I have two ad units, both for banner. I am trying to load ads in my app whilst registering as a testing device as well.
adView = (AdView) view.findViewById(R.id.adView);
AdRequest.Builder builder = new AdRequest.Builder();
builder.addTestDevice("F8043E524DAF655DB25E042650FFAA54");
adView.loadAd(adRequest);
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clipChildren="true"
android:clipToPadding="true"
android:orientation="horizontal">
<com.google.android.gms.ads.AdView
android:id="@+id/adView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
ads:adSize="BANNER"
ads:adUnitId="@string/banner_ad_unit_id_2" />
</RelativeLayout>
And this is the result of Logcat
I/Ads: Starting ad request.
I/Ads: This request is sent from a test device.
I/Ads: No fill from ad server.
W/Ads: Failed to load ad: 3