Droidcon 2011: Effective android programming with object forms

transcript

Effective Android Programming with ObjectForms

Pavel Lahoda, droidcon Berlin 2011čtvrtek, 24. března 2011

čtvrtek, 24. března 2011

2010 : year when demand for mobile application development exploded.

So many development projectsSo little time

Solution ?Be Effective !

What effective means ?

Make less steps

No detours

Releasing application is great feeling, but...

...think about the entire lifecycle

Create no holes

Use right tools

Java IDE is your best friend

“The most powerful tool for detecting and revealing errors is your compiler. No XML files should be used and code should be written in a way that gives the compiler the opportunity of performing this task as good as possible.”

Apache.orgThe principle of string-free coding

Encapsulate your components

Strings are nasty beasts

XML Space invaders

Avoid excessive typingchevron |ˈ sh evrən|nouna line or stripe in the shape of a V or an inverted V, esp. one on the sleeve of a uniform indicating rank or length of service.

ORIGIN late Middle English (in heraldic use): from Old French, based on Latin caper ‘goat’ ; compare with Latin capreoli (diminutive of caper) used to mean ‘pair of rafters.’

chevronitis |ˈ sh evrənitis|nouna a disease characterized by obsessive typing of strange characters on the computer keyboard, such as chevrons.

ORIGIN late 20th century fell in love of typing enormous amounts of chevrons and other strange characters while “programming”, causing a lot of weird injuries to fingers and hands.

-itissuffixforming names of inflammatory diseases : cystitis | hepatitis.• informal used with reference to a tendency or state of mind that is compared to a disease : creditcarditis.ORIGIN from Greek feminine form of adjectives ending in -itēs (combined with nosos ‘disease’ implied).

Chevronitis hurts

Alternative ? Meet custom ViewGroup

Empty ViewGroup

ViewGroup constructedčtvrtek, 24. března 2011

ViewGroup layout()

Not quite working yet...

ViewGroup onMeasure()čtvrtek, 24. března 2011

That’s a lot of Java code !

Reflection to the rescue

Simplified ViewGroup

How AVG works

Inside ViewGroupHelper

AVG Usage

Need more declarative control ?Annotations !

Already learned a lot of principles

Time to take it to the next level

Keep it simple

Don’t repeat yourself

Introducing ObjectForms

www.objectforms.comčtvrtek, 24. března 2011

Trivial Examplečtvrtek, 24. března 2011

Hello Worldčtvrtek, 24. března 2011

More declarative

Sample application

Inside the Sample application

Both modes for free

Auto Portrait mode

Both modes for free

Auto Portrait mode Auto Landscape mode

Object Encapsulation Examplečtvrtek, 24. března 2011

Objects as members within Objectčtvrtek, 24. března 2011

Compare traditional approachvs.

ObjectForms developmentčtvrtek, 24. března 2011

Traditional development approach

Development with ObjectForms

ObjectForms Demo App

market://details?id=objectforms.android

Cross platform (GWT)

Don’t be afraid !

Thank you.

Questions & answers

@perpetumdesign

#objectforms

pavel@perpetumdesign.com

CreditsSome of the images are from Flickr using Creative Commons License, all credit goes to their authors.

Entire presentation can be freely distributed under Creative Commons license as well.Chevron definition taken from Dictionary application by Apple, Inc.

ObjectForms is property of PerpetumDesign.Original idea of Java Bean introspection and UI generation came from BeanView by Will Iverson of CTG

Current GWT version uses wonderful reflection package Gwittir from Robert “kebernet” CooperAll other products and trademarks are property of their respective owners.

No chevrons were destroyed during preparing this presentation.

Droidcon 2011: Effective android programming with object forms

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