OpenImage
· Your own low-intrusive large image viewer, high imitation WeChat perfect transition animation, supports custom video players, and can also customize the kernel for loading pictures, such as Glide, Picasso or others
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 OpenImageFullLib-2.1.3.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.