Get Started AdMob for Android in Android Studio

AdMob uses the Google Mobile Ads SDK. This guide will show you how to integrate the Google Mobile Ads SDK into a brand new app and use it to display a simple banner ad. It should take about thirty minutes to complete and will give you a good sense of how the SDK functions within an app. If you're new to Google Mobile Ads, this is a great place to start before moving on to more advanced examples.

https://developers.google.com/admob/android/quick-start