Admob interstitial ad won't display

Question

I used to display AdMob banner on my future apps, and I\'d like to give a try to the interstitial ads.

I checked the AdMob SDK for implementation, and I copied their

Answer 1

mInterstitialAd = new InterstitialAd(this);
                mInterstitialAd.setAdUnitId("Your Interstitial Id ca-app-pub-46563563567356235/3452455");
                AdRequest adRequest1 = new AdRequest.Builder()
                        .build();
                mInterstitialAd.loadAd(adRequest1);
                mInterstitialAd.setAdListener(new com.google.android.gms.ads.AdListener() {
                    @Override
                    public void onAdLoaded() {
                        mInterstitialAd.show();
                        super.onAdLoaded();

                    }
                });