Добавьте это в свой XML
<com.google.android.gms.ads.AdView xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="@+id/adView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
ads:adSize="SMART_BANNER"
ads:adUnitId="YOUR UNIT ID" />
И вот как вы можете запросить объявления
private AdView mAdView;
MobileAds.initialize(this, "Ads Key This is Different from UNIT ID");
mAdView = findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
mAdView.loadAd(adRequest);
mAdView.setAdListener(new AdListener() {
@Override
public void onAdLoaded() {
Log.e("Add Listener", "AdLoaded");
}
@Override
public void onAdFailedToLoad(int errorCode) {
Log.e("Add Listener", "onAdFailedToLoad" + " - " + errorCode);
}
@Override
public void onAdOpened() {
Log.e("Add Listener", "AdOpened");
}
@Override
public void onAdLeftApplication() {
Log.e("Add Listener", "AdLeft");
}
@Override
public void onAdClosed() {
Log.e("Add Listener", "AdClosed");
}
});