android 4.3 的FTP客户端demo，内含FTP的上传，下载功能，需要在PC上建立FileZilla等FTP服务端，在文件传输上必不可少。希望可以帮助大家，一起进步-android 4.3 FTP client demo, containing FTP upload, download, you need to build FileZilla and other FTP server on the PC, is essential in the file transfer. I hop