android - DownloadManager 不开始下载

Question

我正在使用 downloadManager，但它没有下载任何内容。当我开始下载文件时，它被放置在队列列表中并且永远不会开始下载。这是我的代码:

webView.setDownloadListener(new DownloadListener() {
            @Override
            public void onDownloadStart(String url, String userAgent, final String contentDisposition, final 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, contentDisposition, mimeType));
                DownloadManager dm = (DownloadManager) activity.getSystemService(DOWNLOAD_SERVICE);
                dm.enqueue(request);
                Toast.makeText(activity.getApplicationContext(), "Downloading File", Toast.LENGTH_LONG).show();       
            }
        });

如果我调试，所有值似乎都是正确的。此代码适用于 Android 6.0，但当我尝试使用 Android 7.0 时它不起作用。

有什么帮助吗？

非常感谢!!

Answer 1

您是在请求 WRITE_EXTERNAL_STORAGE 权限吗？