QuickReturnHeader is a tiny Android library that implements the popular "quick return" design pattern for lists and scrollable content in general. In this pattern, which can be found for instance in the Google Keep app, the header hides as soon as we start scrolling down, and reappears inmediately (regardless of how far down the list we are) as soon as we scroll up again.
CurrencyEditText is an extension of Android's EditText view object. It is a module designed to provide ease-of-use when using an EditText field for gathering currency information from a user.