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

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【CrashLog】 LogReport 2016-07-30 14:28:38:27

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

【CrashLog】 LogReport 2016-09-12 09:41:26:05

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

【CrashLog】 LogReport 2016-07-30 14:33:57:30

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

【CrashLog】 LogReport 2016-08-03 18:23:22:19

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

【CrashLog】 LogReport 2016-08-29 12:51:21:19

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

【CrashLog】 LogReport 2016-09-12 09:32:20:20

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

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)