装有Android的AdMob无法展示广告并返回错误代码3

Question

I created in AdMob an application to get ad id. Everything worked ok and advertising was shown. After I published the application in Play advertising stopped showing up. Returns "code code 3". But if this ads id I used in another application then the advertisement is shown. And the original application does not work advertising not with one of the other ads id. I think may app package may be blocked, but I have not notification for it.

Answer 1

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.