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 about Android Wear, a version of the operating system customised for wearable gadgets such as smartwatches and introduced Android Auto, which has been tailored to work with cars.
About 6,000 developers, bloggers and journalists flocked to the event. Following Google's recent revelation that showed that just 30 percent of its employees are women, the company touted that the number of women attending its conference grew to 20 per cent this year from 8 percent a year earlier.
Google's I/O event, a rally of sorts designed to get developers excited about creating apps and devices for Google's ecosystem, comes at a time of transition for the company, which makes most of its money from advertising thanks to its status as the world's leader in online search.
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The company is trying to adjust to an ongoing shift to smartphones and tablet computers from desktop and laptop PCs. Though mobile advertising is growing rapidly, advertising aimed at PC users still generates more money.
Driverless cars, Google Glass, smartwatches and thinking thermostats are just some of its more far-off bets.
On the home front, Google's Nest Labs, which makes network-connected thermostats and smoke detectors, announced earlier this week that it has created a program that allows outside developers, from tiny startups to large companies such as Whirlpool and Mercedes-Benz, to fashion software and "new experiences" for its products.
Integration with Mercedes-Benz, for example, might mean that a car can notify a Nest thermostat when it's getting close to home, so the device can have the home's temperature adjusted to the driver's liking before he or she arrives.
Opening the Nest platform to outside developers will allow Google to move into the emerging market for connected, smart home devices.