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Exploring the possibilities of Unidirectional Data Flow Architectures on Android Brian Egan & Guillaume Lung November 10, 2015

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Danger: Fun & Experimental! We don’t actually use any of this on the SoundCloud Android App.

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What’s happening? UI Playback User Interaction ZOMG

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Visualize the state change! State UI State UI State UI State UI

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Demo Redux, Brian!

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DX

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The Basics

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State UI Unidirectional Flow Actions / Intent f( )

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Global State State Immutable Data Structures

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A simple counter app. One example to try them all.

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Plan 1. State with Redux 2. Components with Elm 3. RX with Cycle

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Redux

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Data Flow in Redux model reduce model action , state change notification Subscriber

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State & UI Over time State UI State UI State UI State UI

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Time Travel! State UI State UI State UI State UI

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Time Travel! State UI State UI State UI State UI

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Time Travel! State UI State UI State UI State UI

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Time Travel! State UI State UI State UI State UI

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Testing!

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Elm Architecture

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Elm Architecture update model view

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Elm Architecture update model view UI

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Elm Architecture update model view UI action

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Elm Architecture model update model view UI action ,

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Composable action model update view

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Components action model update view

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Compose interfaces with Components!

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Open / Closed principle

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update model view View Data Structure Views become testable

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Cycle.js

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Cycle driver main

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View View View Cycle driver main Itent Itent Itent

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Complex.

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Render anywhere! State Android State iOS State web State Server

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Now for the Android Demo! A TODO list with redux and debug tools

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Wrapping up

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State UI Unidirectional Flow Actions f( )

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Composable UI Time Travel Debugging Testing Render anywhere Fun to learn :) Benefits

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Bug reports, Databases, Hot Reloading* More possibilities

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Memory Footprint, UI Rendering Speed Unsolved

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Should I start writing my production apps like this?

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NO

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Should we continue to experiment and improve our architectures?

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YES

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Pleasure in development

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Thank you. Brian Egan & Guillaume Lung December 10, 2015

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● This presentation examples. ● Unidirectional use interface architectures by André Staltz ● Facebook flux documentation. ● Presentation of Redux by Dan Abramov at Go Reactive. ● Presentation of Cycle.js by André Staltz at Go Reactive ● ELMLang and the ELM-architecture tutorial ● Redux-Java ● Kotlin ● RxBindings ● The SoundCloud android app. architecture by Matthias Käppler at Goto Resources