Google is kicking off its two-day developer conference in San Francisco.

The company says there are now one billion people using Android devices

As the Internet giant's Android operating system stretches into cars, homes and smartwatches, this year's annual confab will expand on its usual focus on smartphones and tablets. 

Google gave more details Wednesday about Android Wear, a version of the operating system customized for wearable gadgets such as smartwatches and introduced Android Auto, which has been tailored to work with cars.

The company also unveiled an initiative called Android One, designed to help manufacturers build low-cost smartphones for emerging markets such as India.

About 6,000 developers, bloggers and journalists flocked to the event.

-- The Associated Press