This is an example that gives Android apps developed with Appcelerator Titanium much more parity with iOS' 'navBar'. I created this to reduce the amount of braching code I needed to write to get a functional Android App up and running.
The goal of this project is to allow to write code like win.rightNavButton = button on Android and have it work.
The current version supports a custom 'TabGroup' with a navBar above it and ads the following functions to Android windows.
title
titleControl
barImage
rightNavButton
leftNavButton
To create a window using this framework, just swap out Ti.UI.createWindow with require('xui').createWindow
On iOS, createWindow, createTab, and createTabGroup give you the same as if you used their Ti.UI functions. On Android, you get back a pure JS wrapper object - not a real Ti 'proxy' object. This shouldn't limit you much, but be aware.
There is still lots of work to do with this, and I'll be improving it as I use it in anger.