Before setting up the Adobe Air SDK, you must generate the appropriate credentials for the platform(s) you are releasing on:
Android - Generate a Google Server API Key
There is currently no first-party Adobe Air SDK. You may use one of the following options to build your Adobe Air app:
Enables the use of push notifications for Adobe AIR with a single simplified API making it easy for AIR developers to integrate push notifications in their applications.
Purchase the Air Native Extension on this page
There is also a free and open source Adobe Air plugin for OneSignal available here.