Buttons in loaded layout in a fragment

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Android

Hello,
How can I write code for clicking on a button that it is loaded in a fragment?
The code for fragment:

FragmentManager fm=getSupportFragmentManager();
       android.support.v4.app.FragmentTransaction ft=fm.beginTransaction();
       ft.add(R.id.frame,new Directory());
       ft.commit();

I want to Access clicking on a button in Directory!

What I have tried:

clicking on a button that it is loaded in a fragment