fragment - Android FragmentPagerAdapter showing up empty after cache clear -

i make fragmentpageradapter

there fragment has pager.

and pager show 3 fragments , works well.

but, after application cache clearing,

(it means... long time has passed application service backgrounded)

only pager showing , 3 fragments have empty layout (white space).

as result checking log, caught problem lines...

after clearing cache, sectionspageradapter() constructure called then

getitem() method never called.

please me

public class reviewfragment extends sherlockfragment {      private sectionspageradapter msectionspageradapter;      private viewpager mviewpager;      @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         view rootview = inflater.inflate(r.layout.review_fragment, container, false);         return rootview;     }      @override     public void onactivitycreated(bundle savedinstancestate) {         super.onactivitycreated(savedinstancestate);         if (savedinstancestate == null) {              msectionspageradapter = new sectionspageradapter(getactivity().getsupportfragmentmanager());              mviewpager = (viewpager) getactivity().findviewbyid(r.id.pager);             mviewpager.setadapter(msectionspageradapter);         }     }      public class sectionspageradapter extends fragmentpageradapter {          public sectionspageradapter(fragmentmanager fm) {             super(fm);         }          @override         public fragment getitem(int position) {             if (position == 0) {                 return new bfragment();             } else {                 return new cfragment();             }         }          @override         public int getcount() {             return 2;         }          @override         public charsequence getpagetitle(int position) {             switch (position) {             case 0:                 return "1";             case 1:                 return "2";             }             return null;         }     }