How can create my own ftp extension some guide?

i known that ftp works using tcp/ip for send and receive data but i dont know what activiy starter could me help for make that. thanks for help

i moved your post to right category.

why a ftp extension need activity starter?

because hace native code for http web? or some protocol to transfer files?. or i am wrong?

you can use this jar file:
commons-net-3.6.aia (300.2 KB)
you need to change .aia to .jar