J2ObjC is an open-source command-line tool from Google that translates Java code to Objective-C for the iOS (iPhone/iPad) platform. This tool enables Java code to be part of an iOS application's build, as no editing of the generated files is necessary. The goal is to write an app's non-UI code (such as data access, or application logic) in Java, which is then shared by web apps (using GWT), Android apps, and iOS apps.
An Android CustomView that morphs base on the quantity of steps provided.
Android Billing Library implements in-app billing's full specification and offers high-level classes to use it. Transactions are stored in a local obfuscated database which can be easily queried.