView.java:3042)
      4. android.widget.AbsListView$3.run(AbsListView.java:3879)
      5. android.os.Handler.handleCallback(Handler.java:739)
      6. android.os.Handler.dispatchMessage(Handler.java:95)
      7. android.os.Looper.loop(Looper.java:148)
      8. android.app.ActivityThread.main(ActivityThread.java:5417)
      8 frames
    4. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      1 frame
    5. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
      2 frames