Admob in fragments

Question

I created an empty project with appcompact and tried to add to it the AdMob block

fragment_main.xml

Answer 1

THIS IS THE ANSWER ... you will write root before the findViewById. That's all

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

Answer 2

You have

View rootView = inflater.inflate(R.layout.fragment_main, container,
                false);
return rootView; // remove this
adView = new AdView(getActivity()); // this is unreachable coz you have return above.

The return at the end of onCreateView is fine