30 why i go to the PreferenceFrahment,than start the Tabata,than save,has error?
06-29 16:41:12.251 23856-23856/pom.poly.com.tabatatimer E/AndroidRuntime: FATAL EXCEPTION: main
Process: pom.poly.com.tabatatimer, PID: 23856
java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.v4.app.FragmentManager android.support.v4.app.FragmentActivity.getSupportFragmentManager()' on a null object reference
at pom.poly.com.tabatatimer.Fragment.CalenderFragment.createAndReplayCalenderFragment(CalenderFragment.java:100)
at pom.poly.com.tabatatimer.Fragment.CalenderFragment.update(CalenderFragment.java:183)
at pom.poly.com.tabatatimer.ContentProvider.Eventinf.notifyChanged(Eventinf.java:83)
at pom.poly.com.tabatatimer.ContentProvider.Eventinf.save(Eventinf.java:90)
at pom.poly.com.tabatatimer.Fragment.FinishDialogFragment.onClick(FinishDialogFragment.java:119)
at pom.poly.com.tabatatimer.Fragment.FinishDialogFragment$$ViewBinder$InnerUnbinder$2.doClick(FinishDialogFragment$$ViewBinder.java:46)
at butterknife.internal.DebouncingOnClickListener.onClick(DebouncingOnClickListener.java:22)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
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the getActivity return null
