android - How to change the menu according to the fragment using navigation drawer -

i'm using navigationdrawer main activity, when go fragment want modify menu, putting arrow home , hide search icon of navbar, i'm having 2 problems here, can hide search icon when change fragment, when i'm navigationmain should visible again, not happening, , if in fragment navigation bar must removed , arrow must appear can home, i've tried far:

public class navigationmain extends actionbaractivity{      private drawerlayout mdrawerlayout;     private listview mdrawerlist;     private android.support.v7.app.actionbardrawertoggle mdrawertoggle;      private charsequence mdrawertitle;     private charsequence mtitle;     private string[] mplanettitles;     static toolbar toolbar;     textview toolbartitle;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          setcontentview(r.layout.navigation_main);           mplanettitles = getresources().getstringarray(r.array.planets_array);         mdrawerlayout = (drawerlayout) findviewbyid(r.id.drawer_layout);         mdrawerlist = (listview) findviewbyid(r.id.left_drawer);         toolbar = (toolbar) findviewbyid(r.id.my_awesome_toolbar);         toolbartitle = (textview) findviewbyid(r.id.titletool);           mdrawerlist.setadapter(new arrayadapter<string>(this,                 r.layout.drawer_list_item, mplanettitles));         mdrawerlist.setonitemclicklistener(new draweritemclicklistener());           mdrawertoggle = new android.support.v7.app.actionbardrawertoggle(                 this,                  /* host activity */                 mdrawerlayout,         /* drawerlayout object */                 toolbar,  /* nav drawer image replace 'up' caret */                 r.string.drawer_open,  /* "open drawer" description accessibility */                 r.string.drawer_close  /* "close drawer" description accessibility */         ) {             public void ondrawerclosed(view view) {                 //getsupportactionbar().settitle(mtitle);                 toolbartitle.settext(mtitle);                 getsupportactionbar().setdisplayshowtitleenabled(false);                 invalidateoptionsmenu(); // creates call onprepareoptionsmenu()             }              public void ondraweropened(view drawerview) {                 //getsupportactionbar().settitle(mdrawertitle);                 toolbartitle.settext(mdrawertitle);                 getsupportactionbar().setdisplayshowtitleenabled(false);                 invalidateoptionsmenu(); // creates call onprepareoptionsmenu()             }         };          setsupportactionbar(toolbar);         mdrawerlayout.setdrawerlistener(mdrawertoggle);         getsupportactionbar().setdisplayshowtitleenabled(false);         getsupportactionbar().setdisplayhomeasupenabled(true);         toolbartitle.settext("nav");         toolbar.inflatemenu(r.menu.main);          mdrawertoggle.syncstate();          if (savedinstancestate == null) {             selectitem(0);         }     }      @override     public boolean oncreateoptionsmenu(menu menu) {          return super.oncreateoptionsmenu(menu);     }      /* called whenever call invalidateoptionsmenu() */     @override     public boolean onprepareoptionsmenu(menu menu) {         // if nav drawer open, hide action items related content view         return super.onprepareoptionsmenu(menu);     }      @override     public boolean onoptionsitemselected(menuitem item) {         // action bar home/up action should open or close drawer.         // actionbardrawertoggle take care of this.         if (mdrawertoggle.onoptionsitemselected(item)) {             return true;         }         // handle action buttons         switch (item.getitemid()) {             case r.id.action_websearch:                 // create intent perform web search planet                 intent intent = new intent(intent.action_web_search);                 intent.putextra(searchmanager.query, toolbartitle.gettext());                 // catch event there's no activity handle intent                 if (intent.resolveactivity(getpackagemanager()) != null) {                     startactivity(intent);                 } else {                     toast.maketext(this, r.string.app_not_available, toast.length_long).show();                 }                 return true;             default:                 return super.onoptionsitemselected(item);         }     }      /* click listner listview in navigation drawer */     private class draweritemclicklistener implements listview.onitemclicklistener {         @override         public void onitemclick(adapterview<?> parent, view view, int position, long id) {             selectitem(position);         }     }      private void selectitem(int position) {          fragmentmanager fragmentmanager = getsupportfragmentmanager();         fragment fragment = new instituicoesfragment();          switch (position) {              case 0:                 fragmentmanager.begintransaction().replace(r.id.content_frame, fragment).commit();                 break;         }         // load conten here         toast.maketext(navigationmain.this, "position" + position, toast.length_long).show();          // update selected item , title, close drawer         mdrawerlist.setitemchecked(position, true);         mdrawerlayout.closedrawer(mdrawerlist);     }      @override     public void settitle(charsequence title) {         mtitle = title;         //getsupportactionbar().settitle(mtitle);         toolbartitle.settext(mtitle);     }       @override     protected void onpostcreate(bundle savedinstancestate) {         super.onpostcreate(savedinstancestate);         // sync toggle state after onrestoreinstancestate has occurred.         mdrawertoggle.syncstate();     }      @override     public void onconfigurationchanged(configuration newconfig) {         super.onconfigurationchanged(newconfig);         // pass configuration change drawer toggls         mdrawertoggle.onconfigurationchanged(newconfig);     }      @override     public void onbackpressed() {          super.onbackpressed();      }   } 

in fragment add following:

 @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         sethasoptionsmenu(true);     }     @override     public void oncreateoptionsmenu(menu menu, menuinflater inflater) {         inflater.inflate(r.menu.main, menu);         menu.removeitem(r.id.action_websearch);         super.oncreateoptionsmenu(menu, inflater);     } 

i used method : inflate menu actionbar items in. in activity oncreateoptionsmenu() check wich fragment displayed , set visibility of items accordingly. in onsectionattached method call invalidateoptionsmenu(); reload oncreateoptionsmenu can have different menu items on each fragment selected

for checking use boolean flags , if flag true means fragment n view, like:

viewing first fragment:

ft.replace(r.id.container, firstfragment); firstfragmentison=true; secondfragmentison=false; 

viewing second fragment:

ft.replace(r.id.container, secondfragment); firstfragmentison=false; secondfragmentison=true; 

and in oncreateoptionsmenu:

menuitem item1=menu.finditem(r.id.item1); menuitem item2=menu.finditem)(r.id.item2); if(firstfragmentison) {   item1.setvisible(true);    item2.setvisible(false); } if(secondfragmentison) {   item1.setvisible(false);    item2.setvisible(true); }