Android Apps with Groovy: A Better Way to Code on Android
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- Groovy can be used to create Android apps and provides features like domain classes, closures, and traits that make development more concise and readable compared to Java. - A Groovy Android app can be created using the Lazybones template tool or the Android Studio wizard by adding Groovy dependencies. The app is then built with Gradle. - Groovy provides features out of the box like safe null checking, functional programming with closures, and domain-specific languages that simplify common tasks in Android. Additional libraries allow reactive and testing functionality.
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Android Apps with Groovy: A Better Way to Code on Android
- 1. Android Apps with Groovy
- 2. About me ● Mario Garcia – Software engineer at Kaleidos https://github.com/mariogarcia @marioggar
- 3. Before I begin... ● Thanks to Tuenti ● Disclaimer – I'm not an Android developer – Questions welcomed :)
- 4. What is this talk about ? ● Summary – Android is NOT ONLY Java – Your first Grooid app – Groovy features – Useful libraries – Reactive – Testing – Q & A
- 5. Android is NOT ONLY Java ● Why not Groovy ? – Why not… ? – Chose your poison:
- 7. Create your first Groovy app ● The Android Studio wizard – Meant for Java – If you go this way, then: ● Create a Java app through the wizard ● Add Groovy/Gradle plugin ● Add needed basic dependencies ● …
- 8. Create your first Groovy app ● A better way: – Create a basic skeleton with Lazybones – Import as Gradle project to Android Studio – Profit!
- 9. Create your first Groovy app ● Lazybones – A simple project creation tool – Templates – Really easy to use and extend
- 10. Create your first Groovy app ● Grooid templates – Lazybones templates for creating: ● Android app, Android lib ● Coming soon: Google Glass app
- 11. Create your first Groovy app ● Gradle – Android Reference build tool – Convention over Configuration – Still thinking of Maven ? check this out: ● https://gradle.org/maven_vs_gradle/
- 12. Create your first Groovy app ● Android Studio – Reference IDE based on Intellij IDEA – Really helpful specially for UI – Integrates perfectly with Gradle projects
- 13. Create your first Groovy app ● Demo
- 15. Groovy features ● Domain classes ● Get rid of accessors ● No need to override constructors ● More AST to do pumbling staf – @AutoExternalize – @Canonical – @Immutable – @InheritConstructors – …. many more
- 18. Groovy features ● GDK – Groovy extensions to the JDK ● Groovy collections (collect/inject/find) ● Safe methods to deal with JDK Classes – e.g: take(int) : use it instead of substring
- 19. Groovy features ● NPE and Exceptions – NPE ● ? operator ● * operator ● Elvis :? – Exceptions ● Go functional || Reactive – FNZ: Try<T>, Maybe<T> – RxJava/RxAndroid: onError()
- 20. Groovy features ● Safe operators
- 22. Groovy features ● Closures ● No need to create inner classes anymore ● Wherever there is a Functional Interface you can use a Closure ● Also useful when creating DSLs
- 24. Groovy features ● Closures (cont)
- 26. Groovy features ● Traits – Have you ever wanted to share some functionality between an Activity and a ListActivity ? ● Another way to share functionality among class hierarchies ● Used as if it were an interface ● IDE friendly
- 27. Groovy features Provides waiting spinner Provides easier call to Toast.makeXXX ● Traits
- 29. Advanced features ● Extension Modules – Add new functionality to existing code – Easy to use and program ● Just classes with static methods ● Android Studio recognizes Extension Modules out-of- the-box
- 30. Advanced features Busted! ● Extension modules
- 31. Advanced features ● Custom ASTs – Add new functionality to existing code ● During compilation time ● Extremely powerful ● No need for an annotation-processor ● Harder to code than Extension Modules
- 32. Advanced features ● Show a dialog
- 35. Advanced features ● Swissknife – Makes easier to deal with view injection and threading nightmare. ● Based on AndroidAnnotations and ButterKnife ● Collection of: ASTs, DSLs, Extension Modules
- 37. Reactive Programming ● RxAndroid + Groovy – Less verbose than using Java: ● Closures and Functional Interface coertion ● Composable Closures ● Method Reference
- 38. Code
- 40. Testing ● Spock – A better way of testing ● DSL to describe your tests in a fluent way ● Compatible with JUnit
- 41. Testing ● AndroidSpock – Create integration tests ● Under src/androidTest/groovy ● Helpers to inject and initialize activities in your tests ● Deploys and run tests in the device
- 42. Testing ● Robospock – Create unit tests ● Based on roboelectric 3.0 ● no DEXing or deployment time is wasted to execute your unit tests.
- 43. Other tools ● Quality code – Codenarc ● Static analysis for Groovy ● Highly Configurable ● Completely integrated with Gradle
- 44. References ● Links ● Android Studio – https://developer.android.com/sdk/index.html ● Lazybones – https://github.com/pledbrook/lazybones ● Grooid templates – https://github.com/mariogarcia/grooid-templates ● Swissknife – https://github.com/Arasthel/SwissKnife ● AndroidRx – https://github.com/ReactiveX/RxAndroid
- 45. References ● Links ● Spock – http://spockframework.github.io/spock/docs/1.0/index.html ● Android Spock – https://github.com/pieces029/android-spock ● Robo Spock – http://robospock.org/ ● Gradle – https://gradle.org/ ● Groovy Lang – http://www.groovy-lang.org/
- 46. References ● Links ● Codenarc – http://codenarc.sourceforge.net/ ● FNZ – http://mariogarcia.github.io/fnz/
- 47. Q & A
- 48. Common question ● Size of Groovy :grooid ?
- 49. Thanks!!