Hi guys,

I'm building an android app that provides several interactive adventures to the user. These use a lot of media (sound files and images, plus some xml), and therefore a lot of space.

I'm planning on a freemium model where the app is downloaded free with one adventure, and the user can buy more from Google Play.

What I'm wondering is:

1) How do I structure my app so as not to blow 50mb apk?

2) Does internal storage have a size limit?

3) The in-app billing examples I've seen all assume that it's for something trivial that's already in the app. How do I set it up so that an adventure is downloaded when it's purchased?

Anyone? ... Bueller? Nobody else has an app where the user buys something that they download?

1) Just use android project structure. I don't understand this question. If your app contains big files structure will do nothing.
2) Yes it has. Probably depending on device. In manifest file you can set property for application install on sd card.