Dynamic relative layout in android

I am trying to have two images on tp of each other. I can have it work fine with an xml file but I would like to do this dynamically. ctdeasyone is a transparent image.

So this works fine..

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <ImageView 
        android:id="@+id/bck1" 
        android:src="@drawable/fish2"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"        
        android:scaleType="fitXY" 
        android:layout_gravity="center">
    </ImageView>

    <ImageView 
        android:id="@+id/bck2" 
        android:src="@drawable/ctdeasyone"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"        
        android:scaleType="fitXY" 
        android:layout_gravity="center">
    </ImageView>

</RelativeLayout>

When I do this. only the second image shows up (it is the transparent one.) Can any of the experts advice on this? Newbbie here... This is my first question. TIA.

public class TwoPicksOnEachOther extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Grabbing the Application context         
        final Context context = getApplication();                   

        RelativeLayout relativeLayout = new RelativeLayout(this);                   

        final ImageView iv = new ImageView(this);         
        iv.setImageResource(R.drawable.fish2);


        RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(     
                RelativeLayout.LayoutParams.FILL_PARENT, 
                RelativeLayout.LayoutParams.FILL_PARENT);
        relativeLayout.addView(iv,lp);        

        // Creating transparent image
        final ImageView iv2 = new ImageView(this);
        iv.setImageResource(R.drawable.ctdeasytwo);
        RelativeLayout.LayoutParams lp2 = new RelativeLayout.LayoutParams(     
                RelativeLayout.LayoutParams.FILL_PARENT, 
                RelativeLayout.LayoutParams.FILL_PARENT);
        relativeLayout.addView(iv2,lp2);
        setContentView(relativeLayout);

    }        

}