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this is the log i receive from android studio.

08-07 07:54:57.379 10573-10573/com.sifdon.shipping E/AndroidRuntime: FATAL EXCEPTION: main Process: com.sifdon.shipping, PID: 10573 java.lang.RuntimeException: Unable to resume activity {com.sifdon.shipping/com.sifdon.shipping.DisplayActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.database.sqlite.SQLiteDatabase com.sifdon.shipping.DbHelper.getWritableDatabase()' on a null object reference at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3192) at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3223) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2471) at android.app.ActivityThread.access$1200(ActivityThread.java:152) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1341) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5538) 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:960) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.database.sqlite.SQLiteDatabase com.sifdon.shipping.DbHelper.getWritableDatabase()' on a null object reference at com.sifdon.shipping.DisplayActivity.displayData(DisplayActivity.java:157) at com.sifdon.shipping.DisplayActivity.onResume(DisplayActivity.java:149) at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1249) at android.app.Activity.performResume(Activity.java:6102) at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3167) at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3223)  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2471)  at android.app.ActivityThread.access$1200(ActivityThread.java:152)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1341)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:135)  at android.app.ActivityThread.main(ActivityThread.java:5538)  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:960)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)  08-07 07:54:57.719 10573-10573/com.sifdon.shipping I/Process: Sending signal. PID: 10573 SIG: 9

Phantômaxx
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Sifiso Tsoari
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    post your creating database section code – Saeed-rz Aug 07 '16 at 06:16
  • Welcome to the site, @Sifiso! We do really need the code that caused this error. You might also want to check out [How to Ask](http://stackoverflow.com/help/how-to-ask). – Menasheh Aug 07 '16 at 06:31

1 Answers1

0

You got NullPointerException in DisplayActivity when call

DbHelper.getWritableDatabase()'. Maybe DbHelper is empty and you can't

call any method from it.

blkrt
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