Develop Reference

Huge difference in admob Requests and Impressions, is my code placement wrong?

I am using admob Interstitial ads in one of my app and getting a huge difference in Requests and Impressions. With 1.1 million requests I'm getting only 256K impressions. I generally load an Interstitial ad when user clicks the back button. Is my code placement wrong or what could be the possible reason behind this? I am using admob only, no mediation.
public void onBackPressed() {
super.onBackPressed();
if(interstitialAd.isLoaded()){
interstitialAd.show();
}
else{
finish();
}
}

Yep, I had the same issue at first. You said that you load the Ad when the user clicks the back button.
Always load the ad at the beginning of the activity so that when the click method gets activated, the Ad is already available.
My ad is now at 99.73 percent after I made that change.
Good luck :)

I hope you get the point
Ad requests are the number of times the app requested ads from AdMob.
Ad impressions are the number of times at least 1 pixel of the ads are shown at the app.
There are always a difference between those metrics due to many cases like slow internet connection at which user wouldn't be served or shown the ads even though the ad requests are made to AdMob. Hence you see the difference.
The request is an attempt to show an ad. Potential advertisers may buy or not this particular requests, it could be filled with an ad or not.
The impression is counted after the ad has been delivered to the user's browser.

Admob ad request always return code 3

I implement Admob in one of my android application. First time it has a banner add bellow of my application. But after adding banner ad in RecylearView after 8 items then problem occurs. 90% cases it returns response code 3.
Maximum time it showing me:
I/Ads: No fill from ad server.
W/Ads: Failed to load ad: 3
Here response code: 3 means The ad request was successful, but no ad was returned due to lack of ad inventory. But other apps showing ads frequently in same device.
Notes:
It showing demo ad when i test in TestDevice
Problem occurring only non test devices
Rare cases it successfully return ad.
Can anyone please help me to recover from this issue.Is there any issue in my ad_unit or adMob?

Here my code is correct. The issue is that AdMob does not always have an ad to return for every request. This may happen particularly if you have just registered your AdMob publisher ID, as it takes some time and multiple requests before the new ID starts returning ads.
Another reason your fill rate may be low is that you don't have AdSense backfill enabled, or you have filtered out some ads. Check your app settings to see if that is the case.
According to documentation :-
public static final int ERROR_CODE_NO_FILL
The ad request was successful, but no ad was returned due to lack of ad inventory.
Constant Value: 3
Which means:-
If you are getting this error, then your code is correct. The issue is
that AdMob does not always have an ad to return for every request.
This may happen particularly if you have just registered your AdMob
publisher ID, as it takes some time and multiple requests before the
new ID starts returning ads.
Another reason your fill rate may be low is that you don't have
AdSense backfill enabled, or you have filtered out some ads. Check
your app settings to see if that is the case.
Thanks :)

Getting Ad request successful, but no ad returned due to lack of ad inventory error for loading DFP ads in Nexus 7 device

I am unable to load DFP ads in Nexus 7 tablet device. I am getting failed message:
Ad request successful, but no ad returned due to lack of ad inventory
Using SMART_BANNER adsize I have tested on some smart phones(Google nexus,nexus 5,s3,s4) and Samsung 10 tablet, it works perfectly in all devices but in Nexus 7 ad failed to load due to the lack of ad inventory.
My xml code snippet
<com.google.ads.doubleclick.DfpAdView
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:id="#+id/adView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
ads:adUnitId="MY_AD_UNIT_ID"
ads:adSize="SMART_BANNER"
ads:loadAdOnCreate="true"/>

Here my code is correct. The issue is that AdMob does not always have an ad to return for every request. This may happen particularly if you have just registered your AdMob publisher ID, as it takes some time and multiple requests before the new ID starts returning ads.
Another reason your fill rate may be low is that you don't have AdSense backfill enabled, or you have filtered out some ads. Check your app settings to see if that is the case.
According to documentation :-
public static final int ERROR_CODE_NO_FILL
The ad request was successful, but no ad was returned due to lack of ad inventory.
Constant Value: 3
If you are getting this error, then your code is correct. The issue is that AdMob does not always have an ad to return for every request. This may happen particularly if you have just registered your AdMob publisher ID, as it takes some time and multiple requests before the new ID starts returning ads.
Another reason your fill rate may be low is that you don't have AdSense backfill enabled, or you have filtered out some ads. Check your app settings to see if that is the case.

android interstitial ad is not diplaying

android interstitial ad is displaying for test device
AdRequest adRequest = new AdRequest.Builder()
.addTestDevice("XXXXXXXXXXXXXX")
.build();
interstitial.loadAd(adRequest);
But after publishing(removed the "addTestDevice" line), I cannot see any ad. It always returns error code "ERROR_CODE_NO_FILL".(from logcat)
I searched a lot, but couldn't get a satisfactory answer. Is it one of the android's million bugs?
The below is my admob dashboard screenshot. It has some few requests, but no impression. This is not due to my code problem as I am displaying the ad, but loading itself fails after request : ERROR_CODE_NO_FILL

NO_FILL is a standard response. It means that you made a request on the ad network and the ad network has no inventory for you.
The solution is to use mediation to hand off to other ad networks when the first doesn't have any fill. Admob provides a good out of the box mediation.

Cannot test the admob API throws Ad failed error

When I try to test the Admob api I get the following error in my logcat.
Ad failed: com.google.ads.AdView{40db6b18 V.E..... ......I. 0,0-480,610 #7f070001 app:id/adView}Ad request successful, but no ad returned due to lack of ad inventory.

Admob can return a blank ad (depends on targeting, user preferences etc), there is a fill rate in admob less then 100%, my suggestion to you - create some "house ads" that will return when you ads are blank.
*Or simply add some test ads, as i remember you can find such a feature in admob.

Your Logcat showing (no ad returned due to lack of ad inventory). It Clearly means that admob is not serving any advertisement to your app at that time.
It is probably because of the fill rate.
You can use AdSense to help backfill ads when AdMod does not have any available.