webview file download code for android studio

webview_downloader.java

webView.setDownloadListener(new DownloadListener() {
    @Override
    public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimeType, long contentLength) {
        DownloadManager.Request request = new
                DownloadManager.Request(Uri.parse(url));

        request.setMimeType(mimeType);
        //------------------------COOKIE!!------------------------
        String cookies = CookieManager.getInstance().getCookie(url);
        request.addRequestHeader("cookie", cookies);
        //------------------------COOKIE!!------------------------
        request.addRequestHeader("User-Agent", userAgent);
        request.setDescription("Downloaded from <ANY NAME>");
        request.setTitle(URLUtil.guessFileName(url, contentDisposition, mimeType));
        request.allowScanningByMediaScanner();

        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, URLUtil.guessFileName(url, contentDisposition, mimeType));
        DownloadManager dm = (DownloadManager) context.getSystemService(DOWNLOAD_SERVICE);

        dm.enqueue(request);

        Toast.makeText(context.getApplicationContext(), "Downloading File", Toast.LENGTH_LONG).show();
    }
});