If you're developing Android apps these days, you're going to want to understand Material Design, which is the cornerstone of the latest version - 5.0 Lollipop. The subject was discussed at Devoxx 2014, and Google is now sharing that on YouTube.
The video description is as follows:
Nick (@crafty, google.com/+NickButcher) and Chet (@chethaase, google.com/+ChetHaase) discuss the importance of design for developers and Google Material Design implementations in Android 5.0 Lollipop and in the Polymer Web Components project.
Google has more Devoxx interviews available here.
Image via YouTube