After I publish my game in google play and download from play store, I'am waiting for my banner ads to come up and unfortunately it doesn't showing up... but when I include the build.adTest(); when I trying the game/app the ads shows. What do you think is the problem or do admob take some time to show their live/real ads?
According to Google
"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. If you are receiving test ads then your implementation is fine. Just wait a few hours and see if you are able to receive live ads then. If not, can send us your Ad Unit ID for us to look into."
https://groups.google.com/forum/#!category-topic/google-admob-ads-sdk/android/fBe3YL3ffpo
so wait for a few hours.