我有一个应用程序，有两个活动（主要活动和学习活动）。第一个活动包含一个按钮。点击它会将用户导航到另一个屏幕。在导航到另一个屏幕之前，会显示中间广告。问题是当我关闭中间主活动时，它会在导航到学习活动之前出现1-2秒。如何修复？
这是我的主要活动课：

​​public class MainActivity extends AppCompatActivity {
  AdsManager adsManager;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
       loadAds();
    }

  void loadAds() {
    adsManager = new AdsManager(this);
  }

  public void onClick(View view) {
   switch (view.getId()) {
     case R.id.learnButton:
       Intent intent = new Intent(this, LearningActivity.class);
       if (adsManager != null) {
         adsManager.showAd(intent);
       } else {
         startActivity(intent);
       }
       break;
}

下面是我的adsmanager类：

class AdsManager {
  private InterstitialAd mInterstitialAd;
  private Context context;

  AdsManager(Context context) {
    this.context = context;
    MobileAds.initialize(context, context.getString(R.string.adMobAppId));
    mInterstitialAd = new InterstitialAd(context);
    mInterstitialAd.setAdUnitId(context.getString(R.string.adMobUnitId));
    Bundle extras = new Bundle();
    extras.putBoolean("is_designed_for_families", true);
    AdRequest.Builder builder = new AdRequest.Builder()
      .addNetworkExtrasBundle(AdMobAdapter.class, extras)
      .tagForChildDirectedTreatment(true);
    mInterstitialAd.loadAd(builder.build());
  }

  void showAd(Intent intent) {
    if (mInterstitialAd.isLoaded()) {
    mInterstitialAd.show();
    mInterstitialAd.setAdListener(new AdListener() {
      @Override
      public void onAdClosed() {
        context.startActivity(intent);
      }
      });
    }
    else {
      context.startActivity(intent);
    }
  }
}​