Adwords not displaying in android app <p>I have added the code for displaying Adwords ad in my android app</p> <pre><code>MobileAds.initialize(getApplicationContext(),"ca-app-key"); AdView mAdView = (AdView) findViewById(R.id.adView); AdRequest adRequest = new AdRequest.Builder() .build(); mAdView.loadAd(adRequest); </code></pre> <p>After publishing my app in Android playstore and downloading it from there to check whether ads are appearing, i see no ads.I don't understand what is going wrong here.</p>