implementation 'com.google.android.gms:play-services-ads:20.1.0' MobileAds.initialize(this, new OnInitializationCompleteListener() { @Override public void onInitializationComplete(InitializationStatus initializationStatus) { } }); AdView adView = new AdView(this); adView.setAdUnitId("YOUR_AD_UNIT_ID"); adView.setAdSize(AdSize.BANNER); AdRequest adRequest = new AdRequest.Builder().build(); adView.loadAd(adRequest); adView.setAdListener(new AdListener() { @Override public void onAdLoaded() { } @Override public void onAdFailedToLoad(LoadAdError loadAdError) { } @Override public void onAdOpened() { } @Override public void onAdClicked() { } });