android - Struggling with a top level FragmentPagerAdapter containing a Fragment with its own FragmentPagerAdapter -

have 2 level ui, top level has tab strip powered fragmentpageradapter. 1 of fragments in turn has 2nd level fragmentpageradapter , own tab strip carrying couple of "sub"fragments. now, sub fragments display when first time top level tabs traversed. "sub"fragments not display upon 2nd iteration

here how subtabpager adapter created in 1 of fragments exist @ top level

public final class mainleveltabfragment extends fragment {

private subpagetabspageradapter msubpagepageradapter; private viewpager msubpageviewpager; private slidingtablayout mslidingtablayout;   @override public view oncreateview(layoutinflater inflater,                          viewgroup container, bundle savedinstancestate) {      view rootview = null;     bundle bundle = getarguments();          rootview = inflater.inflate(r.layout.fragment_tab_main_level, container, false);         msubpageviewpager = (viewpager) rootview.findviewbyid(r.id.subpage_screen_tabs_pager);         mslidingtablayout = (slidingtablayout) rootview.findviewbyid(r.id.sliding_tabs);          msubpagepageradapter = new subpagetabspageradapter(getsupportfragmentmanager, getactivity());         msubpageviewpager.setadapter(msubpagepageradapter);      return rootview; } 

the subpagetabspageradapter code looks this

public class subpagetabspageradapter extends fragmentpageradapter {      private context mcontext;     private cursor mcursor;      public subpagetabspageradapter(fragmentmanager fm, context context) {         super(fm);         mcontext = context;     }      @override     public fragment getitem(int position) {         if (null == mcursor)             return null;          mcursor.movetoposition(position);          fragment fragment = new subtabfragment();         fragment.setarguments(args);          return fragment;     }      @override     public int getcount() {         return (null != mcursor) ? mcursor.getcount() : 0;     }      @override     public charsequence getpagetitle(int position) {         if (null == mcursor)             return null;          mcursor.movetoposition(position);          return "title";     }      public void swapcursor(cursor c) {         if (mcursor == c)             return;          mcursor = c;         notifydatasetchanged();     } } 

i think might have use getchildfragmentmanager() instead of getsupportfragmentmanager() in subpagetabspageradapter constructor.