android - Navigation view handle back button on fragment -

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hi need handle button on fragment. using navigation on mobile apps. question how handle button when open new fragment page?

i try using below code on new fragment.

  actionbar.setdisplayshowhomeenabled(true);   actionbar.setdisplayhomeasupenabled(true);

but when click button , navigation open. solution ?

thanks

as know whenever user presses back button need go loaded fragment , try (note fragment must added transaction.addtobackstack(null);) 

@override public boolean onoptionsitemselected(menuitem item) {      if (item.getitemid() == android.r.id.home) {         int backstackcount = fragmentmanager.getbackstackentrycount();//check how many frags loaded         if (backstackcount > 0) {             fragmentmanager.popbackstack(); //go loaded fragment         }        }      return super.onoptionsitemselected(item); }

happycoding;


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