Data Binding Support Library

developer.android.com/tools/data-binding

/guide.html1

Data Binding Engine

- Declarative layouts(implicit data/command binding)

- Minimize app logic-to-layout binding code

- Model View ViewModel (MVVM)

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Model View ViewModel

- used in Microsoft frameworks with XAML as binding language

- Variant of MVC pattern

- M : domain model- V : view- VM : mediator, binds view, reacts to events

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Specs & Syntax

- Support Lib Android 2.1(API 7+)

- Beta Release : Android Studio 1.3.0-beta1+

- <layout> <data> <variable> <import>

- “@{ }” “@{user.firstName}” 6

Allowed / Disallowed Syntax

- math, string concat- logical, binary,

unary, ternary, shift- instanceof, cast,

method call- grouping, field and

array access- literals, comparisons

- this- super- new- explicit generic

invocation

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Layout and Variable Bind Example

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Import and Static Method Call Example

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Data Object- POJO/Beans modification doesn’t update UI

- <variable> types inspected on compile, must implement Observable via BaseObservable and @Bindable

- Observable, Observable Field, Observable Collection : are notified on data change

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Data Object and Observable Examples

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Why?

- fragments traditionally create, bind, configure views, and hold the domain logic; can be limited to binding

- UIs react to changes in the ViewModel, asynchronous updates on the UI thread and from background threads ∴ responsive UI

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Why Continued

- HTTP/2 Request and Response Multiplexing

- Increase in local and remote inter-process communication as apps get more complex, and as they get more connected(IoT, Bluetooth, Wifi)

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