Today, alongside the launch of Nexus 4 and Nexus 10, Google is officially making the Android 4.2 Jelly Bean SDK available to developers. Included in the release are the lock screen widgets, the Daydream interactive screensaver mode, enhanced support for external displays, and more. Developers can download the Android 4.2 platform from the Android SDK Manager. Google also has an overview of what’s new on its website and an API overview here.
The full release notes from Google (via the Android Developers Blog) are below:
Performance
We’ve worked with our partners to run Renderscript computation directly in the GPU on the Nexus 10, a first for any mobile computation platform.
New ways to engage users
Users can now place interactive lock screen widgets directly on their device lock screens, for instant access to favorite apps and content. With just a small update, you can adapt any app widget to run on the lock screen. Daydream is an interactive screensaver mode that users can encounter when their devices are charging or docked in a desk dock. You can create interactive daydreams that users display in this mode, and they can include any type of content.
New interaction and entertainment experiences
Android 4.2 introduces platform support for external displays that goes beyond mirroring. Your apps can now target unique content to any number of displays attached to an Android device.
Enhancements for international users
To help you create better apps for users in languages such as Arabic, Hebrew, and Persian, Android 4.2 includes native RTL support, including layout mirroring. With native RTL support, you can deliver the same great app experience to all of your users with minimal extra work. Android 4.2 also includes a variety of font and character optimizations for Korean, Japanese, Indic, Thai, Arabic and Hebrew writing systems.
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