按钮上的Admob间隙广告

dependencies {
    implementation 'com.google.android.gms:play-services-ads:20.6.0'
}

import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.InterstitialAd;
import com.google.android.gms.ads.LoadAdError;
import com.google.android.gms.ads.OnPaidEventListener;
import com.google.android.gms.ads.ResponseInfo;
import com.google.android.gms.ads.interstitial.InterstitialAdLoadCallback;

public class MainActivity extends AppCompatActivity {

    private InterstitialAd mInterstitialAd;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 初始化Interstitial广告
        AdRequest adRequest = new AdRequest.Builder().build();
        InterstitialAd.load(this, "ca-app-pub-xxxxxxxxxxxxxxxx/xxxxxxxxxx", adRequest,
            new InterstitialAdLoadCallback() {
                @Override
                public void onAdLoaded(@NonNull InterstitialAd interstitialAd) {
                    mInterstitialAd = interstitialAd;
                }

                @Override
                public void onAdFailedToLoad(@NonNull LoadAdError loadAdError) {
                    mInterstitialAd = null;
                }
            });
    }

    // 显示Interstitial广告
    private void showInterstitialAd() {
        if (mInterstitialAd != null) {
            mInterstitialAd.show(this);
        } else {
            Log.d("MainActivity", "The interstitial ad wasn't loaded yet.");
        }
    }

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

<!-- activity_main.xml -->
<Button
    android:id="@+id/show_ad_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Show Ad" />

// MainActivity.java
Button showAdButton = findViewById(R.id.show_ad_button);
showAdButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        showInterstitialAd();
    }
});