How do I call a JAVA code when the user starts the app?

I want to integrate Appodeal's ad network (new network with highest eCPM on the market right now, around $10 ecpm). They already created the cordova plugin and I managed to use it when building through intel XDK. However, I don't know how to initialize the Appodeal SDK.

Here's their documentation (click on phonegap): http://www.appodeal.com/sdk/

Apparently all is needed to do, after importing the cordova plugin, is to initialize the SDK by calling this code:

String appKey = "fee50c333ff3825fd6ad6d38cff78154de3025546d47a84f";
          Appodeal.initialize(appKey);[/code:27e5urhq]

However, that is JAVA and not JavaScript, so I have no idea where to place that in order to get called when the user starts the app.

If I can get the SDK to initialize then I can call the ads by using Execute Javascript within construct 2 (for example: Appodeal.show(adTypes); ).