In 2004, Android was two people who wanted to build camera software but couldn't get investors interested. Today, Android is a large team at Google, delivering an operating system (including camera software) to over 3 billion devices worldwide. This is the inside story, told by the people who made it happen. This is a first-hand chronological account of how the start-up began, how the team came together, and how they all built an operating system from the kernel level to its applications and everything in between.