how to download pdf file from firebase storage and save in external private storage in android
public long downloadFile(Context context, String fileName, String fileExtension, String destinationDirectory, String url) {
DownloadManager downloadmanager = (DownloadManager) context.
getSystemService(Context.DOWNLOAD_SERVICE);
Uri uri = Uri.parse(url);
DownloadManager.Request request = new DownloadManager.Request(uri);
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setDestinationInExternalFilesDir(context, destinationDirectory, fileName + fileExtension);
return downloadmanager.enqueue(request);
}