Simple Android MVVM calculator demo/tutorial implemented in MVVM with Android Binding.Tutorial text: Visit Developer’s homepage [http://andytsui.wordpress.com/]Source code available in project homepage. [http://code.google.com/p/android-binding/]Android Binding is an Open Source Framework that supports Binding View to View Models via XML declaration. This helps to implement MVVM pattern with minimal coupling between View and Model. * Features # View Binding thru XML declarations # Model Validation thru Annotation syntaxes