difference between procedural and declarative programming

[fahimeh hashemian]

Hi
I read Hello Android book, i have problem with this line of book_User interfaces can be designed using one of two methods: procedural and declarative_
What is difference between procedural and declarative programming? please with examples.

Thanks
Sincerely

[Ulf Dittmer]

This is explained here: http://developer.android.com/guide/topics/ui/declaring-layout.html