How To: Build Android and iOS app in Java

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How To: Develop an app for Android and iOS in Java Alexey Buzdin, September 2015

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@AlexeyBuzdin Developer / Trainer at C.T.Co

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Angry Birds

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Inbox

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Spotify

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Twitter

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go X-platform? Go Native or

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New product checklist - Release date - Platform count - Platform priorities - App future __________ __________ __________ __________ ? ? ? ?

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- Release date - Platform count - Platform priorities - App future __________ __________ __________ __________ 1 New product checklist

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- Release date - Platform count - Platform priorities - App future Native __________ __________ __________ __________ 1 New product checklist

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- Release date - Platform count - Platform priorities - App future __________ __________ __________ __________ All Fast All at once ? New product checklist

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- Release date - Platform count - Platform priorities - App future __________ __________ __________ __________ All Fast Cordova / PhoneGap All at once New product checklist Short Lasting

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Cordova / PhoneGap

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- Performance problems - Non native UI - Easy to add Platforms - One codebase - Native interop Cordova / PhoneGap Consequences

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- Release date - Platform count - Platform priorities - App future __________ __________ __________ __________ All Fast All at once Short Lasting New product checklist

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- Release date - Platform count - Platform priorities - App future __________ __________ __________ __________ All Fast Xamarin Forms / CodenameOne All at once Short Lasting New product checklist

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Xamarin Forms / CodenameOne

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- Performance like native - Native UI - Hard to modify gen code - Native interop - One codebase Xamarin Forms / CodenameOne Consequences

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- Release date - Platform count - Platform priorities - App future __________ __________ __________ __________ All Long One by One Long living New product checklist

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- Release date - Platform count - Platform priorities - App future __________ __________ __________ __________ All Long Xamarin / RoboVM / Tengu One by One Long living New product checklist

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Xamarin / RoboVM / Tengu

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- Performance like native - Native UI - Native library binding - Shared common core - Separate UI modules per platform Xamarin / RoboVM / Tengu Consequences

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http://java.dzone.com/articles/state-native-vs-web-vs-hybrid Great article

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Xamarin / RoboVM / Tengu

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Core UI UI With one language

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Core UI UI With one language 30-50% 50-70%

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C# Java iOS Xamarin / RoboVM / Tengu

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what are we sharing?

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MVVM ViewModel Model View

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View - User Interface Model - Logic and Data ViewModel - binds UI properties with internals - communicate with commands

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MVVM ViewModel Model View

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MVVM View Model ViewModel shared

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Activity ViewController ViewModel Service DAO

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Activity ViewController onLongClick(coord) ViewModel putPoint()

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Activity ViewController onLongClick(coord) ViewModel putPoint() DAO savePoint()

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Activity ViewController search(input) ViewModel search(input)

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Activity ViewController search(input) ViewModel search(input) Service internalSearch(input)

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Activity ViewController search(input) ViewModel search(input) Service internalSearch(input) sends ShowLocationEvent

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RoboVM 1.8.0 Released yesterday http://www.robovm.org/

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-Java bytecode to native -familiar infrastructure gradle, maven, Idea, eclipse java library reuse -ios lib binding; Robopods -Debugger

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-uses android-rt library -no code generation -has reflection support -xcode ui bindings jackson or gson should work

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Core UI UI With Java

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-Library reuse Together -Build scripts reuse -Model / persistance reuse -Java 8 with retrolambda

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More sharing?

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Activity ViewController onClick() ViewModel DAO savePoint(coord) saveCurrentLocation()

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Activity ViewController onClick() ViewModel DAO savePoint(coord) ? saveCurrentLocation()

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Activity ViewController onClick() ViewModel saveCurrentLocation() DAO savePoint(coord) ? Service getCoord()

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Service IGPSService Android Impl iOS Impl shared client- specific

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How to provide igpsservice?

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- dao = new dao()

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- gps = new iOSGPSservice() - dao = new dao()

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- vm = new ViewModel(gps, dao) - gps = new iOSGPSservice() - dao = new dao()

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- new Activity(vm) - vm = new ViewModel(gps, dao) - gps = new iOSGPSservice() - dao = new dao()

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Dependency injection

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which di?

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which di? guice or weld!

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which di? guice or weld! code generation sorry

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ever heard of Dagger? http://square.github.io/dagger/

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COMPILE-TIME CODE GENERATION!* Dagger features *partially

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COMPILE-TIME CODE GENERATION!* Dagger features *partially sorry won’t work on and

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ever heard of Dagger 2.0? http://google.github.io/dagger/

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COMPILE-TIME CODE GENERATION! Dagger 2.0 features will work on and

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https://github.com/LArchaon/robovm-dagger2-sample

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Summary -no silver bullet -java xamarin is here! -think of reuse in advance -involve in Robovm design