some guys who still might have the problem like me (FOR IRANIAN and all the coutries who have sanctions) , this is error can be fixed with proxy
i used this free proxy for android studio 3.2
https://github.com/freedomofdevelopers/fod
just to to Settings (Ctrl + Alt + S)
and search HTTP proxy
then check Manual proxy configuration
then add fodev.org
for host name
and 8118
for Port number