title: getting started with admob for android - confused about documentation
body: <p>I just started looking into putting Admob ads into the android app I'm building.  So far, no good.  I've been following the example in the AdMod_Android_SDK_Instructions.pdf that I downloaded from the adMob website, but am confused.  On page 7 I see the import statements refer to the package as com.admob.android.ads - but in the SDK I downloaded, the package is com.google.ads - is this a leftover from before google acquired admob?  It then goes on to call the method a<code>dView.requestFreshAd()</code>; - which does not exist in the latest code.
  Please can someone help me out with some code that actually works?  My specific errors from logcat are:</p>
  
  <p>AdView missing required XML attribute adUnitId.</p>
  
  <p>... then after I call <code>adView.loadAd(new AdRequest())</code>; i get:</p>
  
  <pre><code>Invalid unknown request error: Cannot determine request type.  Is your ad unit Id correct?
  onFailedToReceiveAd(Invalid Google Ad request).
  </code></pre>
  
  <p>Any help, much appreciated!
  Thanks.</p>