Please add the shashlik android emulator to the portage tree. See http://www.shashlik.io/ and https://github.com/shashlik for details.
In case someone is interested, I have an ebuild for it in my anyc-overlay: https://github.com/anyc/anyc-overlay/tree/master/app-emulation/shashlik-bin I will update it to the latest version soon but there's a good chance it simply works by increasing the version number.