在Webview中下载文件后如何仅使用文件名

Question

我尝试使用“ setdownloadlistener”来使webview可以从Web下载文件及其工作，但是我的问题是我单击了example.pdf文件之类的下载文件，并单击了具有不同名称而非原始名称的文件下载像这样将下载名称更改为“ download.bin”之后，但原始名称为“ example.pdf”，如何“ setdownloadlistener”使用原始名称。我用于下载的代码

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));
                try {
                    request.setMimeType(mimeType);
                    //------------------------COOKIE!!------------------------
                    String cookies = CookieManager.getInstance().getCookie(url);
                    request.addRequestHeader("cookie", cookies);
                    //------------------------COOKIE!!------------------------
                    request.addRequestHeader("User-Agent", userAgent);
                    request.setDescription("Downloading file...");
                    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) getSystemService(DOWNLOAD_SERVICE);
                    dm.enqueue(request);
                    Toast.makeText(getApplicationContext(), "Downloading File", Toast.LENGTH_LONG).show();
                } catch (Exception e) {
                    Toast.makeText(getApplicationContext(), "Error Downloading File.", Toast.LENGTH_LONG).show();
                }
            }
        });

谢谢