asasasasas.kt

val request = DownloadManager.Request(Uri.parse(url))
    .setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE)
    .setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "filename.ext")
    .setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI or DownloadManager.Request.NETWORK_MOBILE)

val manager = context.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
val downloadId = manager.enqueue(request)

val query = DownloadManager.Query().setFilterById(downloadId)

var isDownloading = true
while (isDownloading) {
    val cursor = manager.query(query)
    if (cursor.moveToFirst()) {
        val bytesDownloaded = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR))
        val bytesTotal = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES))

        if (cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS)) == DownloadManager.STATUS_SUCCESSFUL) {
            isDownloading = false
        }

        if (bytesTotal > 0) {
            val progress = (bytesDownloaded * 100L / bytesTotal).toInt()
            listener?.onProgress(progress)
        }
    }
    cursor.close()
}