set cancel button as category
show alert if you have no bird
add views
refactor file name
Refactor: birdRecordList in Activity
add activity manager
implement select methods
fix save bug
load activity list from db
fix select sql bug and show describe
show activity records in table
change root view controller
fix weakself bug
add new activity button
Refactor: fix file names
dismiss view after save and reload data
add activity view
jump to activity view
show bird name
show activity info