java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference

Stack Overflow | Grace Purcell | 7 months ago
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    background thread perform message box

    Stack Overflow | 7 months ago | Grace Purcell
    java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference

    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference

      at com.example.gmdev03.test30.Export.onCreate()
    2. com.example.gmdev03
      Export.onCreate
      1. com.example.gmdev03.test30.Export.onCreate(Export.java:161)
      1 frame
    3. Android Platform
      ActivityThread.main
      1. android.app.Activity.performCreate(Activity.java:6877)
      2. android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1136)
      3. android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3209)
      4. android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3352)
      5. android.app.ActivityThread.access$1100(ActivityThread.java:223)
      6. android.app.ActivityThread$H.handleMessage(ActivityThread.java:1797)
      7. android.os.Handler.dispatchMessage(Handler.java:102)
      8. android.os.Looper.loop(Looper.java:158)
      9. android.app.ActivityThread.main(ActivityThread.java:7231)
      9 frames
    4. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      1 frame