Use a simple widget to open/close a ftp server.
FtpWidget is a simple ftp server.
1.Just only a widget for you to transfer files without a USB cable.
2.Touch the logo of the widget will open the app named 'Logo App" that you have chosen in the setting page.(I just want you to open a file explore conveniently)
3.Touch the right part of the widget can start/stop the ftp server.
4.Touch the notification drawer can also stop it.
5.You can use the widget in the lockscreen in android 4.2+.