AdMob横幅在60秒后显示

Question

在LogCat中，我看到Scheduling ad refresh 60000 milliseconds from now.消息，然后在1分钟后，当我启动应用程序时横幅显示。这是我的代码：

        DisplayMetrics displaymetrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
        int screenWidth = displaymetrics.widthPixels;
        int screenHeight = displaymetrics.heightPixels;
        LinearLayout.LayoutParams adParams = new LinearLayout.LayoutParams(screenWidth, 2 * screenHeight - 75);

         // Create an ad.
        adView = new AdView(this);
        adView.setAdSize(AdSize.BANNER);
        adView.setAdUnitId(AD_UNIT_ID);

        // Create an ad request. Check logcat output for the hashed device ID to
        // get test ads on a physical device.
        AdRequest adRequest = new AdRequest.Builder()
            .addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
            .addTestDevice("INSERT_YOUR_HASHED_DEVICE_ID_HERE")
            .build();

        // Start loading the ad in the background.
        adView.loadAd(adRequest);

        // Adding full screen container
        addContentView(adView, adParams);

如何在加载完成后立即显示横幅？