title: How to know if AdMob ad has been loaded
body: <p>My Andorid app works offline and online. It displays ads when it is in online mode. 
  In a scenario where it is working in offline mode and user switches the internet connectivity on, I want to know if the ad is already loaded. If not, then I would load a new ad. I looked at AdMob API (AdView class) but could not find something that does this. </p>
  
  <p>Here is the implementation of my <code>AdListener</code> according to the answer from @Hounshell. But none of the methods implemented here are getting executed.</p>
  
  <pre><code>        adView.setAdListener(new AdListener() {
  
          @Override
          public void onReceiveAd(Ad arg0) {
              Toast.makeText(act, "Ad received",Toast.LENGTH_LONG).show();
          }
  
          @Override
          public void onPresentScreen(Ad arg0) {
          }
  
          @Override
          public void onLeaveApplication(Ad arg0) {
              // TODO Auto-generated method stub
  
          }
  
          @Override
          public void onFailedToReceiveAd(Ad arg0, ErrorCode arg1) {
              Toast.makeText(act, "Failed to receive Ad",Toast.LENGTH_LONG).show();
          }
  
          @Override
          public void onDismissScreen(Ad arg0) {
              // TODO Auto-generated method stub
  
          }
      });
  </code></pre>
  
  <p>And part of main.xml that covers the AdView</p>
  
  <pre><code>&lt;FrameLayout 
                      android:layout_width="fill_parent"
                      android:layout_height="50dp"
                      &gt;
                  &lt;com.google.ads.AdView
                      xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
                      android:id="@+id/adView"
                      android:layout_width="fill_parent"
                      android:layout_height="fill_parent"
                      ads:adSize="BANNER"
                      ads:adUnitId="xxxxxxxxxxxxxxxx"
                      ads:loadAdOnCreate="true" /&gt;
                  &lt;/FrameLayout&gt;
  </code></pre>