Hugo Barra was the face of Android for the last several years. If Google needed someone out front for a demo, it was going to be Barra. He was personable and effective on stage, but he announced a few weeks ago that he was leaving Mountain View for Chinese smartphone maker Xiaomi where he will serve as VP of global. It seemed abrupt, but Barra has revealed in an interview with All Things D that the move was in the works for some time.