Android Wear 2.0 Developer Preview 4 adds easier sign-in, in-app billing

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If Android Wear is going to make a comeback, it's going to need a pretty serious re-launch with fantastic new software and hardware. At least on the software side, Android Wear 2.0 is shaping up nicely.

Google just released Developer Preview 4 of the Android Wear 2.0 operating system, and it brings with it several welcome features for app makers.

For starters, Google has added a new OAuth API and support for single-click Google sign-in. With Wear 2.0, you can browse the Play Store and install watch apps without putting anything on your phone, so an easy way to sign in to apps and services is necessary. This new feature lets watch apps prompt the phone for an authentication screen. If you're using a Google account, it's even easier—you just get the Google sign-in confirmation screen.

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