title: Ad Size and Ad unit id must be set before loadAd is called
body: <p>I have this in my main xml file:</p>
  
  <pre><code>&lt;com.google.android.gms.ads.AdView
      xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          ads:adUnitId="******************"
          ads:adSize="BANNER"
          android:id="@+id/adView"/&gt;
  </code></pre>
  
  <p>I have already set the ad size and unit id, but when this is run (from MainActivity.java),</p>
  
  <pre><code>AdView adView = (AdView)this.findViewById(com.example.lovetestactual.R.id.adView);
  AdRequest adRequest = new AdRequest.Builder().build();
  adView.loadAd(adRequest);
  </code></pre>
  
  <p>It threw an exception of what is in the title.</p>