java.lang.NullPointerException: Attempt to get length of null array

Stack Overflow | user3663605 | 6 months ago
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Root Cause Analysis

  1. java.lang.NullPointerException

    Attempt to get length of null array

    at com.example.letwixtor.myapplication2.Main3Activity.ListDir()
  2. com.example.letwixtor
    Main3Activity.onPrepareDialog
    1. com.example.letwixtor.myapplication2.Main3Activity.ListDir(Main3Activity.java:117)
    2. com.example.letwixtor.myapplication2.Main3Activity.onPrepareDialog(Main3Activity.java:99)
    2 frames
  3. Android Platform
    Activity.showDialog
    1. android.app.Activity.onPrepareDialog(Activity.java:3380)
    2. android.app.Activity.showDialog(Activity.java:3444)
    3. android.app.Activity.showDialog(Activity.java:3394)
    3 frames
  4. com.example.letwixtor
    Main3Activity$1.onClick
    1. com.example.letwixtor.myapplication2.Main3Activity$1.onClick(Main3Activity.java:43)
    1 frame
  5. Android Platform
    ActivityThread.main
    1. android.view.View.performClick(View.java:5198)
    2. android.view.View$PerformClick.run(View.java:21147)
    3. android.os.Handler.handleCallback(Handler.java:739)
    4. android.os.Handler.dispatchMessage(Handler.java:95)
    5. android.os.Looper.loop(Looper.java:148)
    6. android.app.ActivityThread.main(ActivityThread.java:5417)
    6 frames
  6. Java RT
    Method.invoke
    1. java.lang.reflect.Method.invoke(Native Method)
    1 frame
  7. 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