1 Android and Groovy
Groovy on Android
Jul 08, 2015
Presentation during Codemotion 2014 about using Groovy for Android development.
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Android and Groovy
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Mario Garcia
Software EngineerHappily Working for @marioggar
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Let me tell you a story...
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Long Long time ago....
There was a back-end developer ...
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Long Long time ago....
He used to code using Groovy
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Long Long time ago....
But not all was happiness...
At the beginning Groovy couldn'tWork on Android
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But finally that day came....
During the GR8Conf...
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Yes now you can!!!Released Groovy 2.4 :grooid
Thanks Cedric!!!!
Cedric Champeau core developer
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He took his mobile and....
Every seemed to be awesome but then ...
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Light became darkness because....
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Darkest hour
No background on Android development
Activity
Fragment
Layouts
Adapters
UIThread
Bla bla...
Bla bla...Bla bla...
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Darkest hour
Almost no docs about Groovy on AndroidCedric Champeau
Blog http://melix.github.io/blog/
Github https://github.com/melix
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Create the first project....
Tools, tools everywhere
...
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Two paths
%
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The Gradle Path
Grab some of Cedric's projects
Add what you need and build it
Import to AS
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Gradle
Hey is Groovy!!Less verbose than MavenIs code not XMLPolyglot
Same build tool for different languages
At some point it should set you free from any IDE
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Gradle
Plugins
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Gradle
Android SDKs version
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Gradle
Dependencies
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Android Studio
Import your Gradle app
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Android Studio
Project structure
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Java Path (Android Studio)
Ask AS to create a Java project
Add Cedric plugin
Keep working
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Android Studio
Or create a new Android/Gradle project
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He swore he would never...
How can avoid repeating the whole process again ?
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Wish list
Basic working Groovy skeletonBasic helpful dependencies to make my life less miserableAdd Asciidoctor :)Add whatever you want...
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Lazybones
What's lazybonesA simple project creation tool that uses packaged project templates.Created by: Peter Leedbrook
https://github.com/pledbrook/lazybones
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Lazybones
With lazy bones he could:Basic working Groovy skeleton...Basic dependencies to make my life less miserable...Add Asciidoctor...Add whatever you want...
DONE
DONE
DONE
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SHOW ME THE CODE
How Groovy can help you ?
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Groovy by default
At the beginning everything looked like Java:
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Groovy by default
But even then if you looked a little bit closer...Some Groovy basic AST transformations saved precious lines
Get rid of accessors
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Groovy by default
Bean construction:Using map constructor:
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Groovy collections and more...
Collections were more funFiltering and mapping (find/collect)
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Closures
Turn functional interfaces to functions (I):Whenever you have to implement an interface with just one method you can use a closure
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Closures
Turn functional interfaces to functions (II):Whenever you have to implement an interface with just one method you can use a closure
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Closures - Fn
Currying and MethodClosure:Plain Java methods can become high order functions
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Closures
Functional Interface coertion:
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Traits
Traits:Sometimes you have to extend different clases but still want to share some common behavior. (Activities/ListActivity)
There are red lines because Android Studio doesn't recognize Traits...yet
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AST Transformations
ASTs:Anytime you fill there is boilerplate code there is work for an AST to do
You can create your own
@ASTTest@AnnotationCollector@AutoClone@AutoExternalize@Canonical@ConditionalInterrupt@EqualsAndHashcode@Field@Immutable@IndexedProperty@InheritConstructors@Memoized
@Sortable@TailRecursive@ThreadInterrupt@Trait@ToString@TupleConstructor@TypeChecked@Log@Log4j
Still a few more
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SwissKnife
A multi-purpose Groovy library containing view injection and threading for Android using annotations. It's based on both ButterKnife and AndroidAnnotations
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SwissKnife
Injecting Views. Forget about findViewById
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SwissKnife
@OnBackground and @UIThread
@OnBackground
Creates an async task
@UIThread
It gets a handler instance to run the body in the UI thread
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SwissKnife
@OnBackground and @UIThread
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SwissKnife
@OnClick, @OnItemSelected...
There are several other annotations for annotating methods you want to be triggered when an event occurs
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Grooid-tools
A DSL for generating views with Groovyhttps://github.com/karfunkel/grooid-tools
For example create a TextView
s
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What about performance ?
Faster, cleaner, cheaper...
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Performance
Before blaming the language you may want to check if the problem is elsewhere ;)
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Performance
@CompileStatic:It optimizes bytecode applying static check compilationSorry, I don't have benchmarks on AndroidIn the JDK we're doing well with InvokeDynamicOn Android is advisable to use it...what please don't freak out !
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Performance
http://open.blogs.nytimes.com/2014/08/?_r=0
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What's next ?
The future
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Who knows ?
Groovy Groovy everywhere
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Thank you …
Q & A
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