android - Update fragments in viewpager when a Spinner item is selected -

my goal create simple, multi-language application uses viewpager display fragments. have created :

-"frensh_frag1,frensh_frag2,frensh_frag3 " french fragments

-"english_frag1,english_frag3,english_frag3 " english fragments

what want add spinner displays languages (fr, en), when choose "en" viewpager should display english fragments. how implement spinner code?! code far :

public class mainactivity extends fragmentactivity { private viewpager pager;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);        string[] language={"fr", "en", "sp"};     arrayadapter<string> stringarrayadapter=new arrayadapter<string>     (this,android.r.layout.simple_spinner_dropdown_item,language);     spinner spinner = (spinner)  findviewbyid(r.id.spinner);     spinner.setadapter(stringarrayadapter);      spinner.setonitemselectedlistener(new onitemselectedlistener() {         @override         public void onitemselected(adapterview<?> parentview, view selecteditemview, int position, long id) {             // code here         }          @override         public void onnothingselected(adapterview<?> parentview) {             // code here         }         });        pager = (viewpager) findviewbyid(r.id.viewpager);     pager.setadapter(new mypageradapter(getsupportfragmentmanager()));     pager.setonpagechangelistener(new viewpager.simpleonpagechangelistener() {         @override         public void onpageselected(int position) {             invalidateoptionsmenu();         }     }); }  public boolean oncreateoptionsmenu(menu menu) {     super.oncreateoptionsmenu(menu);     getmenuinflater().inflate(r.menu.activity_screen_slide, menu);      menu.finditem(r.id.action_previous).setenabled(pager.getcurrentitem() > 0);      // add either "next" or "finish" button action bar, depending on page     // selected.     menuitem item = menu.add(menu.none, r.id.action_next, menu.none,             (pager.getcurrentitem() == pager.getadapter().getcount() - 1)                     ? r.string.action_finish                     : r.string.action_next);     item.setshowasaction(menuitem.show_as_action_if_room | menuitem.show_as_action_with_text);     return true; }  public boolean onoptionsitemselected(menuitem item) {     switch (item.getitemid()) {         case android.r.id.home:             // navigate "up" demo structure launchpad activity.             // see http://developer.android.com/design/patterns/navigation.html more.             navutils.navigateupto(this, new intent(this, mainactivity.class));             return true;          case r.id.action_previous:             // go previous step in wizard. if there no previous step,             // setcurrentitem nothing.             pager.setcurrentitem(pager.getcurrentitem() - 1);             return true;          case r.id.action_next:             // advance next step in wizard. if there no next step, setcurrentitem             // nothing.             pager.setcurrentitem(pager.getcurrentitem() + 1);             return true;     }      return super.onoptionsitemselected(item); }  private class mypageradapter extends fragmentpageradapter {      public mypageradapter(fragmentmanager fm) {         super(fm);     }      @override     public fragment getitem(int pos) {         switch(pos) {          case 0: return fr_firstfragment.newinstance("page : 1");         case 1: return fr_secondfragment.newinstance("page : 2");         case 2: return fr_thirdfragment.newinstance("page : 3");         case 3: return fr_fourthfragment.newinstance("page : 4");         default: return null;         }     }      @override     public int getcount() {         return 4;     }       } }