java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.List.size()' on a null object reference

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Root Cause Analysis

  1. java.lang.NullPointerException

    Attempt to invoke interface method 'int java.util.List.size()' on a null object reference

    at android.widget.ArrayAdapter.getCount()
  2. Android Platform
    ActivityThread.main
    1. android.widget.ArrayAdapter.getCount(ArrayAdapter.java:330)
    2. android.widget.AdapterView.checkFocus(AdapterView.java:947)
    3. android.widget.AdapterView$AdapterDataSetObserver.onInvalidated(AdapterView.java:1070)
    4. android.widget.AbsListView$AdapterDataSetObserver.onInvalidated(AbsListView.java:8297)
    5. android.database.DataSetObservable.notifyInvalidated(DataSetObservable.java:50)
    6. android.widget.BaseAdapter.notifyDataSetInvalidated(BaseAdapter.java:59)
    7. android.widget.ArrayAdapter$ArrayFilter.publishResults(ArrayAdapter.java:513)
    8. android.widget.Filter$ResultsHandler.handleMessage(Filter.java:282)
    9. android.os.Handler.dispatchMessage(Handler.java:102)
    10. android.os.Looper.loop(Looper.java:145)
    11. android.app.ActivityThread.main(ActivityThread.java:6939)
    11 frames
  3. Java RT
    Method.invoke
    1. java.lang.reflect.Method.invoke(Native Method)
    2. java.lang.reflect.Method.invoke(Method.java:372)
    2 frames
  4. Android
    ZygoteInit.main
    1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
    2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
    2 frames