Wang Liping--android solution to terminate exit in the program System.exit (0)

system.exit (0);system.exit (0) is to stop everything in your entire virtual machine,
while finish () only exits the activity and does not exit the app, application still exists in memory unless it is reclaimed by the system.   system.exit (0) is the normal exit procedure, system.exit (1) or not 0 indicates an abnormal exit procedure. system.exit (status) exits the program regardless of the status value. There are different points compared to return: Return is back to the previous level, and System.exit (status) is back to the top

Wang Liping--android solution to terminate exit in the program System.exit (0)