java - Android submenu: how to go back to previous submenu (or to main menu from submenu) -

beginner trying organize menu... have problem implement "back"-option in submenus. expect lead user automatically main menu. couldn't find solution. did has same challenge before?

i use xml context menu:

<item     android:icon="@android:drawable/ic_menu_sort_by_size"     android:title="menu"     android:id="@+id/main_main_menu"     app:showasaction="always">      <menu>         <item             android:id="@+id/goto_main_menu"             android:orderincategory="1"             android:title="@string/action_goto"             android:icon="@android:drawable/ic_menu_directions">             <menu>                 <item                     android:orderincategory="1"                     android:title="new measurment"                     android:icon="@android:drawable/ic_menu_add"/>                 <item                     android:orderincategory="2"                     android:title="archive"                     android:icon="@android:drawable/ic_menu_agenda"/>                 <item                     android:id="@+id/back_main_menu"                     android:orderincategory="3"                     android:title="back"                     android:icon="@android:drawable/ic_menu_revert"/>             </menu>         </item>          <item             android:orderincategory="4"             android:id="@+id/logout"             android:title="@string/action_logout"             android:icon="@android:drawable/ic_menu_set_as"/>     </menu> </item> 

i use following code display menu:

@override public boolean oncreateoptionsmenu(menu menu) {     getmenuinflater().inflate(r.menu.menu_main, menu);     return true; } 

option click managed following code:

@override public boolean onoptionsitemselected(menuitem item) {     if (id == r.id.back_main_menu) {         toast.maketext(mainactivity.this, "let's go back...", toast.length_long).show();                 return true;         }      if (id == r.id.logout) {         intent intent = new intent(this, mainactivity.class);         startactivity(intent);      }     return super.onoptionsitemselected(item); } 

what should add code return main menu after clicking "back"??

try using onbackpressed() superclass of activity like

@override public boolean onoptionsitemselected(menuitem item) { if (id == r.id.back_main_menu) {          super.onbackpressed();          return true;     }     //  ... return super.onoptionsitemselected(item); } 

if doesn't work, have give me more informations. if use several activities, call finish() method this:

@override public boolean onoptionsitemselected(menuitem item) { if (id == r.id.back_main_menu) {          this.finish()          return true;     }     //  ... return super.onoptionsitemselected(item); }  

finish() close actual viewed activity , navigate last known / viewed activity.

edit1 if have 1 activity, use fragments dynamically inflate views activity. @ example developer page: https://developer.android.com/training/basics/fragments/fragment-ui.html

edit2 if want different menu items appear, use onprepareoptionsmenu(). everytime want new menu, call invalidateoptionsmenu this:

@override public boolean onoptionsitemselected(menuitem item) { if (id == r.id.back_main_menu) {          invalidateoptionsmenu();          return true;     }     //  ... return super.onoptionsitemselected(item); } 

furthermore have define/override onprepareoptionsmenu method in activity:

public void onprepareoptionsmenu(menu menu) {     if(mainmenudisplay)   // if main menu shall displayed     {          // use id's of menu entries enable or disable visibility          menu.finditem(r.id.main_menu_entry1).setvisible(true);          menu.finditem(r.id.other_menu_entry1).setvisible(false);     }      return true; }