I have fishished an android project and set up admob ads but it's not working, tried on emulator and phone. So how to check if admob works?

Code:

    admobView = new AdView(this, AdSize.BANNER, "Top secret");
    RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
            RelativeLayout.LayoutParams.WRAP_CONTENT,
            RelativeLayout.LayoutParams.WRAP_CONTENT);
    lp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
    admobView.setLayoutParams(lp);

    RelativeLayout layout = new RelativeLayout(this);
    layout.addView(renderView);
    layout.addView(admobView);
    admobView.loadAd(new AdRequest());
    setContentView(layout);

The app works fine(renderView) but I have no idea if adView does. And yes, the admob ID is right.

android admob
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