Sony Mobile unveiled its Add-on SDK, which brings together a number of APIs for Xperia smartphones, tablets and related Sony products.

The SDK is an extension for the standard Android SDK and includes Smart Extension APIs, which allow developers to build apps which support the Android-compatible SmartWatch and Smart Wireless Headset pro.

The Small Apps API provides the same the ability to build apps that run on top of other apps for various Xperia devices, while the IR remote API enables developer to build apps that exploit IR remote sensors found on some devices.

Apps can also be developed for the Infinite button on the WALKMAN music player on most Xperia devices using the Media Infinite API. The Infinite button lists apps offering music-related information and services such as YouTube or Wikipedia.

Sony plans to add more APIs to the Add-on SDK.