How to set previous title of a fragment when backpressed?

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Android

I have created a activity in which I placed a fragment and inside fragment I have used a card view. when I click on card view it moves to next fragment and set title of card view to next fragment toolbar. The problem is when I press back button previous fragment not showing its name and showing next fragment name. Is there any solution for this problem?

What I have tried:

cardLaw.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               replaceFragment(new CategoryDetailFragment());
               ((MainActivity) getActivity()).getSupportActionBar().setTitle("Law & Order");
           }
       });