adding admob ad to drawerlayout

I am trying to place an admob ad at the bottom of my main screen which is set as drawer layout. The first time I ran the project on my device the ad appeared right in the middle, but I wanted it to appear at the bottom so I moved the admob code to the bottom of the activity_main.xml and now its just not appearing at all no matter where I place this code and I also get no errors in log-cat, this leads me to believe its a layout issue??

Heres my xml code..

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
    xmlns:android="http://ift.tt/nIICcg"
    xmlns:ads="http://ift.tt/GEGVYd" 
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- Framelayout to display Fragments -->
    <FrameLayout
        android:id="@+id/frame_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <!-- Listview to display slider menu -->
    <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/list_divider"
        android:dividerHeight="1dp"        
        android:listSelector="@drawable/list_selector"
        android:background="@color/list_background"/>

        <com.google.android.gms.ads.AdView xmlns:ads="http://ift.tt/GEGVYd"
        android:id="@+id/adView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        ads:adUnitId="*********************"
        ads:adSize="SMART_BANNER"/>

</android.support.v4.widget.DrawerLayout>

Heres where i add my AdMob code in MainActivity.java

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        AdMobPoker.track(findViewById(R.id.adView), savedInstanceState);

Thanks in advance for any help on this.