xarch
· A common architecture for Android applications developing based on MVVM, integrates many open source projects, to make your developing quicker and easier
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 xarch-0.2.6.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.