XML : Link xml lay-out with java class

  package com.example.bjorn.guidbru;    import android.os.Bundle;  import android.view.LayoutInflater;  import android.view.View;  import android.view.ViewGroup;    public class Extra_Info {        public View onCreateView(LayoutInflater inflater, ViewGroup container,                               Bundle savedInstanceState) {          View rootView = inflater.inflate(R.layout.extra_info, container, false);          return rootView;      }  }    

I am new with android studio and I have to creat a simple app. I made a class Extra_Info and also the xml lay-out file extra_info. Now I want to show the content of the file in the xml in my app using this code. But it doesn't works. What do I have to Add?

I am using navigationdrawer activity.