java.lang.RuntimeException

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  • My app crashes when go into an activity
    via Stack Overflow by angela
    ,
    • java.lang.RuntimeException: Unable to start activity ComponentInfo{ie.example.artur.projectrepeat/ie.example.artur.projectrepeat.DataListActivity}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2363) at android.app.ActivityThread.access$900(ActivityThread.java:161) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:157) at android.app.ActivityThread.main(ActivityThread.java:5356) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at ie.example.artur.projectrepeat.DataListActivity.onCreate(DataListActivity.java:30) at android.app.Activity.performCreate(Activity.java:5426) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)
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