Question

即时通讯使用downloadManager但它不会下载任何内容。当我开始下载文件时，它被放在队列列表中，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();       
            }
        });

如果我是debbug，所有价值观似乎都是正确的。这个确切的代码适用于Android 6.0，但是当我尝试使用Android 7.0时它无效。

任何帮助？

非常感谢!!

Answer 1

您是否要求WRITE_EXTERNAL_STORAGE权限？

Answer 2

request = new DownloadManager.Request(Uri.parse(url));
                down_url = 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) getActivity().getSystemService(DOWNLOAD_SERVICE);
                dm.enqueue(request);
                getActivity().registerReceiver(onComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
                Toast.makeText(getActivity(), "Downloading . . .", Toast.LENGTH_LONG).show();

DownloadManager无法启动下载

2 个答案: