RootChecker
· RootChecker is a lightweight Android library that provides easy and efficient methods to determine whether the device is rooted, an emulator, using a proxy, or is debuggable. This library is useful for developers who want to improve the security and performance of their applications by preventing them from running on rooted devices, emulators, devices using a proxy, or debuggable devices.
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 RootChecker-0.4.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.