public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getSupportActionBar().hide();
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main);
///////////////////////////////
                //MobileAds.initialize(this,"ca-app-pub-3940256099942544/5224354917");
        MobileAds.initialize(this, new OnInitializationCompleteListener() {
            @Override
            public void onInitializationComplete(InitializationStatus initializationStatus) {
                //RewardedAd.load();
            }
        });
                AdRequest adRequest = new AdRequest.Builder().build();
//ca-app-pub-6779580915401561/1392653660
        RewardedAd.load(this, "ca-app-pub-3940256099942544/5224354917",
                adRequest, new RewardedAdLoadCallback(){
                    @Override
                    public void onAdFailedToLoad(@NonNull LoadAdError loadAdError) {
                        // Handle the error.
                        Log.d(TAG, loadAdError.getMessage());
                        mRewardedAd = null;
                    }

                    @Override
                    public void onAdLoaded(@NonNull RewardedAd rewardedAd) {
                        mRewardedAd = rewardedAd;
                        Log.d(TAG, "Ad was loaded.");
                    }
                });

        mRewardedAd.setFullScreenContentCallback(new FullScreenContentCallback() {
            @Override
            public void onAdShowedFullScreenContent() {
                // Called when ad is shown.
                Log.d(TAG, "Ad was shown.");
                mRewardedAd = null;
            }

            @Override
            public void onAdFailedToShowFullScreenContent(AdError adError) {
                // Called when ad fails to show.
                Log.d(TAG, "Ad failed to show.");
            }

            @Override
            public void onAdDismissedFullScreenContent() {
                // Called when ad is dismissed.
                // Don't forget to set the ad reference to null so you
                // don't show the ad a second time.
                Log.d(TAG, "Ad was dismissed.");
            }
        });