Depends on the range of Android versions you support and what your app does. I'm not an Android dev but I'm fairly certain if you all you want to do is display

Depends on the range of Android versions you support and what your app does. I'm not an Android dev but I'm fairly certain if you all you want to do is display some text it'll probably work fine across most versions of Android. If you are using some bleeding edge API you may have some issues. The "lets just release it" strategy isn't terrible. It's a trade off between your dev time of finding bugs pre-release and having users find them and what the impact is. If you take money you should make sure that process work on any version of your app that supports it. If the payment screen has some weird visual bug but functionally it works fine then it's probably okay for users to find. Cover your core cases on all versions you support, things outside of that can probably be passed on to users safely.