Groovy on Android
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Presentation during Codemotion 2014 about using Groovy for Android development.
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Groovy on Android
- 1. 1 Android and Groovy
- 2. 2 Mario Garcia Software Engineer Happily Working for @marioggar
- 3. 3 Let me tell you a story...
- 4. 4 Long Long time ago.... There was a back-end developer ...
- 5. 5 Long Long time ago.... He used to code using Groovy
- 6. 6 Long Long time ago.... But not all was happiness... At the beginning Groovy couldn't Work on Android
- 7. 7 But finally that day came.... During the GR8Conf...
- 8. 8 Cedric Champeau core developer Yes now you can!!! Released Groovy 2.4 :grooid Thanks Cedric!!!!
- 9. 9
- 10. 10 He took his mobile and.... Every seemed to be awesome but then ...
- 11. 11 Light became darkness because....
- 12. 12 Darkest hour No background on Android development Activity Fragment Layouts Adapters UIThread Bla bla... Bla bla... Bla bla...
- 13. 13 Darkest hour Almost no docs about Groovy on Android Cedric Champeau Blog http://melix.github.io/blog/ Github https://github.com/melix
- 14. 14 Create the first project.... Tools, tools everywhere ...
- 15. 15 Two paths %
- 16. 16 The Gradle Path Grab some of Cedric's projects Add what you need and build it Import to AS
- 17. 17 Gradle Hey is Groovy!! Less verbose than Maven Is code not XML Polyglot Same build tool for different languages At some point it should set you free from any IDE
- 19. 19 Gradle Android SDKs version
- 21. 21 Android Studio Import your Gradle app
- 22. 22 Android Studio Project structure
- 23. 23 Java Path (Android Studio) Ask AS to create a Java project Add Cedric plugin Keep working
- 24. 24 Android Studio Or create a new Android/Gradle project
- 25. 25 He swore he would never... How can avoid repeating the whole process again ?
- 26. 26 Wish list Basic working Groovy skeleton Basic helpful dependencies to make my life less miserable Add Asciidoctor :) Add whatever you want...
- 27. 27 Lazybones What's lazybones A simple project creation tool that uses packaged project templates. Created by: Peter Leedbrook https://github.com/pledbrook/lazybones
- 28. 28 Lazybones With lazy bones he could: Basic working Groovy skeleton... DONE Basic dependencies to make my life less miserable... Add Asciidoctor... Add whatever you want... DONE DONE
- 29. 29 SHOW ME THE CODE How Groovy can help you ?
- 30. 30 Groovy by default At the beginning everything looked like Java:
- 31. 31 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
- 32. 32 Groovy by default Bean construction: Using map constructor:
- 33. 33 Groovy collections and more... Collections were more fun Filtering and mapping (find/collect)
- 34. 34 Closures Turn functional interfaces to functions (I): Whenever you have to implement an interface with just one method you can use a closure
- 35. 35 Closures Turn functional interfaces to functions (II): Whenever you have to implement an interface with just one method you can use a closure
- 36. 36 Closures - Fn Currying and MethodClosure: Plain Java methods can become high order functions
- 37. 37 Closures Functional Interface coertion:
- 38. 38 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
- 39. 39 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
- 40. 40 SwissKnife A multi-purpose Groovy library containing view injection and threading for Android using annotations. It's based on both ButterKnife and AndroidAnnotations
- 41. 41 SwissKnife Injecting Views. Forget about findViewById
- 42. 42 SwissKnife @OnBackground and @UIThread @OnBackground Creates an async task @UIThread It gets a handler instance to run the body in the UI thread
- 43. 43 SwissKnife @OnBackground and @UIThread
- 44. 44 SwissKnife @OnClick, @OnItemSelected... There are several other annotations for annotating methods you want to be triggered when an event occurs
- 45. 45 Grooid-tools A DSL for generating views with Groovy https://github.com/karfunkel/grooid-tools For example create a TextView s
- 46. 46 What about performance ? Faster, cleaner, cheaper...
- 47. 47 Performance Before blaming the language you may want to check if the problem is elsewhere ;)
- 48. 48 Performance @CompileStatic: It optimizes bytecode applying static check compilation Sorry, I don't have benchmarks on Android In the JDK we're doing well with InvokeDynamic On Android is advisable to use it...what please don't freak out !
- 50. 50 What's next ? The future
- 51. 51 Android Wear Stay tuned at http://melix.github.io/blog/
- 52. 52 Who knows ? Groovy Groovy everywhere
- 53. 53 Thank you … Q & A