我在日志中得到“背景粘性并发标记扫描G”，然后没有任何反应

I am trying to connect to a FTP server and displaying data on my android app after pulling it from the server, but I have not been able to figure it out. I am facing the above mentioned problem. FTPDownloader class is inside the MainActivity Class and I call it by I am trying to connect to a FTP server and disp