Admob 插页式广告未关闭

如何解决Admob 插页式广告未关闭

我在我的应用程序中显示插页式广告，并且广告正在加载和完美显示，但问题是当我点击后退按钮上的十字按钮时广告没有关闭我必须退出我的应用程序才能关闭它们 我创建了一个新项目并检查了新项目中的广告，它们工作正常并关闭后退按钮，但在我的主应用程序中，广告一旦显示给用户就不会关闭 这是我的 Admob 课程

public class Admob {

    public static InterstitialAd mInterstitial; // Interstital
    private static AdView mAdView; // banner

    public static void createLoadInterstitial(final Context context,View view)

    {

        mInterstitial = new InterstitialAd(context);
        mInterstitial.setAdUnitId(context.getResources().getString(
                R.string.admob_showIntersitial_ad_unit_id));
        mInterstitial.setAdListener(new AdListener() {
            @Override
            public void onAdLoaded() {
                // TODO Auto-generated method stub
                showInterstitial();
            }

            @Override
            public void onAdFailedToLoad(int errorCode) {
                // TODO Auto-generated method stub

                super.onAdFailedToLoad(errorCode);
            }

            @Override
            public void onAdOpened() {
                // TODO Auto-generated method stub
                super.onAdOpened();

            }

            @Override
            public void onAdClosed() {
                // TODO Auto-generated method stub
                super.onAdClosed();

            }

            @Override
            public void onAdLeftApplication() {
                // TODO Auto-generated method stub
                // Called when an ad leaves the app (for example,to go to the
                // browser).

                super.onAdLeftApplication();
            }

        });

        loadInterstitial();

    }

    public static void loadInterstitial() {

        mInterstitial.loadAd(new AdRequest.Builder().
                addTestDevice("").//ca-app-pub-3940256099942544/1033173712
                build());
    }

    public static void showInterstitial() {
        if (mInterstitial.isLoaded()) {
            mInterstitial.show();
        }
    }

    public static void createLoadBanner(final Context context,View view) {
        mAdView = (AdView) view.findViewById(R.id.adView);
        AdRequest adRequest = new AdRequest.Builder().
                addTestDevice("").//ca-app-pub-3940256099942544/6300978111
                build();
        mAdView.loadAd(adRequest);

        mAdView.setAdListener(new AdListener() {

            @Override
            public void onAdLoaded() {
                // TODO Auto-generated method stub


                super.onAdLoaded();
            }

            @Override
            public void onAdClosed() {
                // TODO Auto-generated method stub

                super.onAdClosed();

            }

            @Override
            public void onAdOpened() {
                // TODO Auto-generated method stub

                super.onAdOpened();
            }

            @Override
            public void onAdLeftApplication() {
                // TODO Auto-generated method stub


                super.onAdLeftApplication();
            }

            @Override
            public void onAdFailedToLoad(int errorCode) {
                // TODO Auto-generated method stub


                super.onAdFailedToLoad(errorCode);
            }

        });

    }

}

这就是我在我的活动中展示它们的方式

 MobileAds.initialize(this,"ca-app-pub-3940256099942544~3347511713");

        Admob.createLoadInterstitial(this,null);

我也在 Mainfest 中初始化了这个

  <meta-data
            android:name="com.google.android.gms.ads.APPLICATION_ID"
            android:value="ca-app-pub-3940256099942544~3347511713" />

我在 stackoverflow 上看到了同样的问题，但没有一个问题得到解决，因此非常感谢任何帮助