android - Refreshing data display on a fragment -

i have 2 fragments on view pager. once had move data fragment b , refresh data displayed on , did getitemposition. reason, same method doesn't work when try reset data..

in adapter have :

public void refresh()     {         notifydatasetchanged();     }      @override     public int getitemposition( object obj )      {         return position_none;      } 

in fragment click 'reset' :

@override     public void oncreate(bundle savedinstancestate)      {         super.oncreate(savedinstancestate);         nottriedpasswordslist = pageractivity.mainlist; ..... ....     resetbutton.setonclicklistener( new view.onclicklistener() {                     @override                     public void onclick( view v )                      {                         pageractivity.resetpasswords();                           pageractivity.viewpageradapter.refresh();                     }});   

viewpager activity hosting both fragments:

public static void resetpasswords()     {         mainlist.addall( 0, historylist );         historylist.clear();         pageractivity.viewpageradapter.refresh();     } 

main fragment pass displayed :

@override     public view oncreateview( layoutinflater inflater, viewgroup container, bundle savedinstancestate )      {         view view = inflater.inflate(r.layout.fragment_main, container, false);  .....         nextcodedisplay = ( textview ) view.findviewbyid( r.id.passworddisplaytextview );         nextcodedisplay.settext( nottriedpasswordslist.get( 0 ).getpasswordstring() );  .... nextbutton.setonclicklistener(new view.onclicklistener() {                 public void onclick(view v)                  {                           nottriedpasswordslist.remove( 0 );                          if( nottriedpasswordslist.size() > 0  && !(nottriedpasswordslist.get( 0 ).gettried()) )                         {                             nextcodedisplay.settext( nottriedpasswordslist.get( 0 ).getpasswordstring() );                         }                     }    

pageractivity treated static class, , can access static methods , member data , objects in way. code:

nottriedpasswordslist = pageractivity.mainlist; 

note: pageractivity can access static mainlist object, or nottriedpasswordslist (sharing same memory). object can access since code references static methods.

on code pageractivity.viewpageradapter.refresh(), not clear on data refreshes since don't see enough code, again refresh() must static method. code notifydatasetchanged(), there must direct link between viewpageradapter , data object, arraylist. don't see direct relation between two.

perhaps want code like:

viewpageradapter pageradapter = new viewpageradapter(); 

this way can have relationship between adapter , possibly arraylist object. benefit of creating instance new saves data , state inside class in form of object, in sample pageradapter.

i not suggest specific set of codes since don't see sufficient amount of me fix. perhaps can fix code first , can contribute.