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Droidcon Berlin Google Developper Group Community App : Write one app together, with 15 minutes each
Website to GDG Berlin Android
What does the droidcon berlin 2018 community build, 15 minutes at a time?
Source of our Workshop given at DevFest Berlin 2017
See past GDG Events through the eyes of a participant.
Global Android Dev Camp Berlin 2014 - https://plus.google.com/events/cb9g72bhpd89nrmksjrn9a5msok