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Empowering Java Developers: Create iOS Apps with RoboVM

Discover RoboVM, the open-source project that enables Java and other JVM languages like Scala, Groovy, and Clojure to build native iOS applications. Launched in January 2013, RoboVM converts Java bytecode into machine code, offering fast performance without the need for an interpreter or JIT. It provides bindings for iOS APIs and access to device hardware, making it a solid choice for cross-platform development. With over 100 apps in the App Store and thousands of users, RoboVM ensures an enriching experience for developers seeking to extend Java's reach onto iOS.

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Empowering Java Developers: Create iOS Apps with RoboVM

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  1. Java on ios?yesyoucan! Niklas Therning / @ntherning Henric Müller / @henricmuller Trillian Mobile AB robovm.com

  2. The RoboVM Project • Goal: Java on iOS • andother JVM languages: Scala,Groovy,Clojure, … • Open-sourcesinceJan 2013 • github.com/robovm • License allows closed source apps • www.robovm.com / @robovm

  3. RoboVM Features • Java bytecodetomachinecode • AheadOfTime, no interpreter, no JIT • Fastapps • Runtimeclassesbased on Android • java.*, javax.*, etcincl. I/O, reflection • Supports 3rd party JAR files • Supports standard JNI(static)

  4. RoboVM Features • Bindings for nativeiOS APIs • Full access to hardware, services, UI, etc

  5. RoboVM Features • Integrateswithpopular Java tools • sbt • Leiningen

  6. RoboVM is … … not an AndroidtoiOSappconverter … not a Java toObj-C source translator … not only for games* * (Though it worksgreat for games too!)

  7. Current Status • 100+ apps in App Store • Thousandsofusers • 1.0 scheduled for late 2014

  8. 1.0 Alpha 2 just released! λ Introduces lambdas and default methods

  9. Showcase: ContractRPunch clock for contractors

  10. Cross-platformappdevelopment Option #1 – Native UI

  11. Cross-platformappdevelopmentOption #1 – Native UI • Pros • UserExperience • Performance • Cons • Less codereuse • Learning curve – API/tooldifferences

  12. Cross-platformappdevelopmentOption #1 – Native UI Usepatternstomaximizecodereuse MVC MVVM Controller Controller Viewmodel Viewmodel View View Model Model View View Model Model

  13. 3 separatemodules Core (model) Android iOS

  14. Common modelcode: publicclassClientModel{ publicClientcreate() { … } publicintcount() { … } publicClient get(intindex) { … } …

  15. UITableViewCellgetRowCell(UITableViewtableView, NSIndexPathindexPath) { UITableViewCellcell = tableView.dequeueReusableCell("cell"); if(cell == null) { cell= newUITableViewCell(UITableViewCellStyle.Value1, "cell"); cell.setAccessoryType(UITableViewCellAccessoryType.DisclosureIndicator); } Clientclient = clientModel.get((int) indexPath.getRow()); cell.getTextLabel().setText(client.getName()); returncell; } iOSspecific UI code:

  16. publicViewgetView(int position, ViewconvertView, ViewGroupparent) { Viewview= convertView; if (convertView== null) { view= inflater.inflate(android.R.layout.simple_list_item_1, parent, false); } Clientclient = clientModel.get(position); TextViewtext= (TextView) view.findViewById(android.R.id.text1); text.setText(client.getName()); returnview; } Androidspecific UI code:

  17. Cross-platformappdevelopmentOption #1 – Native UI DEMO #1

  18. Cross-platformappdevelopment Option #2 – Cross Platform UI JavaFX from the OpenJFXproject

  19. Cross-platformappdevelopmentOption #2 – Cross Platform UI • Pros • Close to 100% codereuse • Cons • UserExperience • Performance

  20. Cross-platformappdevelopmentOption #2 – Cross Platform UI DEMO #2

  21. ContractR and othersamplescan be found at github.com/robovm/robovm-samples

  22. Commercial Licenses • Launch late 2014 • Standard Java debugger support • Support options Open source version still letsyoudevelopamazingapps for freewithout limitations!

  23. ? Check outwww.robovm.com and follow @robovm

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