无法从Android下载管理器获取下载文件名

Question

我正在为我的应用程序使用Android下载管理器，它运行正常。但我需要在存储时下载文件名。我没有得到文件名，这是一个错误。我也尝试过所有以前的解决方案。请帮我解决这个问题。

        DownloadManager mgr = (DownloadManager) this.getSystemService(Context.DOWNLOAD_SERVICE);
                boolean isDownloading = false;
                DownloadManager.Query query = new DownloadManager.Query();
                query.setFilterByStatus(
                        DownloadManager.STATUS_PAUSED|
                                DownloadManager.STATUS_PENDING|
                                DownloadManager.STATUS_RUNNING|
                                DownloadManager.STATUS_SUCCESSFUL
                );
                Cursor cur = mgr.query(query);
    String filename="";

                if (cur.moveToFirst()) {
String filePath = cur.getString(cur.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME));
        filename = filePath.substring( filePath.lastIndexOf('/')+1, filePath.length() );
                }



                    Uri source = Uri.parse(myWebsites[j]);


                    DownloadManager.Request request = new DownloadManager.Request(source);

                    request.setNotificationVisibility(
                            DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED
                    );


                    request.setDestinationInExternalPublicDir("/MyDownloadManager/"+folderName,                    filename );

                    request.allowScanningByMediaScanner();


                    long id = mgr.enqueue(request);

                cur.close();

Answer 1

如果您通过downloadId

设置过滤器，这可能会正常工作

query.setFilterById(id);