如何获取文件名将其放入webview DownloadListener中的下载器文件

webView.setDownloadListener(new DownloadListener() {
    @Override
    public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
        // 在这里处理下载事件
    }
});

String filename = "";
String[] parts = contentDisposition.split(";");
for (String part : parts) {
    if (part.trim().startsWith("filename")) {
        String[] name = part.split("=");
        filename = name[1].trim().replaceAll("\"", "");
        break;
    }
}

DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, filename);
DownloadManager downloadManager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
long downloadId = downloadManager.enqueue(request);