lifecycle
· A 'compatibility' version of the ActivityLifecycleCallbacks APIs that were introduced in Android 4 (API Level 14) and adding similar mechanism for Fragment.
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 lifecycle-0.1.2.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.