dependencies { implementation 'com.google.android.gms:play-services-ads:20.2.0' } MobileAds.initialize(this, new OnInitializationCompleteListener() { @Override public void onInitializationComplete(InitializationStatus initializationStatus) { } }); <com.google.android.gms.ads.AdView xmlns:ads="http://schemas.android.com/apk/res-auto" android:id="@+id/adView" android:layout_width="wrap_content" android:layout_height="wrap_content" ads:adSize="BANNER" ads:adUnitId="YOUR_AD_UNIT_ID" /> AdView adView = findViewById(R.id.adView); AdRequest adRequest = new AdRequest.Builder().build(); adView.loadAd(adRequest); adView.setAdListener(new AdListener() { @Override public void onAdLoaded() { } @Override public void onAdFailedToLoad(LoadAdError adError) { } });