Agfdhyk

Remove the line that says

.addTestDevice("4CCC00EF4EA205A6FE82E1AEB26B0839")

Also, when you use a virtual device, it shows the test ads no matter what. Are you testing it on a real device?

"It could be that you have only recently created a new Ad Unit ID and requesting for live ads. It could take a few hours for ads to start getting served if that is that case."

I faced the same problem, if you can show test ads, it's fine, live ads will be showed soon (of course after you removed .addTestDevice(...) ).

I guess that google need time to collect some information (location, age, gender...) to show properly ads that can interest user.

May be you know but NEVER forget: DON NOT touch the live ads, you will be banned soon.

https://groups.google.com/forum/#!category-topic/google-admob-ads-sdk/android/fBe3YL3ffpo

You might be using the sample unit id: ca-app-pub-3940256099942544/6300978111

If you use above then you will see test ads.

Make sure you change to your own unit id before releasing the app.

If you have removed:

.addTestDevice()

Then, make sure you are using the same ID that AdMob gave you in your string.xml file

AdMob ID page

Look at your logcat. It will say why real ads are not being shown.

It's probably because there are none available to show for your device, in your location, right now.

To create a Live Ad unit id

Sign In to

https://apps.admob.com

1. in the left side menu click on ->Apps
   


2. add app


3. choose whether you have published your app on Google Play or the App Store


4. if no -> Enter your app information


5. Create Ad unit


6. replace the test Ad unit with the new Ad unit.


7. you get to see the AD once the app is published to playstore!

inside your xml add AdView

  <com.google.android.gms.ads.AdView 

    xmlns:ads="http://schemas.android.com/apk/res-auto"

    android:id="@+id/adView"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"



    android:layout_alignParentBottom="true"

    android:layout_centerHorizontal="true"

    ads:adSize="BANNER"

    ads:adUnitId="@string/banner_ad_unit_id">

  </com.google.android.gms.ads.AdView>

inside Strings
<string name="banner_ad_unit_id">your_new_ad_unit</string>

in your java code

 AdView mAdView = (AdView) v.findViewById(R.id.adView);

 AdRequest adRequest = new AdRequest.Builder().build();

 mAdView.loadAd(adRequest);

If you chose the Native Express template then use this link. NativeExpressAdView won't work with AdView. https://firebase.google.com/docs/admob/android/native-express

NativeExpressAdView adView = (NativeExpressAdView)findViewById(R.id.adView);



<com.google.android.gms.ads.NativeExpressAdView

    android:id="@+id/adView"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    ads:adUnitId="ca-app-123123123123/123123123"

    ads:adSize="320x150">

</com.google.android.gms.ads.NativeExpressAdView>

I also was faced with this problem. AdView and IntersitialAd showed me only test advertisements on the simulator. But there were real advertisements on the real device.
I think that firebase can detect if you use the simulator or the real device. I've used firebase:

com.google.firebase:firebase-ads:11.0.4

Actually, I also faced this problem. You have to log in to admob and go to the app you added there. That app has an admob id. Use the id of the app to do these steps.
Then create a new banner or whatever type of ad in that app (in admob) and use the id of that banner to complete these steps. When you create a banner, it will give you the instructions itself.