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

Stack Overflow | Earl Balmes | 7 months ago
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    Xamarin - MediaRouteButton ShowDialog() method throws NullPointerException (Xamarin.Android.Support.v7.MediaRouter)

    Stack Overflow | 7 months ago | Earl Balmes
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference

    Root Cause Analysis

    1. java.lang.NullPointerException

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

      at android.support.v7.app.MediaRouteChooserDialog.onCreate()
    2. Android v7
      MediaRouteChooserDialog.onCreate
      1. android.support.v7.app.MediaRouteChooserDialog.onCreate(MediaRouteChooserDialog.java:167)
      1 frame
    3. Android Platform
      Dialog.show
      1. android.app.Dialog.dispatchOnCreate(Dialog.java:465)
      2. android.app.Dialog.show(Dialog.java:288)
      2 frames
    4. Android Support v4
      FragmentManagerImpl$1.run
      1. android.support.v4.app.DialogFragment.onStart(DialogFragment.java:406)
      2. android.support.v4.app.Fragment.performStart(Fragment.java:1986)
      3. android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1102)
      4. android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1248)
      5. android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738)
      6. android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1613)
      7. android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:517)
      7 frames
    5. Android Platform
      ActivityThread.main
      1. android.os.Handler.handleCallback(Handler.java:739)
      2. android.os.Handler.dispatchMessage(Handler.java:95)
      3. android.os.Looper.loop(Looper.java:145)
      4. android.app.ActivityThread.main(ActivityThread.java:6117)
      4 frames
    6. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      2. java.lang.reflect.Method.invoke(Method.java:372)
      2 frames
    7. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
      2 frames