String attendanceid = s.split("=")[1]

This line of code is extracting the value of the attendance ID from a string "s" that is in the format "key=value".

The "split" method splits the string into an array of two strings, using the "=" character as the separator. The second element of the array (index 1), which contains the value of the attendance ID, is then assigned to the variable "attendanceid".