title: Add a Admob banner bottom the page without overlapping content
body: <p>I want to install a banner at the bottom of the page, but it overlaps the content in main screen.
  In the main screen there is a lot of content and there scrolling.</p>
  
  <p>Does anyone know why? 
  Thanks.</p>
  
  <p>XML</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:androidsam="http://schemas.android.com/apk/res/com.jameselsey"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical" &gt;
  
      &lt;LinearLayout
          android:id="@+id/home_layout"
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:orientation="vertical" &gt;
  
          &lt;LinearLayout            &lt;!-- CONTENT LAYOUT HERE --&gt;
  
              android:id="@+id/flContainer"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:orientation="vertical" &gt;
          &lt;/LinearLayout&gt;
          &lt;!-- Put all your application views here, such as buttons, textviews, edittexts and so on --&gt;
  
      &lt;/LinearLayout&gt;
  
      &lt;LinearLayout
          android:id="@+id/ad_layout" &lt;!-- AdMob LAYOUT --&gt;
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:layout_alignBottom="@+id/home_layout"
          android:layout_alignParentBottom="true"
          android:gravity="bottom"
          android:orientation="vertical" &gt;
      &lt;/LinearLayout&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>MainActivity.java</p>
  
  <pre><code>// Create an ad.
  adView = new AdView(context);
  adView.setAdSize(AdSize.BANNER);
  adView.setAdUnitId(AD_UNIT_ID);
  
  // Add the AdView to the view hierarchy. The view
  // will have no size
  // until the ad is loaded.
  LinearLayout layout = (LinearLayout) findViewById(R.id.ad_layout);
  layout.getBottom();
  layout.addView(adView);
  
  // Create an ad request. Check logcat output for the
  // hashed device ID to
  // get test ads on a physical device.
  AdRequest adRequest = new AdRequest.Builder()
          .addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
          .addTestDevice("INSERT_YOUR_HASHED_DEVICE_ID_HERE").build();
  
  // Start loading the ad in the background.
  adView.loadAd(adRequest);
  </code></pre>