Groovy on Android (as of 2016)
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This document discusses using Groovy on Android apps. Groovy is a JVM language that offers simplicity compared to Java and interoperability. To use Groovy in an Android project, the Groovy and Grooid dependencies are added along with plugins. Groovy classes can then be created alongside Java sources. Benefits include collections APIs, AST transformations for domain objects, and libraries like Fluent and SwissKnife. Potential downsides are issues with Android Studio integration and large APK sizes.
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Groovy on Android (as of 2016)
- 1. Groovy on Android (as of 2016)
- 2. About Me Kevin H.A. Tan Solutions Evangelist Polyglot Software Dev AWPL.co
- 3. My Tech Stacks • Android, Spring Boot, AngularJS, Java in general, Groovy related frameworks like Gaelyk and Grails, etc.
- 4. About Android • mobile operating system based on Dalvik and ART, coded in Java
- 5. About Groovy • JVM programming language that has been existent since 2004
- 6. About Groovy
- 7. Why Groovy? • Simplicity compared to Java Syntax • Reactive (sorta) • Interoperability with Java code
- 8. Differences between yesteryear and 2016 • groovy-all and grooid
- 9. Usage buildscript{ repositories { jcenter() } dependencies { classpath ‘com.android.tools.build:gradle:1.5.0’ classpath ‘org.codehaus.groovy:gradle-groovy-android-plugin: 0.3.8’ } } apply plugin: ‘groovyx.grooid.groovy-android’
- 11. Lazybones • Project bootstrap http://mariogarcia.github.io/grooid-templates/ lazybones create grooid-new-project newandroidproject
- 12. Lazybones
- 13. Project Structure • src/main/groovy • src/test/groovy • src/androidTest/groovy
- 14. Source sets androidGroovy { sourceSets { main { groovy { srcDirs += ‘src/main/java’ } } } }
- 15. Compilation Options androidGroovy { options { configure(groovyOptions) { encoding = 'UTF-8' forkOptions.jvmArgs = ['-noverify'] // maybe necessary if you use Google Play Services } sourceCompatibility = '1.7' // as of 0.3.9 these are automatically set based off the android plugin's targetCompatibility = '1.7' } }
- 16. Domain Classes • Groovy AST Transformation (AST means Abstract Syntax Tree, which is basically an abstract representation of code / any syntactic structure. A transformation is an action modifying this tree) @AutoExternalize @ToString @Immutable @InheritConstructors
- 17. Domain Classes
- 18. Collections userList.findAll { User user -> user.isCompanyTeam }.sort { User user -> user.fullName }
- 19. Prevent NPE • ? operator • * operator responseList?.add(…)
- 20. Sample Activity
- 21. Libraries • Fluent API • JsonSlurper and XMLSlurper • Groovy AST Transformation • SwissKnife (similar with Butterknife by Jake Wharton) More info: http://groovy-almanac.org/ and http://melix.github.io/blog/2014/06/grooid.html
- 22. SwissKnife https://github.com/Arasthel/SwissKnife DSLs for example: @OnUiThread void doSomething(){ }
- 24. Downsides • Doesn’t fully work with Android Studio in terms of Goto File implementation (workaround - double tap Shift to search and go to file) • Right click on package, select New > Create Groovy Class doesn’t appear. • Packaged APK file is huge (due to the hug grooid jar size)
- 25. Other than that… • Almost everything works… almost
- 26. DEMO
- 27. References Introduction to Groovy • http://www.slideshare.net/L0rDKadaj/ introduction-to-groovy-39150312