java.lang.NullPointerException

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

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

    • 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(Export.java:161) at android.app.Activity.performCreate(Activity.java:6877) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1136) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3209) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3352) at android.app.ActivityThread.access$1100(ActivityThread.java:223) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1797) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:158) at android.app.ActivityThread.main(ActivityThread.java:7231) at java.lang.reflect.Method.invoke(Native Method)

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