Android Download Manager

DownloadManager.kt

class DownloadManager(private val context: Context) {
    fun download(url: String, fileName: String) {
        try {
            val uri = Uri.parse(url)
            val downloadRequest = DownloadManager.Request(uri).apply {
                val extension = MimeTypeMap.getFileExtensionFromUrl(url)
                val name = "$fileName.$extension"
                setTitle(name)
                setAllowedOverMetered(true)
                setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
                setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, name)
            }

            val downloadManager =
                context.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
            val downloadId = downloadManager.enqueue(downloadRequest)

            if (downloadId != 0L) {
                context.shortToast(R.string.lifepack_downloading)
            }

            val br = object: BroadcastReceiver(){
                override fun onReceive(p0: Context?, p1: Intent?) {
                    val id = p1?.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1)
                    if (downloadId == id) {
                        context.shortToast(R.string.lifepack_download_complete)
                    }
                }
            }

            context.registerReceiver(br, IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE))
        } catch(e: Exception) {
            context.shortToast(e.localizedMessage)
        }
    }
}