服务器在获得控制权之前接到了下载电话 onDownloadRequested(String url,String userAgent,String contentDisposition,String mimetype,long contentLength)，我的问题是，是否有可能通过Webview调用服务器以获取url + contentdisposition + mimeType等的详细信息？

@Override
    public void onDownloadRequested(String url,long contentLength) {
        /*Intent i = new Intent(Intent.actION_VIEW);
        i.setData(Uri.parse(s));
        startactivity(i);*/
        downloadViaDownloadManager(url,userAgent,contentDisposition,mimetype);
    }

和downloadViaDownloadManager（）具有下载管理器的实现。

我已检查有关服务器呼叫的问题。

这是dowloadViaDownloadManager（）方法。

    private void downloadViaDownloadManager(String url,String mimetype) {
        Uri uri;
        try {
            uri = Uri.parse(url);
            DownloadManager.Request request = new DownloadManager.Request(uri);

            request.setMimeType(mimetype);

            String cookies = CookieManager.getInstance().getcookie(url);
            request.addRequestHeader("cookie",cookies);

            request.addRequestHeader("User-Agent",userAgent);
            request.setDescription("Downloading file...");
            request.setTitle(URLUtil.guessFileName(url,mimetype));
            request.allowScanningByMediaScanner();
            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
            request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,URLUtil.guessFileName(url,mimetype));

            DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
            dm.enqueue(request);

            Toast.makeText(getapplicationContext(),R.string.download_in_progress,Toast.LENGTH_LONG).show();
        } catch (Exception e) {
            e.printStackTrace();
            Toast.makeText(mactivity,R.string.url_not_supported,Toast.LENGTH_SHORT).show();
        }
    }