如何在android webview中下载数据表导出的excel文件？

如何解决如何在android webview中下载数据表导出的excel文件？

我在我的 android 应用程序中编写了以下代码来从 webview 下载文件。

webView.setDownloadListener(new DownloadListener() {
        @RequiresApi(api = Build.VERSION_CODES.M)
        @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("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,mimeType));
            DownloadManager dm = (DownloadManager) getContext().getSystemService(DOWNLOAD_SERVICE);
            dm.enqueue(request);
            Toast.makeText(getContext(),"Downloading File",Toast.LENGTH_LONG).show();
        }
    });

但是当我点击导出按钮时，这个监听器会被调用。但在我得到的网址中数据：应用程序/ vnd.ms-Excel;具有的base64，PGh0bWwgeG1sbnM6bz0idXJuOnNjaGVtYXMtbWljcm9zb2Z0LWNvbTpvZmZpY2U6b2ZmaWNlIiB4bWxuczp4PSJ1cm46c2NoZW1hcy1taWNyb3NvZnQtY29tOm9mZmljZTpleGNlbCIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnL1RSL1JFQy1odG1sNDAiPjxtZXRhIGh0dHAtZXF1aXY9ImNvbnRlbnQtdhlwZSIgY29udGVudD0iYXBwbGljYXRpb24vdm5kLm1zLWV4Y2VsOyBjaGFyc2V0PVVURi04Ij48aGVhZD48IS0tW2lmIGd0ZSBtc28gOV0 + PHhtbD48eDpFeGNlbFdvcmtib29rPjx4OkV4Y2VsV29ya3NoZWV0cz48eDpFeGNlbFdvcmtzaGVldD48eDpOYW1lPldvcmtzaGVldDwveDpOYW1lPjx4OldvcmtzaGVldE9wdGlvbnM + PHg6RGlzcGxheUdyaWRsaW5lcy8 + PC94OldvcmtzaGVldE9wdGlvbnM + PC94OkV4Y2VsV29ya3NoZWV0PjwveDpFeGNlbFdvcmtzaGVldHM + PC94OkV4Y2VsV29ya2Jvb2s + PC94bWw + PCFbZW5kaWZdLS0 + PHN0eWxlPmJyIHttc28tZGF0YS1wbGFjZW1lbnQ6c2FtZS1jZWxsO308L3N0eWxlPjwvaGVhZD48Ym9keT48dGFibGU + PHRoZWFkPjx0cj48dGg + QWN0aW9uczwvdGg + PHRoPkxlYWQgSUQ8L3RoPjx0aD5DcmVhdGVkIE9uPC90aD48dGg + rmlyc3QgbmFtZTwvdGg + PHRoPkxhc3QgTmFtZTwvdGg + PHRoPk1vYmlsZTwvdGg + PHRoPkVtYWlsPC90aD48dGg + 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应用崩溃，提示 java.lang.IllegalArgumentException: Can only download HTTP/HTTPS URIs