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
    ListView.setAdapter
    1. android.widget.ArrayAdapter.getCount(ArrayAdapter.java:330)
    2. android.widget.ListView.setAdapter(ListView.java:499)
    2 frames
  3. com.example.administrator
    MainActivity$JSONTask.onPostExecute
    1. com.example.administrator.mainpage.MainActivity$JSONTask.onPostExecute(MainActivity.java:56)
    2. com.example.administrator.mainpage.MainActivity$JSONTask.onPostExecute(MainActivity.java:41)
    2 frames
  4. Android Platform
    ActivityThread.main
    1. android.os.AsyncTask.finish(AsyncTask.java:636)
    2. android.os.AsyncTask.access$500(AsyncTask.java:177)
    3. android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:653)
    4. android.os.Handler.dispatchMessage(Handler.java:111)
    5. android.os.Looper.loop(Looper.java:194)
    6. android.app.ActivityThread.main(ActivityThread.java:5649)
    6 frames
  5. Java RT
    Method.invoke
    1. java.lang.reflect.Method.invoke(Native Method)
    2. java.lang.reflect.Method.invoke(Method.java:372)
    2 frames
  6. Android
    ZygoteInit.main
    1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)
    2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)
    2 frames