Android, ImageView Does not fill the parent

Below needs to be done so that the ImageView scales appropriately. scaleXY is important 

<imageview android:id="@+id/image_tag&#8221; android:layout_width=" android:layout_height="wrap_content" android:layout_marginleft="20dp" android:layout_marginright="20dp" android:src="@drawable/bg_image&#8221; android:scaleType=" fill_parent="" fitxy=""> </imageview>

references:

http://stackoverflow.com/questions/11510804/imageview-wont-fill-parent