android - Understanding fragment stack -


i have action bar (actionbarsherlock) tab navigation , have couple of action items well. 1 of action items displays listfragment , here how call it:

    case r.id.menuitem_info:         // create new fragment , transaction         sherlocklistfragment aboutlistfragment = new aboutlistfragment();         fragmenttransaction ft = getsupportfragmentmanager().begintransaction();          // replace whatever in fragment_container view fragment,         // , add transaction stack         ft.replace(r.id.root, aboutlistfragment);         ft.addtobackstack(null);         actionbar actionbar = getsupportactionbar();         actionbar.setdisplayhomeasupenabled(true);          // commit transaction         ft.commit();         return true;

my problem when hit button, illegalargumentexception. i'm not sure how remove fragment view , display previous view?

here home button code:

    case android.r.id.home:         fragmentmanager fm = getsupportfragmentmanager();         if (fm.getbackstackentrycount() > 0) {             fm.popbackstack();         }         return true;

any suggestions appreciated!

i did following in case android.r.id.home:

      case android.r.id.home:         fragmentmanager fm = getsupportfragmentmanager();         if(fm.getbackstackentrycount()>0){             onbackpressed();         }         return true;

i hope you, me works charm


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