android - Current menu item view is always null in navigation view -


i'm using navigation view. , reason can't view of menu item. it's null. tried viewobserver, findviewbyid, didn't work. need y coord of current menu item location while performing item selection event. possible?

initializing drawer

 activity.drawerindicator.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view v) {                 if (activity.drawerlayout.isdrawervisible(gravitycompat.start)) {                     activity.drawerlayout.closedrawer(gravitycompat.start);                 } else {                     activity.drawerlayout.opendrawer(gravitycompat.start);                 }             }         });         activity.drawerlayout.setdrawerlistener(new drawerlayout.drawerlistener() {             @override             public void ondrawerslide(view view, float v) {              }              @override             public void ondraweropened(view view) {                 activity.closekeyboard();             }              @override             public void ondrawerclosed(view view) {                 // refresh code can called here                 //activity.closekeyboard();             }              @override             public void ondrawerstatechanged(int i) {              }         });

initializing navigation view

public void initnavigationview() {         activity.navigationview.setnavigationitemselectedlistener(new navigationview.onnavigationitemselectedlistener() {              // method trigger on item click of navigation menu              @override              public boolean onnavigationitemselected(menuitem menuitem) {                  //closing drawer on item click                  final int itemid=menuitem.getitemid();                   final viewtreeobserver viewtreeobserver =activity.navigationview.getviewtreeobserver();                   viewtreeobserver.addongloballayoutlistener(new viewtreeobserver.ongloballayoutlistener() {                      @override                      public void ongloballayout() {                          view menubutton = activity.findviewbyid(itemid);                          // called when button not there yet, must test null                          if (menubutton != null) {                              // found it! need button                               int[] location = new int[2];                              menubutton.getlocationinwindow(location);                               sharedpreferencescontroller.getinstance(activity.getapplicationcontext()).settopposition(location[1]);                               // can rid of listener                              viewtreeobserver.removeglobalonlayoutlistener(this);                          }                      }                  });                   activity.drawerlayout.closedrawers();                      switch (menuitem.getitemid()) {                       case r.id.checkin:                          if (!menuitem.ischecked())                              menuitem.setchecked(true);                          return gotocheckinitemmenu();                      case r.id.boarding_passes:                          return gotoboardingpassesitemmenu(menuitem);                      case r.id.flight_status:                          return gotoflightstatusitemmenu(menuitem);                      case r.id.timetable:                          return gototimetableitemmenu(menuitem);                      case r.id.promotion:                          return gotopromotionitemmenu(menuitem);                      //case r.id.reccomend_app:                      //    return gotoreccomendappitemmenu();                      case r.id.about_app:                          return gotoaboutappitemmenu(menuitem);                      case r.id.contact_us:                          return gotocontactusitemmenu(menuitem);                      case r.id.settings:                          return gotosettingsitemmenu(menuitem);                      case r.id.data_protection:                          return gotodataprotectionitemmenu(menuitem);                      case r.id.checkin_info:                          return gotocheckininfoitemmenu(menuitem);                      case r.id.panorama:                          return gotopanoramaclubitemmenu();                      default:                          toast.maketext(activity.getapplicationcontext(), "somethings wrong", toast.length_short).show();                          return true;                  }              }          }         );     }

as see im trying current location of menuitem on screen using treeobserver. know observer works after happens, meaning not working right after called. anyway menubutton view null


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