AndroidUIView Library
· It's a very simple custom views library according UIButton in iOS, all of the views can be automatically set a pressed effect to a button with a simple background image without writing a selector.xml
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 androiduiview-1.1.6.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.