Summary

Data binding can not only massively reduce the amount of boilerplate code required to write a user interface, but can actively improve your code base and increase how much code you can reuse. By avoiding complex binding expressions and encapsulating the display logic in your presenter classes, you can build highly modular layouts that are fast, type-safe, and reusable.

It's sometimes useful to think of the data-bound layout files as Java classes in their own right; after all, they will each result in a generated Binding class. It's useful to keep in mind that the Binding classes themselves are also observable, so any changes to them through their generated setter methods will automatically trigger an update in the user interface as well. Also, remember that when you include a data-bound layout in another, you need to pass all of its variables downward, which is just like specifying arguments on a constructor, and those variables don't need to be directly contained within the parent...