Add Banner and Medium Rectangle Ads to an Android App

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
...
>
...
<LinearLayout
android:id="@+id/banner_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
/>
...
</RelativeLayout>

import com.facebook.ads.*;

private AdView adView;

@Override
public void onCreate(Bundle savedInstanceState) {
...
// Instantiate an AdView object.
// NOTE: The placement ID from the Facebook Monetization Manager identifies your App.
// To get test ads, add IMG_16_9_APP_INSTALL# to your placement id. Remove this when your app is ready to serve real ads.

adView = new AdView(this, "IMG_16_9_APP_INSTALL#YOUR_PLACEMENT_ID", AdSize.BANNER_HEIGHT_50);

// Find the Ad Container
LinearLayout adContainer = (LinearLayout) findViewById(R.id.banner_container);

// Add the ad view to your activity layout
adContainer.addView(adView);

// Request an ad
adView.loadAd();
}

@Override
protected void onDestroy() {
if (adView != null) {
adView.destroy();
}
super.onDestroy();
}

import android.widget.Toast;
...

protected void onCreate(Bundle savedInstanceState) {
...
AdListener adListener = new AdListener() {
@Override
public void onError(Ad ad, AdError adError) {
// Ad error callback
Toast.makeText(
MainActivity.this,
"Error: " + adError.getErrorMessage(),
Toast.LENGTH_LONG)
.show();
}

@Override
public void onAdLoaded(Ad ad) {
// Ad loaded callback
}

@Override
public void onAdClicked(Ad ad) {
// Ad clicked callback
}

@Override
public void onLoggingImpression(Ad ad) {
// Ad impression logged callback
// Please refer to Monetization Manager or Reporting API for final impression numbers
}
};

// Request an ad
adView.loadAd(adView.buildLoadAdConfig().withAdListener(adListener).build());
}