android - Update Activity on closing Fragment -

i have activity a. once has been loaded, on clicking button in adds fragment f on a's home layout. once inside f, if callinggetactivity().getsupportfragmentmanager().popbackstack();, infacts navigates again activity a. there way can make changes in activity once fragment has been popbackstacked? don't know method called in activity once fragment has been popbackstacked , have activity. please help.

you can add onbackstackchangedlistener(). this:

getsupportfragmentmanager().addonbackstackchangedlistener(new onbackstackchangedlistener() {     public void onbackstackchanged()      {                         } }); 

this callback called after each change on stack.