This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
I'm not quite sure what you're asking. You can charge for an app up front, or make it free. You can implement in-app billing. You can combine that with some form of licensing. And there's DirectCarrierBilling to make payments simpler for the user.
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com
subject: Different Types oF Payments that can be implemented in an Android Application