collector-exoplayer
· Gumlet Exoplayer Collector is the library that listens to the call backs from the Android Exoplayer and passes this data to the Gumlet Collector.
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 collector-exoplayer-1.0.3.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.