我需要帮助，因为当我在webview上下载一个文件时，我甚至将路径设置为“/storage/17fa-1cea/favorite/”（17fa-1cea是我的sd卡），它总是写在内部存储器上。就像我下载了一个文件后，它写在/storage/emulated/0/storage/17fa-1cea/favorite/file.mp3上，而不是写在sd卡上，它创建了一个新的文件夹。
这是我的密码

mimetype = ".mp3";
            path = "/storage/17FA-1CEA/Favorite/";
             DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));

                        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, contentDisposition, mimetype));
                        request.allowScanningByMediaScanner();
                        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                        request.setDestinationInExternalPublicDir(path, URLUtil.guessFileName(url, contentDisposition, mimetype));
                        DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
                        dm.enqueue(request);
                        Toast.makeText(getApplicationContext(), "Downloading File", Toast.LENGTH_LONG).show();