AppOpenAdManager is just a simple wrapper to handle the new AppOpenAd Format by AdMob (Google).
If you look at the tutorial, you'll see the detailed guide to create a Helper Class to manage AppOpenAd.

The wrapper should have been included in the core Ads SDK itself but it wasn't, So I ended up creating the wrapper!
All that boilerplate, now wrapped to a Single line of Code for the developer.

val latest_version:1.0

Gradle:

implementation 'com.lazygeniouz:aoa_manager:$latest_version'`

Maven:

<dependency>
  <groupId>com.lazygeniouz</groupId>
  <artifactId>aoa_manager</artifactId>
  <version>$latest_version</version>
  <type>pom</type>
</dependency>

Kotlin:

AppOpenManager(this, InitialDelay.NONE, adUnitId, adRequest, orientation)

Java:

new AppOpenManager(App.this, InitialDelay.NONE, adUnitId, adRequest, orientation);

The constructor arguments are:

• @NonNull application: Application
  Your class extending android.app.Application

• @NonNull initialDelay: InitialDelay
  You can specify an Initial Delay to load & display the Ad for the first time.
  If you do not need a delay, simple pass InitialDelay.NONE
  But it is a good practise to allow the user to first explore the App &
  therefore 1 Day should be fine which is also the Default if you pass InitialDelay()

• adUnitId: String
  Your adUnitId
  (Optional for Testing) Default is a Test AdUnitId

• adRequest: AdRequest
  (Optional) If you have a customised AdRequest

• orientation: Int
  (Optional) Default is AppOpenAd.APP_OPEN_AD_ORIENTATION_PORTRAIT
  Available variables are:
  AppOpenAd.APP_OPEN_AD_ORIENTATION_PORTRAIT
AppOpenAd.APP_OPEN_AD_ORIENTATION_LANDSCAPE