BigImageViewer
· Big image viewer supporting pan and zoom, with very little memory usage and full featured image loading choices. Powered by Subsampling Scale Image View, Fresco, Glide, and Picasso.
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 BigImageViewer-1.8.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.
