How to enable some extra functionality for paid app alone in android?
<p>I developed one application. I planed to release that as a free app in market, also I want to add some extra functionality in a same app as a paid app. But I want to release only one apk in that, I have one button in a my free app, so user when click that it will show message like to enable this you have to buy this app. My problem is after the user bought my app I have to dismiss that message and  enable that functionality within the my app as programmatic.Is it possible?, and How do I know user bought my apps?</p>

<p>Thanks,</p>

<p>Lakshamanan</p>
