@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_one, container, false);
    }

btnCheckout = (Button) view.findViewById(R.id.btnCheckout);
        btnCheckout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

            }
        });