Вы можете создать макет над GameView и поместить GameView и AdView в этот макет.В приведенном ниже примере используется RelativeLayout и помещает надстройку в нижней части экрана.
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
RelativeLayout layout = new RelativeLayout(this);
GameView vw = new GameView( this, intDpi );
layout.addView(vw);
adView = new AdView(this, AdSize.BANNER, "YOUR_AD_UNIT_ID");
// Places adView at bottom of screen.
RelativeLayout.LayoutParams params =
new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, RelativeLayout.TRUE);
layout.addView(adView);
adView.loadAd(new AdRequest());
setContentView(layout);
}