GetUsersAsyncTask.kt

class GetUsersAsyncTask : AsyncTask<Void, Void, ArrayList<User>?>() {

    override fun doInBackground(vararg params: Void?): ArrayList<User>? {

        var urlConnection: HttpURLConnection? = null
        var reader: BufferedReader? = null
        val userList = ArrayList<User>()

        try {

            val url = URL("http://5cb8aeae1551570014da41eb.mockapi.io/api/users")
            urlConnection = url.openConnection() as HttpURLConnection?
            urlConnection?.requestMethod = "GET"
            urlConnection?.connect()

            val inputStream = urlConnection?.inputStream ?: return null
            reader = BufferedReader(InputStreamReader(inputStream))

            val response = reader.readLine()
            response?.let {

                val jsonArray = JSONArray(it)
                if (jsonArray.length() != 0) {
                    for (index in 0 until jsonArray.length()) {

                        val jsonObject = jsonArray.getJSONObject(index)
                        jsonObject?.let {
                            val createdAt = jsonObject.getString("createdAt")
                            val isPro = jsonObject.getBoolean("is_pro")
                            val name = jsonObject.getString("name")
                            val id = jsonObject.getString("id")
                            val avatar = jsonObject.getString("avatar")
                            val job = jsonObject.getString("job")
                            val username = jsonObject.getString("username")

                            val user = User(createdAt, isPro, name, id, avatar, job, username)
                            userList.add(user)
                        }
                    }
                } 
            }
        } catch (e: Exception) {
            e.printStackTrace()
        }finally {
            urlConnection?.disconnect()
            reader?.close()
        }
        
        return userList
    }
}