在android webview中下载javascript生成的文件

WebView webView = new WebView(context);
webView.getSettings().setJavaScriptEnabled(true);

// 生成文件的逻辑
var fileData = "This is the content of the file.";
var fileName = "example.txt";

// 创建一个下载链接
var downloadLink = document.createElement("a");
downloadLink.href = "data:text/plain;charset=utf-8," + encodeURIComponent(fileData);
downloadLink.download = fileName;
downloadLink.style.display = "none";
document.body.appendChild(downloadLink);

// 模拟点击下载链接
downloadLink.click();

// 清理下载链接
document.body.removeChild(downloadLink);

webView.setDownloadListener(new DownloadListener() {
    @Override
    public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
        // 处理下载请求
        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
        request.setMimeType(mimetype);
        request.addRequestHeader("User-Agent", userAgent);
        request.setDescription("Downloading file...");
        request.setTitle(fileName);
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);

        // 获取系统的下载管理器并开始下载
        DownloadManager downloadManager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
        downloadManager.enqueue(request);
    }
});