Hello! Let's adapt the Eclipse Data Binding library for Android App programming. It s great. Steffen Nowacki, PartMaster _Rostock/Germany_2011

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1 Hello! Let's adapt the Eclipse Data Binding library for Android App programming. It s great. 2004

2 Problem (without Data binding ): The view can loose its state when rotating

3 Solution (approach) Monolith App 1. Introduce a model and separate it from the view. 2. Keep both in sync with data binding. View Data binding Model

4 Solution (model)

5 Solution (beans) Spec Coding Reflection List Matury Effort Use Support JAVA BEAN POJO UFACEKIT UBEAN EMF EOBJECT Code Size

6 Solution (binding library) General data binding Avoids boilerplate code Simplifies MVC architectures Supports validation and convertion Eclipse data binding Widgetkit agnostic Adapted for SWT/JFace, RAP, GWT, Swing Broadly proven in use

validation and convertion Eclipse data binding Widgetkit

target = AndroidObservables.observeChecked(button); IObservableValue model = BeansObservables.

7 Solution (binding code) public class MyBinding { private DataBindingContext databindingcontext = new DataBindingContext(); public Binding bind(compoundbutton button, AppState state) { IObservableValue target = AndroidObservables.observeChecked(button); IObservableValue model = BeansObservables.observeValue(state, "running"); Binding binding = databindingcontext.bindvalue(target, model); return binding; } }

8 Concepts IObservableValue target = AndroidObservables.observeChecked(button); IObservableValue model = BeansObservables.observeValue(state, "running"); Binding binding = databindingcontext.bindvalue(target, model); IObservableValue Observables Binding DataBindingContext

observeValue(state, "running"); Binding binding = databindingcontext.

9 Concepts (ObservableValue) IObservableValue target = AndroidObservables.observeChecked(button); IObservableValue model = BeansObservables.observeValue(state, "running"); Binding binding = databindingcontext.bindvalue(target, model); Wrapper with unified interface for property values

10 Concepts (Observables) IObservableValue target = AndroidObservables.observeChecked(button); IObservableValue model = BeansObservables.observeValue(state, "running"); Binding binding = databindingcontext.bindvalue(target, model); Factories for observable values

11 Concepts (Binding) IObservableValue target = AndroidObservables.observeChecked(button); IObservableValue model = BeansObservables.observeValue(state, "running"); Binding binding = databindingcontext.bindvalue(target, model); Synchronizer for a widget property and a bean property

12 Concepts (DataBindingContext) IObservableValue target = AndroidObservables.observeChecked(button); IObservableValue model = BeansObservables.observeValue(state, "running"); Binding binding = databindingcontext.bindvalue(target, model); Factory for bindings

13 Tasks 1. Create a data binding adapter for Android widgets. 2. Patch original Eclipse data binding JARs for usage with ProGuard

14 Task 1: Adapter A. Two special classes B. One wrapper class per widget property

15 Task 2: Patch Strip unsupported and unused classes 70 kb icu.base.jar 104 kb equinox.common.jar core.databinding.jar databinding.property.jar databinding.observable.jar 179 kb 165 kb 290 kb

16 Prototype Two knock-out criteria : 1.Performance goes down 2.App size goes up

17 Results (criteria) Criterion 1 (size) about 1MB (without shrinking) about 50KB (with shrinking) Shrinking is a MUST! Criterion 2 (performance) Not noticable

18 Results (experiences) Encourages clean code and is fun Learning effort is needed Debug into internals is difficult

19 Summary Real problem solution Great features No knock-out Criteria + =

20 Let's start the Android adapter for Eclipse data binding project: github.com/nowacki/databinding Thank you

Enterprise Application Development In Java with AJAX and ORM

Enterprise Application Development In Java with AJAX and ORM ACCU London March 2010 ACCU Conference April 2010 Paul Grenyer Head of Software Engineering p.grenyer@validus-ivc.co.uk http://paulgrenyer.blogspot.com