android - Up navigation not appearing, when opening Fragments not in runtime -


the application consists of 1 activity navigationdrawer , can open fragments in 2 level hierarchy also. in latter case, have back button on actionbar implement navigation.
works fine @ runtime, if open fragments in 2 level hierarchy click events, when same code - same code -, navigation button won't show up. navigation still works. if navigate home level, navigationbar's hamburger icon show up, , if open fragments in 2 level hierarchy click events, button show instead of hamburger icon should.
in short: works fine again, if navigate home level.

the related methods: 

private void shoulddisplayhomeasup() {   fragmentmanager fragmentmanager = getsupportfragmentmanager();   boolean shoulddisplay = fragmentmanager.getbackstackentrycount()>0;   actionbar actionbar = getsupportactionbar();   if (actionbar != null) {     actionbar.setdisplayhomeasupenabled(shoulddisplay);     charsequence actionbartitle = actionbar.gettitle();     if (ismainlistfragment(shoulddisplay, actionbartitle)) {       actionbar.settitle(r.string.app_name);       setdrawerenabled(true);     }   } }  private void setdrawerenabled(boolean enabled) {   if (!enabled) {     disabledrawer();     enableactionbarbacknavigation();   } else {     enabledrawer();   } }  private void disabledrawer() {   drawerlayout.setdrawerlockmode(drawerlayout.lock_mode_locked_closed);   actionbardrawertoggle.setdrawerindicatorenabled(false);   actionbardrawertoggle.syncstate(); }  private void enabledrawer() {   drawerlayout.setdrawerlockmode(drawerlayout.lock_mode_unlocked);   actionbardrawertoggle.setdrawerindicatorenabled(true);   actionbardrawertoggle.syncstate(); }  private void enableactionbarbacknavigation() {   actionbardrawertoggle.settoolbarnavigationclicklistener(new view.onclicklistener() {      @override     public void onclick(view view) {       onbackpressed();     }    }); }

the shoulddisplayhomeasup() method called onbackstackchanged(), there no difference, when call in static manner.
call actionbar.setdisplayhomeasupenabled() , actionbardrawertoggle.setdrawerindicatorenabled(false) methods.

see below pictures: left proper one

if set reminder in application, trigger notification. when click on notification, open main screen - home level -, list - can see above -, , detaild view of notification related todo. can navigate in view hierarchy. purpose open fragments programmatically.


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