Admob using Google play services for Banner Ads.

Create a layout in your xml file
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<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >


<LinearLayout
        android:id="@+id/adView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >
    </LinearLayout>



</LinearLayout>

In your Activity Page

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 AdView adView = new AdView(this);
        adView.setAdSize(AdSize.BANNER);
        adView.setAdUnitId(AD_UNIT_ID);

        LinearLayout layout = (LinearLayout) findViewById(R.id.reklam);
       
layout.setVisibility(View.GONE);

        // Request for Ads
        AdRequest adRequest = new AdRequest.Builder()
        .addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
        .build();

    // Start loading the ad in the background.
      adView.loadAd(adRequest);

      adView.setAdListener(new AdListener() {

                @Override
                public void onAdClosed() {
                    // TODO Auto-generated method stub
                    super.onAdClosed();
                }


                @Override
                public void onAdLoaded() {
                    // TODO Auto-generated method stub
                    super.onAdLoaded();
                    layout.addView(adView);
                    layout.setVisibility(View.VISIBLE);

                }


                @Override
                public void onAdOpened() {
                    // TODO Auto-generated method stub
                    super.onAdOpened();
                }

            });