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private void downloadFile(String url, String fileName) {
        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
        request.setDescription("Downloading File...");
        request.setTitle(fileName);
        request.allowScanningByMediaScanner();
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
        DownloadManager manager = null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
            manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
        }
        if (manager != null) {
            manager.enqueue(request);
        }
    }