<Alert dialog before a new thread> I have the code...

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Alert dialog before a new thread
I have the code.
After clicking on the button, an alertdialog of the download warning should appear. And request a json file from the server.
btnEnter = findViewById(R.id.btn_enter)
btnEnter.setOnClickListener {
val gson = Gson().toJson(authorization)
val message = gson.toByteArray(StandardCharsets.UTF_8)
val url = URL("my URL")
val responseServer: String?
val progressBar = AlertDialog.Builder(this)
progressBar.setCancelable(false)...