Install the entire Android SDK from the command line without interaction.

android-update-all.bash

# not sure if i wrote this or not. a google search turns up similar results from:
# http://stackoverflow.com/a/30623864/970346
# https://gist.github.com/hardikdangar/67cb7dc1ad7812966a19

time expect -c "

set timeout -1;

spawn android update sdk -u -a

expect {
    \"Do you accept the license\" { exp_send \"y\r\"; exp_continue }
    eof
}"