FancyBackground Library
· FancyBackground is an Android library capable of memory-efficiently loading and animating through a set of resource Drawables.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window library-1.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.