title: addTestDevice not working
body: <p>When I try and incorporate test ads into my app it doesn't show the ad and creates an error : ** error: non-static method addTestDevice(String) cannot be referenced from a static context** I'm not sure how to fix this so thanks in advance.</p>
  
  <pre><code>AdView mAdView = (AdView) findViewById(R.id.adView);
          AdRequest adRequest = new AdRequest.Builder().build();
          AdRequest.Builder.addTestDevice("DF738A0CF9E96DB06B085AADFEDCF0CF");
  
  
     android:layout_alignEnd="@+id/main_screen_titletwo"
      android:textColor="#ff000000" /&gt;
  </code></pre>
  
  <p>.</p>
  
  <pre><code>   &lt;com.google.android.gms.ads.AdView
          android:id="@+id/adView"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          ads:adSize="BANNER"
          ads:adUnitId="xxx"
          android:layout_alignParentBottom="true"
          android:layout_centerHorizontal="true"
          android:layout_marginTop="20dp"&gt;
  
      &lt;/com.google.android.gms.ads.AdView&gt;
  
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p><strong>EDIT FIXED</strong></p>
  
  <p>Didn't realise my unitid was there so I put it in.</p>