AdMob广告未在Google Play中展示

Question

广告仅在模拟器中以及我从APK安装应用时显示。但是，当我从Google Play下载此应用时，广告无法展示。 OnCreate：

super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    MobileAds.initialize(this,
            "ca-app-pub-8487255892576881~6132868827");

    mAdView = (AdView) findViewById(R.id.adView);
    AdRequest.Builder builder = new AdRequest.Builder();
    AdRequest ad = builder.build();
    mAdView.loadAd(ad);

    mInterstitialAd = new InterstitialAd(this);
    mInterstitialAd.setAdUnitId("ca-app-pub-8487255892576881/1584911850");
    mInterstitialAd.loadAd(new AdRequest.Builder().build());
    mInterstitialAd.setAdListener(new AdListener() {
        @Override
        public void onAdClosed() {
            // Load the next interstitial.
            mInterstitialAd.loadAd(new AdRequest.Builder().build());
        }

    });