Licence check for a pro key

Question

So I would like to make a free app with full functionality loaded in. The pro functionality will be disabled until the app detects a licensed pro key. And of course I would like

Answer 1

@MainApp

@KeyApp

Create LvlValidationHandler.class that contains:

Intent i = new Intent("myapp.action.VALIDATION_RESPONSE");
sendBroadcast(i);