The Esri ArcGIS Runtime Android Java Sample Code by Esri provides demonstrations for deploying the ArcGIS Runtime SDK in Android applications. Its deployment requires Android studio and the onward of JDK 7. The sample code communicates with Esri arcGIS APIs. Its Gradle-based Android platform allows developers to clone directly and import applications in Android studio.
Factual recently announced a new SDK that enables third party apps and services to pull location data from its massive database and trigger certain actions in response to data points like location, environment, movement and more. The SDK is easily used through the Garage Web UI.
After much anticipation since its private beta release in March, Yahoo! has made Fire Eagle publicly available. Fire Eagle is an open geo-location platform that allows users to broadcast their geographic location to the Web while at the same time giving the the ability to easily control how and on which sites location data is shared (our Fire Eagle API profile).