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.wenming.crashcachedemo.MainActivity$1.onClick(MainActivity.java:42) at android.view.View.performClick(View.java:5197) at android.view.View$PerformClick.run(View.java:20909) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:145) at android.app.ActivityThread.main(ActivityThread.java:5942) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)

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