You can use layout to show your add. Just put below code in your layout where ever you want into the screen.
<com.google.ads.AdView
android:id="@+id/ad"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
ads:adSize="SMART_BANNER"
ads:adUnitId="Your AddMob ID"
ads:loadAdOnCreate="true"
ads:testDevices="TEST_EMULATOR,TEST_DEVICE_ID_GOES_HERE" />
</RelativeLayout>
You should have the newest GoogleAdmobSdk.jar in you libs folder. This is working for me.