secure-preferences
· Android Shared preference wrapper than encrypts the keys and values of Shared Preferences. It's not bullet proof security but rather a quick win for incrementally making your android app more secure.
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 secure-preferences-lib-0.1.7.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.