The Esri ArcGIS Runtime Java Sample Code by Esri provides demonstrations for deploying the ArcGIS Runtime SDK in Java applications. Its Gradle-based Android platform provides instructions for applying command line or Eclipse and IntelliJ IDEA to run samples. The sample code communicates with Esri arcGIS APIs.
With a domain like map.pr, you'd think this would be another link shortener. Instead, it uses the Foursquare API to give you a great way to visualize popular places on FourSquare. And, if you're following the World Cup, you can also use Mappr to find spots frequented by fellow fans.