How to get AdView banner height

I'm using Admob AdView (adaptive banner), and I want to get the height of the banner. the banner defined like this:

private AdSize getAdSize() { //https://developers.google.com/admob/android/banner/adaptive
    // Step 2 - Determine the screen width (less decorations) to use for the ad width.
    Display display = getWindowManager().getDefaultDisplay();
    DisplayMetrics outMetrics = new DisplayMetrics();
    display.getMetrics(outMetrics);

    float widthPixels = outMetrics.widthPixels;
    float density = outMetrics.density;

    int adWidth = (int) (widthPixels / density);

    // Step 3 - Get adaptive ad size and return for setting on the ad view.
    return AdSize.getCurrentOrientationAnchoredAdaptiveBannerAdSize(this, adWidth);
  }


  mAdView = new AdView(getContext());
  mAdView.setAdUnitId("00000000000000000000");

    AdSize adSize = new AdSize(getAdSize().getWidth(), (int) ((getAdSize().getHeight()/3)*2.5));//I want the banner to be a bit smaller than returned.

    mAdView.setAdSize(adSize);
    List<String> testDeviceIds = Arrays.asList("00000000000000");
    RequestConfiguration configuration =
            new RequestConfiguration.Builder().setTestDeviceIds(testDeviceIds).build();
    MobileAds.setRequestConfiguration(configuration);

    //insert adView to wrap_content container
    con.addView(mAdView);
    adRequest = new AdRequest.Builder().build();
    mAdView.loadAd(adRequest);

But the problem is:
this expression: (int) ((getAdSize().getHeight()/3)*2.5) returns 52 in my case. but its not the real size of the banner. (he is bigger). I tried to print banner's height on click and It turns out that he is actually 136px.

Is it setAdSize() bug? (or maybe it because the ad resolution)?
However , how can I get the real height before banner loaded? (without waiting for banner loading like getViewTreeObserver().addOnGlobalLayoutListener() that not working either btw).

I tried using : mAdview.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED); and mAdView.getMeasuredHeight() but it returns 0.

And I tried getHeight() inside getViewTreeObserver().addOnGlobalLayoutListener() and inside onAdLoaded() (even that I want to know the height before loading) but it still 0.

In summary:
I have 2 questions:

1. I can see that the banner's height is not 52 as returned from (int) ((getAdSize().getHeight()/3)*2.5). so why setAdSize() is faking values? (and how to avoid it)
2. And how can I get the real shown height?

Thanks in advance.

The constructor for AdSize (int width, int height):

width: The width of the ad in density-independent pixels.

height: The height of the ad in density-independent pixels.