android - Update NavigationView state when user goes back to previous fragment -

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i'm using navigationview drawer in app. i'm trying go previous fragment if user press button. code works well:

@override public void onbackpressed() {     fragmentmanager fm = getsupportfragmentmanager();             fragment fr = fm.findfragmentbyid(r.id.flcontent);      if (fm.getbackstackentrycount() > 0 ) {         fm.popbackstackimmediate();     }     else {         finish();     }         }

but navigationview doesn't change. how can update navigationview state (check correct fragment, change title, , on), can reflect changes in app?

you should implement navigation using addtobackstack method. take @ this.


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