Whats the purpose of "this" wen create object in memory? - android : someone can hellp me with this?
i didnt undrerstand two things.
one, is that thing:

    RelativeLayout.LayoutParams center_ob_l = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
            RelativeLayout.LayoutParams.WRAP_CONTENT);

what is the meaning of WARP.CONTENT and why shoukd i do this?

second thing, is the "this":

    Button log_b = new Button(this);

why should i send "this" in those brackets?

and why at all i would want to create by myself the buttons and things instead of just go to the visual device and throw the things i want to the screen?