android - Fragment is re created when ActionbarSherlock tab is selected -


i have fragment activity holds 3 fragments.

public class mainactivity extends sherlockfragmentactivity { /** called when activity first created. */  @override public void oncreate(bundle savedinstancestate) {      super.oncreate(savedinstancestate);      actionbar bar = getsupportactionbar();     bar.setnavigationmode(actionbar.navigation_mode_tabs);      actionbar.tab tab1 = bar.newtab();     actionbar.tab tab2 = bar.newtab();     actionbar.tab tab3 = bar.newtab();     tab1.settext("");     tab1.seticon(r.drawable.abs__ic_menu_share_holo_dark);     tab2.settext("");     tab2.seticon(r.drawable.abs__ic_voice_search);     tab3.settext("");     tab3.seticon(r.drawable.abs__ic_cab_done_holo_dark);      if (savedinstancestate == null) {          tab1.settablistener(new mytablistener());         tab2.settablistener(new mytablistener());         tab3.settablistener(new mytablistener());         bar.addtab(tab1);         bar.addtab(tab2);         bar.addtab(tab3);      } }  private class mytablistener implements actionbar.tablistener {     @override     public void ontabselected(tab tab, fragmenttransaction ft) {          switch (tab.getposition()) {         case 0:              feedsactivity frag = new feedsactivity();              ft.replace(android.r.id.content, frag);             return;          case 1:             profileactivity frag2 = new profileactivity();             ft.replace(android.r.id.content, frag2);             return;         case 2:             mymemoirsactivity frag3 = new mymemoirsactivity();             ft.replace(android.r.id.content, frag3);             return;          }      }      @override     public void ontabunselected(tab tab, fragmenttransaction ft) {         // todo auto-generated method stub     }      @override     public void ontabreselected(tab tab, fragmenttransaction ft) {         // todo auto-generated method stub     } }

}

and here first fragment,

public class feedsactivity extends sherlockfragment {  public static string[] maincategory;  public static string[] maincategoryid;  @override public view oncreateview(layoutinflater inflater, viewgroup group,         bundle saved) {     setretaininstance(true);     return inflater.inflate(r.layout.activity_feeds, group, false); }    @override public void onactivitycreated(bundle savedinstancestate) {     super.onactivitycreated(savedinstancestate);             new getmaincategory(getactivity()).execute();     } }

when select second tab , select first tab async task in first fragment called again.how can retain state of first fragment view created once? have used setretaininstance(true) didnt work.

i solved issue using show , hide instead of attach , detach.

   private class mytablistener implements actionbar.tablistener {         @override         public void ontabselected(tab tab, fragmenttransaction ft) {              switch (tab.getposition()) {             case 0:                  if (frag1 == null) {                     // if not, instantiate , add activity                     frag1 = fragment.instantiate(getapplicationcontext(),                             feedsactivity.class.getname());                     ft.add(android.r.id.content, frag1, "feeds");                 } else {                     // if exists, attach in order show                     ft.show(frag1);                 }                 return;              case 1:                 if (frag2 == null) {                     // if not, instantiate , add activity                     frag2 = fragment.instantiate(getapplicationcontext(),                             profileactivity.class.getname());                     ft.add(android.r.id.content, frag2, "profile");                 } else {                     // if exists, attach in order show                     ft.show(frag2);                 }                 return;             case 2:                  if (frag3 == null) {                     // if not, instantiate , add activity                     frag3 = fragment.instantiate(getapplicationcontext(),                             history.class.getname());                     ft.add(android.r.id.content, frag3, "history");                 } else {                     // if exists, attach in order show                     ft.show(frag3);                 }                  return;              }          }          @override         public void ontabunselected(tab tab, fragmenttransaction ft) {             // todo auto-generated method stub             if (frag1 != null) {                 // detach fragment, because 1 being attached                 switch (tab.getposition()) {                 case 0:                     ft.hide(frag1);                     return;                 case 1:                     ft.hide(frag2);                     return;                 case 2:                     ft.hide(frag3);                     return;                  }              }         }          @override         public void ontabreselected(tab tab, fragmenttransaction ft) {             // todo auto-generated method stub         }     }

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