android - Add fragment and update actionbar title -

i know question refreshing actionbar title has been answered. problem quiet different.

i use fragments add method , not replace method reasons. previous fragment not destroy , when back, previous fragment aren't not recreating.

this configuration :

fragment title "fraga" > fragment b title "fragb"

when go fragment fragment b actionbar title should "fraga" stay "fragb". problem add method fragment not recreating , didn't find event refresh it.

the simple solution found :

1- fragb.onresume : save previous action bar title

2- fragb.ondestroyview : restore previous actionbar title

with solution, result ok, found solution not clean. there better way refresh actionbartitle using add method fragments ?

you can override onbackpressed of activity , each time pressed name of fragment backstack know fragment current at.

sample:

  @override    public void onbackpressed() {     super.onbackpressed();      int framentcount = this.getfragmentmanager().getbackstackentrycount();     if(framentcount != 0)     {         fragmentmanager.backstackentry backentry=getfragmentmanager().getbackstackentryat(framentcount-1);         string str=backentry.getname(); //the tag of fragment         if(str.equals("fraga"))             //set actionbar title fraga         else if(str.equals("fragb"))             //set actionbar title fragb     }       fraga myfraga = (fraga)getfragmentmanager().findfragmentbytag("my_fragmenta_a_tag");      if (myfraga.isvisible()) {            //action bar.title="title first fragment"      }    } 

now know fragment need put tag fragment when add / replace backstack. make sure call addtobackstack put fragments backstack.

fragmenttransaction.add(int containerviewid, fragment fragment, string tag) fragmenttransaction.replace(int containerviewid, fragment fragment, string tag)