<LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/linearLayout"
            android:background="@android:color/white"
            android:orientation="vertical"
            android:padding="2dp"
            android:paddingTop="10dp">

            <com.google.android.gms.ads.AdView
                android:id="@+id/adView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                ads:adSize="BANNER"
                ads:adUnitId="ca-app-pub-5388685404350149/2739466119" />
        </LinearLayout>

AdView ad = (AdView) findViewById(R.id.adView);
    AdRequest adRequest = new AdRequest.Builder()
            .addTestDevice(AdRequest.DEVICE_ID_EMULATOR).build();
    ad.loadAd(adRequest);