The free version is NOT for commercial work! Go find a job, game making is not providing a stable income, only for some lucky guys that worked long and hard for it.
But, there are free/open source options like this:
P.S. Also, if you want develop serious for Android you need to test your games on many different devices (phones and tablets). If you can not afford a software for 100,- bucks, how you want buy this testing devices?