Dynamic android app

hello friends,
i want to make an android app which updates the content itself, i have only made static apps until now and i dont have not much idea how to make such types of app.
I want to make an app like news reader like which updates the content like score of a cricket tournament or job alerts or something like that.
i think it has something to do with json(which i dont what it is) or RSS parser…am i right?
pls suggest me how to do that.Do i have to make a website and connect it on my app and only update the website(thus making the app always upto date).is it the right way to do it?
thanks in advance