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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>React Native Android</title>
<meta name="description" content="A framework for easily creating beautiful presentations using HTML">
<meta name="author" content="Hakim El Hattab">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/black.css" id="theme">
<!-- Code syntax highlighting -->
<link rel="stylesheet" href="lib/css/zenburn.css">
<!-- Printing and PDF exports -->
<script>
var link = document.createElement( 'link' );
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = window.location.search.match( /print-pdf/gi ) ? 'css/print/pdf.css' : 'css/print/paper.css';
document.getElementsByTagName( 'head' )[0].appendChild( link );
</script>
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section>
<h1>React Native Android</h1>
<h2>An Intro!</h2>
<h4>Software Engineering Club</h4>
<h4>Rm 6-12. Jan 20. 11am</h4>
<img src="img/react.png" height="100" width="100" style="border: 0; background: 0"/>
<img src="img/android-logo.png" width="100" height="100" style="border: 0; background: 0"/>
<p>
<small>Christine Yu / <a href="http://github.com/cy">http://github.com/cy</a></small>
</p>
</section>
<section data-markdown>
What
=======
- framework to build Native mobile apps using JS and React
- used by fb for Groups and Ads manager apps
- iOS: Jan 2015, Android: Sept 2015
</section>
<section data-markdown>
Why Not __
=========
- Native SDKs
- learning curve: seperate paradigms
- maintaince: seperate codebases
- compiling takes a long time
</section>
<section>
<ul>
<li>Cordova/PhoneGap</li>
<ul>
<li>wrapped webview feels toyish</li>
<li>slow performance</li>
</ul>
<li>NativeScript</li>
<ul>
<li>no react! imperative</li>
</ul>
<li>Crosscompiled Xamarin (C#), Marmalade (C++)</li>
<ul>
<li>can't use native SDK elements</li>
<li>doesn't look native on any platform</li>
<li>lots of control, very manual</li>
</ul>
</ul>
<aside class="notes">
- using a compiler to compile code down to binaries that will run on a different platform.
- Marmalade use GCC ARM to compile for Android, GCC x86 to compile for simulator (has own simulator)
</aside>
</section>
<section data-markdown>
Why React Native?
========
- "learn once, write everywhere"
- JS (ships with mix of es6 and es7 Babel transforms)
- https://facebook.github.io/react-native/docs/javascript-environment.html
- can use any editor (not boxed into XCode/Eclipse/Android Studio)
- turly native
</section>
<section data-markdown>
React Basics
===========
- Declarative approach
- everything is a component (vs controllers, directives, services in Angular 1)
- component communication via props
- solves the problem of stateful ui by rerendering UI whenever the state or props changes
- calculates a diff
```javascript
render() {
return(
<View>
<Text>Hello World!</Text>
</View>
);
}
```
</section>
<section data-markdown>
React Native Basics
==================
- JSX wraps native elemts:
- View, ListView
- Text
- TouchableOpacity, TouchableHighLight
- Navigator
- Subset of CSS properties to style
- Flexbox for layout
</section>
<section data-markdown>
##How does Native work?
Under the Hood of React Native talk, https://www.youtube.com/watch?v=8N4f4h6SThc)
- JS running in JavaScriptCore JSVM controlling Native through a C++/Java bridge
</section>
<section data-markdown>
- platform specific code are 'infixed' by platform name
- packager starts a local webserver and sends a JS bundle to device
```
<Text /> => new TextView(getContext());
```
- Can define your own & publish: https://react.parts/native
Note:
- gradle to assemble release apk
- Native asks to start the app, and starts JSVM
- JSVM runs developer's JS code, ie. give me some views
- goes back to Native, Native goes here are some views
- solves potential bottlenecks by running three threads, UI Event Queue, Native Modules Event Queue and JS Event Queue
</section>
<section data-markdown>
</section>
<section>
<h3>dev Setup</h3>
<img src="./img/AndroidSDK2.png">
</section>
<section data-markdown>
##running for dev
```
$ react-native init # generates hello world proj
$ react-native start # starts local webserver
$ adb reverse tcp:8081 tcp:8081 # enables device GET of js bundle from local webserver
$ react-native run-android # starts the app on device
```
##packaging apk
```
$./gradlew assembleRelease
```
</section>
<section data-markdown>
tools
===========
- android monitor
- android avd emulator (slow even with accelerator, test on device)
- live reloading or shake to reload
- chrome debugger
- element inspector
</section>
<section data-markdown>
cons
=======
- Navigator awkward to use
- pass props in the route?
- switch statement in render?
- Reload always restarts at the first scene
- trick: set the intial scene to the one you're working on
- Still new
- few modules (no offical camera, accelerometer apis)
</section>
<section>
- unexpected, not to spec errors:<br />
<pre><code data-trim data-noescape>
<View style={{borderWidth: 1, ...style}}>
</code></pre>
<img src="./img/GA2OS.png" height="400">
<pre><code data-trim data-noescape>
<View style={[{paddingLeft:1}, ...style]}>
</code></pre>
</section>
<section data-markdown>
## extras
- app I wrote before this talk
- https://github.com/cy/kanaspeed
- boiler plate app w/ redux
- https://github.com/FormidableLabs/formidable-react-native-app-boilerplate
- react native playground
- https://rnplay.org/
- these slides
- https://github.com/cy/react-native-talk
</section>
</div>
</div>
<script src="lib/js/head.min.js"></script>
<script src="js/reveal.js"></script>
<script>
// Full list of configuration options available at:
// https://github.com/hakimel/reveal.js#configuration
Reveal.initialize({
controls: true,
progress: true,
history: true,
center: true,
transition: 'slide', // none/fade/slide/convex/concave/zoom
// Optional reveal.js plugins
dependencies: [
{ src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } },
{ src: 'plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: 'plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: 'plugin/highlight/highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } },
{ src: 'plugin/zoom-js/zoom.js', async: true },
{ src: 'plugin/notes/notes.js', async: true }
]
});
</script>
</body>
</html>