How to get data from website and show it in android app

Question

i am developing an application named Flight Schedule,and what i want to do is to get schedule from a certain website and show it to android Application.For example i select emirates option in my app.Now i want that from official website of emirates i get all schedule according to my requirements and show it to my app.But i don't know how to make this happen.Keeping in mind that schedule change every day.Please help.Thanks