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class MainActivity : AppCompatActivity() { private var mRewardedAd: RewardedAd? = null private final var TAG = 'MainActivity' override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) var adRequest = AdRequest.Builder().build() RewardedAd.load(this,"ca-app-pub-3940256099942544/5224354917", adRequest, object : RewardedAdLoadCallback() { override fun onAdFailedToLoad(adError: LoadAdError) { Log.d(TAG, adError?.message) mRewardedAd = null } override fun onAdLoaded(rewardedAd: RewardedAd) { Log.d(TAG, "Ad was loaded.") mRewardedAd = rewardedAd } }) } }