Google is launching a new cross-device software development kit (SDK) that lets developers create apps that connect across a range of Android devices. The toolkit uses Wi-Fi, Bluetooth, and ultra-wideband to deliver multi-device connectivity. Google eventually wants to extend support to non-Android phones, tablets, TVs, cars, and other Android surfaces, including iOS and Windows, but there’s no word on when this will happen. Google describes various use cases for the toolkit on its documentation page, and it looks like it could come in handy in many scenarios. For example, it could let users on separate devices choose items from a menu when creating a group food order, saving you from passing your phone around the room. . . .