CI is an eternal topic in software engineering, it is still evolving for mobile. With an introduction to Docker, and a well-crafted Docker image for Android, this talk will guide you through all aspects of using Docker for Android CI — benefits, limitations, pitfalls, tweaks, and performance. It wouldn't be complete without a live demo, showing you how to setup a Jenkins Android slave via Android Docker image with minimal effort in 2 minutes (yes, really). This talk will help you build your own Acme CI at zero cost. Last but not least, there are some other tips about how Docker could help your mobile engineering.