android MoPub ad align
<p>hello how to show mopub ad at the bottom?</p>

<p>I have this code</p>

<pre><code>RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT);
        params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
        mopView = new MoPubView(this);
            mopView.setAdUnitId(PUB_ID_320x50);
            mopView.setLayoutParams(params);
            mopView.loadAd();
            mainRelative.addView(mopView, params);
</code></pre>

<p>but it show in center of screen , how to align to bottom? 
p.s. my main layout is RelativeLayout</p>
