title: Ad not showing on Fragment
body: <p>I'm targetting my app for phones and tablets. I've created a <code>fragments.xml</code> on <code>/layout</code> and on <code>/layout-land</code>.</p>
  
  <p>On the class that manages the fragments I've put this:</p>
  
  <pre><code>protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.fragments);
  
      adView = (AdView) this.findViewById(R.id.adView);
      AdRequest adRequest = new AdRequest.Builder().build();
      adView.loadAd(adRequest);
  
      if (findViewById(R.id.fragmentsboth) != null) {
          numberOfPanes = 1;
          if (savedInstanceState != null) {
              return;
          }
          QueryFragment firstFragment = new QueryFragment();
          getSupportFragmentManager().beginTransaction().add(R.id.fragmentsboth, firstFragment).commit();
      } else if (savedInstanceState == null) {
          QueryFragment firstFragment = new QueryFragment();
          getSupportFragmentManager().beginTransaction().add(R.id.fragment_one, firstFragment).commit();
          if (operation != 5) {
              Infodata secondFragment = new Infodata();
              getSupportFragmentManager().beginTransaction().add(R.id.fragment_two, secondFragment).commit();
          } else {
              Compare secondFragment = new Compare();
              getSupportFragmentManager().beginTransaction().add(R.id.fragment_two, secondFragment).commit();
          }
      }
      }
  </code></pre>
  
  <p>I've added the <code>AdView</code> to both of my <code>fragments.xml</code> and it is working as expected on the phone. The ad is show.</p>
  
  <p>On the tablet, I can see the space for the ad but no add is show. </p>
  
  <p>Here is the code from <code>fragments.xml</code> for the tablets:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:id="@+id/drawer_layout"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:background="@color/lightgrey"&gt;
      &lt;LinearLayout
              android:id="@+id/fragment_container"
              android:orientation="horizontal"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:background="@color/lightgrey"
              android:baselineAligned="false"&gt;
          &lt;LinearLayout
                  android:id="@+id/fragment_one"
                  android:orientation="horizontal"
                  android:layout_width="0dp"
                  android:layout_weight="1"
                  android:layout_height="fill_parent"
                  android:background="@color/lightgrey"&gt;
          &lt;/LinearLayout&gt;
          &lt;LinearLayout
                  android:id="@+id/LinearLayout01"
                  android:layout_width="0dp"
                  android:layout_weight="2"
                  android:layout_height="fill_parent"
                  xmlns:android="http://schemas.android.com/apk/res/android"
                  android:orientation="vertical"
                  android:baselineAligned="false"&gt;
              &lt;LinearLayout
                      android:id="@+id/fragment_two"
                      android:orientation="horizontal"
                      android:layout_width="match_parent"
                      android:layout_height="0dp"
                      android:background="@color/lightgrey"
                      android:layout_weight="1"&gt;
  
              &lt;/LinearLayout&gt;
              &lt;LinearLayout
                      android:layout_width="fill_parent"
                      android:layout_height="wrap_content"
                      android:orientation="horizontal"&gt;
                  &lt;com.google.android.gms.ads.AdView
                          android:id="@+id/adView"
                          xmlns:ads="http://schemas.android.com/apk/res-auto"
                          android:layout_width="fill_parent"
                          android:layout_height="wrap_content"
                          ads:adUnitId="12121212"
                          ads:adSize="SMART_BANNER"
                          android:layout_gravity="center|bottom"
                          android:layout_alignParentStart="true"/&gt;
              &lt;/LinearLayout&gt;
          &lt;/LinearLayout&gt;
      &lt;/LinearLayout&gt;
      &lt;ListView
              android:id="@+id/list_slidermenu"
              android:layout_width="240dp"
              android:layout_height="match_parent"
              android:layout_gravity="start"
              android:choiceMode="singleChoice"
              android:divider="@color/orange"
              android:dividerHeight="1dp"
              android:listSelector="@drawable/menulist_selector"
              android:background="@color/lblack"/&gt;
  &lt;/android.support.v4.widget.DrawerLayout&gt;
  </code></pre>
  
  <p><strong>Why isn't the ad shown?</strong></p>