Succese : ListView Item design
Succese : When Select a date, print Log
Success : Get Select Item Information from Database
Success : When Touch a calendar item, show todo list
Refactoring : Delete unused class
		      Item Class structure changes for ToDoList
Design : Calendar item's height setting
Refactoring : Database table normalization
Modify : DB Column Update
Create : Make a function that uses the sql associated with the category