onCreateView.kt

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                          savedInstanceState: Bundle?): View? {
    // Inflate the layout for this fragment
    val view: View = inflater.inflate(R.layout.fragment_deudas, container, false)
    fabAgregarDeuda = view.findViewById(R.id.fabAgregarDeuda)
    fabAgregarDeuda.setOnClickListener {
        // Aquí código del click :)
    }
    return view
}