rewarded video google admob

private RewardedVideoAd AdMobrewardedVideoAd;

// AdMob Rewarded Video Ad Id
private String AdId
        = "ca-app-pub-3940256099942544/5224354917";

void loadRewardedVideoAd()
{
    // initializing RewardedVideoAd Object
    // RewardedVideoAd  Constructor Takes Context as its
    // Argument
    AdMobrewardedVideoAd
            = MobileAds
            .getRewardedVideoAdInstance(getApplicationContext());

    // Rewarded Video Ad Listener
    AdMobrewardedVideoAd.setRewardedVideoAdListener(
            new RewardedVideoAdListener() {
                @Override
                public void onRewardedVideoAdLoaded()
                {
                    // Showing Toast Message
                    Toast.makeText(getApplicationContext(),
                                    "onRewardedVideoAdLoaded",
                                    Toast.LENGTH_SHORT)
                            .show();
                }

                @Override
                public void onRewardedVideoAdOpened()
                {
                    // Showing Toast Message
                    Toast
                            .makeText(getApplicationContext(),
                                    "onRewardedVideoAdOpened",
                                    Toast.LENGTH_SHORT)
                            .show();
                }

                @Override
                public void onRewardedVideoStarted()
                {
                    // Showing Toast Message
                    Toast
                            .makeText(getApplicationContext(),
                                    "onRewardedVideoStarted",
                                    Toast.LENGTH_SHORT)
                            .show();
                }

                @Override
                public void onRewardedVideoAdClosed()
                {
                    // Showing Toast Message
                    Toast
                            .makeText(getApplicationContext(),
                                    "onRewardedVideoAdClosed",
                                    Toast.LENGTH_SHORT)
                            .show();
                }

                @Override
                public void onRewarded(
                        RewardItem rewardItem)
                {
                    // Showing Toast Message
                    Toast
                            .makeText(getApplicationContext(),
                                    "onRewarded",
                                    Toast.LENGTH_SHORT)
                            .show();
                }

                @Override
                public void
                onRewardedVideoAdLeftApplication()
                {
                    // Showing Toast Message
                    Toast
                            .makeText(getApplicationContext(),
                                    "onRewardedVideoAdLeftApplication",
                                    Toast.LENGTH_SHORT)
                            .show();
                }

                @Override
                public void onRewardedVideoAdFailedToLoad(
                        int i)
                {
                    // Showing Toast Message
                    Toast
                            .makeText(
                                    getApplicationContext(),
                                    "onRewardedVideoAdFailedToLoad",
                                    Toast.LENGTH_SHORT)
                            .show();
                }

                @Override
                public void onRewardedVideoCompleted()
                {
                    // Showing Toast Message
                    Toast
                            .makeText(
                          getApplicationContext(),
                                    "onRewardedVideoCompleted",
                                    Toast.LENGTH_SHORT)
                            .show();
                }
            });

    // Loading Rewarded Video Ad
    AdMobrewardedVideoAd.loadAd(
            AdId, new AdRequest.Builder().build());
}

public void showRewardedVideoAd()
{
    // Checking If Ad is Loaded or Not
    if (AdMobrewardedVideoAd.isLoaded()) {
        // showing Video Ad
        AdMobrewardedVideoAd.show();
    }
    else {
        // Loading Rewarded Video Ad
        AdMobrewardedVideoAd.loadAd(
                AdId, new AdRequest.Builder().build());
    }
}



// In onCreate()

MobileAds.initialize(this);

loadRewardedVideoAd();


// where you want to show ad

showRewardedVideoAd();