LinearLayout layout = new LinearLayout(activity);
FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(
FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT);
layoutParams.gravity = Gravity.BOTTOM;
activity.addContentView(layout, layoutParams);
LinearLayout.LayoutParams adParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
adParams.gravity = Gravity.BOTTOM;
layout.addView(adView, adParams);
그라비티를 바텀으로 주면 내려가긴 합니다