Matrix Android Commons Library
· Matrix is an APM (Application Performance Manage) used in Wechat to monitor, locate and analyse performance problems. It is a plugin style, non-invasive solution and is currently available on iOS, macOS and Android.
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 matrix-android-commons-2.1.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.