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public class RewardedAdActivity extends AppCompatActivity {
    @Nullable
    private RewardedAd mRewardedAd = null;
    @Nullable
    private RewardedAdLoader mRewardedAdLoader = null;
    private ActivityRewardedAdBinding mBinding;

    public RewardedAdActivity() {
        super(R.layout.activity_rewarded_ad);
    }

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mBinding = ActivityRewardedAdBinding.inflate(getLayoutInflater());
        setContentView(mBinding.getRoot());

        // Interstitial ads loading should occur after initialization of the SDK.
        // Initialize SDK as early as possible, for example in Application.onCreate or Activity.onCreate
        mRewardedAdLoader = new RewardedAdLoader(this);
        mRewardedAdLoader.setAdLoadListener(new RewardedAdLoadListener() {
            @Override
            public void onAdLoaded(@NonNull final RewardedAd rewardedAd) {
                mRewardedAd = rewardedAd;
                // The ad was loaded successfully. You can now show the ad.
            }

            @Override
            public void onAdFailedToLoad(@NonNull final AdRequestError adRequestError) {
                // Ad failed to load with AdRequestError.
                // Attempting to load a new ad from the onAdFailedToLoad() method is strongly discouraged.
            }
        });
        loadRewardedAd();
    }

    private void loadRewardedAd() {
        if (mRewardedAdLoader != null ) {
            final AdRequestConfiguration adRequestConfiguration =
                new AdRequestConfiguration.Builder("your-ad-unit-id").build();
            mRewardedAdLoader.loadAd(adRequestConfiguration);
        }
    }
}

private void showAd() {
    if (mRewardedAd != null) {
        mRewardedAd.setAdEventListener(new RewardedAdEventListener() {
            @Override
            public void onAdShown() {
                // Called when an ad is shown.
            }

            @Override
            public void onAdFailedToShow(@NonNull final AdError adError) {
                // Called when an InterstitialAd failed to show.
            }

            @Override
            public void onAdDismissed() {
                // Called when an ad is dismissed.
                // Clean resources after Ad dismissed
                if (mRewardedAd != null) {
                    mRewardedAd.setAdEventListener(null);
                    mRewardedAd = null;
                }

                // Now you can preload the next interstitial ad.
                loadRewardedAd();
            }

            @Override
            public void onAdClicked() {
                // Called when a click is recorded for an ad.
            }

            @Override
            public void onAdImpression(@Nullable final ImpressionData impressionData) {
                // Called when an impression is recorded for an ad.
            }

            @Override
            public void onRewarded(@NonNull final Reward reward) {
                // Called when the user can be rewarded.
            }
        });
        mRewardedAd.show(this);
    }
}

@Override
protected void onDestroy() {
    super.onDestroy();
    if (mRewardedAdLoader != null) {
        mRewardedAdLoader.setAdLoadListener(null);
        mRewardedAdLoader = null;
    }
    destroyRewardedAd();
}

private void destroyRewardedAd() {
    if (mRewardedAd != null) {
        mRewardedAd.setAdEventListener(null);
        mRewardedAd = null;
    }
}