How can I login to a website that is not owned by me through an Android App?

I would like to know how I can manage to login into a website (www.garena.com) which is not mine, and neither do I know what kind of response it sends through MY own Android app. I'v开发者_运维知识库e searched for a while but could not find something that matches what I need to do. Is it possible? And if yes, then HOW?

You could find out whether the website has some API's that allow you to login, that should be the best solution. If there isn't any API available you could try to fill the login fields programmatically.