quickauth
· Microsoft QuickAuth library for Android provides login-related APIs and a Sign in button that can be embedded into your application to enable users to sign in with their MSA accounts.
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 quickauth-0.4.2.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.