Download File with download manager

DownloadManagerActivity

   
    var downloadID: Long = 0L
    var manager: DownloadManager? = null

    private val onDownloadComplete: BroadcastReceiver = object : BroadcastReceiver() {
        override fun onReceive(context: Context, intent: Intent) {
            val id = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1)
            if (downloadID == id) {
                openDownloadedAttachment(context, downloadID)
            }
        }
    }


// TODO PUT THIS IS YOUR onCreate 
registerReceiver(onDownloadComplete, IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE))

   private fun downloadBook(id: String, title: String) {

        val request =
            DownloadManager.Request(Uri.parse(BuildConfig.TIQAN_SERVER_URL + "files/$id"))
                .addRequestHeader("Authorization", "YOUR_AUTH")

        val tempTitle = title.replace(" ", "_")
        request.setTitle(tempTitle)
        // in order for this if to run, you must use the android 3.2 to compile your app
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            request.allowScanningByMediaScanner()
            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
        }

        request.setDestinationInExternalPublicDir(
            Environment.DIRECTORY_DOWNLOADS,
            "$tempTitle.pdf"
        )

        manager = getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
        request.setMimeType("application/pdf")
        request.allowScanningByMediaScanner()
        request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE or DownloadManager.Request.NETWORK_WIFI)
        downloadID = manager!!.enqueue(request)

    }

    private fun openDownloadedAttachment(
        context: Context,
        downloadId: Long
    ) {
        val downloadManager =
            context.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
        val query = DownloadManager.Query()
        query.setFilterById(downloadId)
        val cursor = downloadManager.query(query)
        if (cursor.moveToFirst()) {
            val downloadStatus =
                cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS))
            val downloadLocalUri =
                cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI))
            val downloadMimeType =
                cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_MEDIA_TYPE))
            if (downloadStatus == DownloadManager.STATUS_SUCCESSFUL && downloadLocalUri != null) {
                openDownloadedAttachment(
                    context,
                    Uri.parse(downloadLocalUri),
                    downloadMimeType
                )
            }
        }
        cursor.close()
    }

    private fun openDownloadedAttachment(
        context: Context,
        attachmentUri: Uri,
        attachmentMimeType: String
    ) {
        var attachmentUri: Uri? = attachmentUri
        if (attachmentUri != null) {
            // Get Content Uri.
            if (ContentResolver.SCHEME_FILE == attachmentUri.scheme) {
                // FileUri - Convert it to contentUri.
                val file = File(attachmentUri.path)
                attachmentUri =
                    FileProvider.getUriForFile(this, "YOUR_PACKAGENAME" + .provider", file)
            }
            val openAttachmentIntent = Intent(Intent.ACTION_VIEW)
            openAttachmentIntent.setDataAndType(attachmentUri, attachmentMimeType)
            openAttachmentIntent.flags = Intent.FLAG_GRANT_READ_URI_PERMISSION
            try {
                requestOrderPb.gone()

                context.startActivity(openAttachmentIntent)
            } catch (e: ActivityNotFoundException) {
                Toast.makeText(
                    context,
                    context.getString(R.string.unable_to_open_file),
                    Toast.LENGTH_LONG
                ).show()
            }
        }
    }

    override fun onDestroy() {
        super.onDestroy()
        unregisterReceiver(onDownloadComplete)
    }