Evento onClickListener del botón Kotlin dentro de un fragmento

Solución:

Regresará antes de que pueda configurar el oyente aquí:

 override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {

        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_setup, container, false)

        val view: View = inflater!!.inflate(R.layout.fragment_setup, container, false)

        btnSetup.setOnClickListener { view ->
            Log.d("btnSetup", "Selected")
        }

        // Return the fragment view/layout
        return view
    }

Intente así:

 override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {


        val view: View = inflater!!.inflate(R.layout.fragment_setup, container, false)

        view.btnSetup.setOnClickListener { view ->
            Log.d("btnSetup", "Selected")
        }

        // Return the fragment view/layout
        return view
    }

Creo que debería usar la función “onViewCreated” en su “SetupFragment”

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

    btnSetup.setOnClickListener { view ->
        Log.d("btnSetup", "Selected")
    }
}

No le estás proporcionando una vista a ese botón

lateinit var mView: View
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    mView=inflater.inflate(R.layout.product_list,container,false)

    mView.addProduct.setOnClickListener {

        val intent=Intent(activity,ProductAddActivity::class.java)
        startActivity(intent)
    }
    return mView
}

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