import android.os.Bundle;   import androidx.appcompat.app.AppCompatActivity;   import com.unity3d.ads.example.R;   import com.unity3d.ads.IUnityAdsInitializationListener;   import com.unity3d.ads.UnityAds;   public class InitializeAdsScript extends AppCompatActivity implements IUnityAdsInitializationListener {     private String unityGameID = "1234567";     private Boolean testMode = true;     @Override     protected void onCreate (Bundle savedInstanceState) {       super.onCreate (savedInstanceState);       setContentView (R.layout.activity_main);       // Initialize the SDK:       UnityAds.initialize(getApplicationContext(), unityGameID, testMode, this);     }     @Override     public void onInitializationComplete() {     }     @Override     public void onInitializationFailed(UnityAds.UnityAdsInitializationError error, String message) {     }   }