问即使在关闭应用程序后仍显示AdMob Interstitial广告

EN

new Handler().postDelayed(new Runnable() {
     @Override
     public void run() {
         interAd = new InterstitialAd(MainActivity.this);
         interAd.setAdUnitId("ca-app-pub-3940256099942544/1033173712");
         AdRequest adRequest = new AdRequest.Builder()
                 .addTestDevice("SEE_YOUR_LOGCAT_TO_GET_YOUR_DEVICE_ID")
                 .build();
         interAd.loadAd(adRequest);
         interAd.setAdListener(new AdListener() {
                @Override
                public void onAdLoaded() {
                    interAd.show();
         }
     });

     interAd.setAdListener(new AdListener() {
         @Override
        public void onAdClosed() {
            // Code to be executed when the interstitial ad is closed.
             Log.i("Ads", "onAdClosed");
            }
        });
    }
} , 20000);