Fitting a ImageView half the screen height and full the screen width

[nikola1800]

How it is : http://i49.tinypic.com/352lxdt.pngHow I want : http://i45.tinypic.com/bahc1.pnghow to do this via XML and also via code.?I am using RelativeLayout.also want API level 8 (from android 2.3+)..so cant use setWidth(), setHeight()help..?