Android Recreational Tinkering (ART) is a weekly meetup for Android developers. It's a healthy mix of experienced developers and beginners. We come together to exchange knowledge, discuss new techniques and OS features, or simply work on our own apps and projects. (So bring your own laptop, smartphone, ...)
If you already know what you want to work on, we encourage you to join our Android Developer Group Berlin Slacks #tinkering channel. There all attendees and organizers are encouraged to hang out.