An Open Source Advantage (Droidcon MTL 2015)

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an open source advantage @jakewharton @jessewilson

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Marketing

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Reputation

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Documentation

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Share Code

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Who do you work with?

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SOFTWARE DEVELOPER

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CUSTOMER PRODUCT EDITOR DESIGNER SOFTWARE DEVELOPER

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So you’re making a blue ribbon Android application Best PROGRAMMER’S RELEASE

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You’re going to need many libraries.

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• views: lists, sticky headers, layout binding • networking: HTTP client, image downloaders, REST adapter • data: JSON, protocol buffers, database access, value objects • monitoring: analytics, automatic & manual bug reporting, logging • development: debug utilities, static analysis • testing: UI, unit testing, mock objects, assertions, JVM testing • structure: dependency injection, async events, navigation

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{  "baseUrl": "http://localhost:8080/cash/",  "headerBackgroundUri": "/static/email/images/exampleBackground.png",  "headerImageUri": "animatedHeader.gif",  "theme": {  "backgroundColor": "#ce0606",  "textColor": "#ff6a5f",  "buttonColor": "#ec2a2a"  },  "headerAlt": "$35",  "title": "I embedded the background image in the HTML.",  "button": {  "label": "Thanks",  "url": "https://cash.me/"  },  "showAboutFooter": false,  "rightToRefundLink": false  }

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Each library has many features.

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JSON library

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JSON library JSON writer JSON reader binding annotations m odel objects precision policy lenient policy binding system collections binding POJO bindings date bindings hash collision defence constructor caller code generator exception policy pretty printer benchmarks U TF-8 transcoder type registry naming policy string pool error locator type resolver enum bindings cycle defense

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Each feature requires many lines of code.

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/**  * Returns a JsonPath to  * the current location in the JSON value.  */  public String getPath() {  StringBuilder result = new StringBuilder().append('$');  for (int i = 0, size = stackSize; i < size; i++) {  switch (stack[i]) {  case JsonScope.EMPTY_ARRAY:  case JsonScope.NONEMPTY_ARRAY:  result.append('[').append(pathIndices[i]).append(']');  break;    case JsonScope.EMPTY_OBJECT:  case JsonScope.DANGLING_NAME:  case JsonScope.NONEMPTY_OBJECT:  result.append('.');  if (pathNames[i] != null) {  result.append(pathNames[i]);  }  break;    case JsonScope.NONEMPTY_DOCUMENT:  case JsonScope.EMPTY_DOCUMENT:  case JsonScope.CLOSED:  break;  }  }  return result.toString();  }

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Can’t build it all yourself! * Unless you’re in no hurry to ship.

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Open source offers many options!

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Guide to Jake & Jesse’s Evaluating Open! Source Projects Picasso, Volley,! Glide, & Fresco: Which one should! you avoid? Jason Parser With forward by Lynn E. R. Layout

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Simple

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Right features

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Correct

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Engaged

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read the code

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} dependencies {

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You just got thousands of lines of code for free. } compile 'com.google.code.gson:gson:2.3.1' dependencies { compile 'com.google.code.gson:gson:2.3.1'

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Put it to work.

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This is the best time to contribute documentation.

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Found a bug? Isolate it.

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Happy? Spread the love.

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You aren’t paying with money.

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You aren’t paying with money. Pay with your time.

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Let’s talk about contributing code…

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SMALL LIBRARY

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YOUR NEEDS SMALL LIBRARY

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JEN’S NEEDS YOUR NEEDS SMALL LIBRARY

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MARCOS’ NEEDS JEN’S NEEDS YOUR NEEDS SMALL LIBRARY

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MARCOS’ NEEDS MATT’S NEEDS JEN’S NEEDS YOUR NEEDS SMALL LIBRARY

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M ARCO S’ N EED S M ATT’S N EED S JEN ’S N EED S YO U R N EED S BIG LIBRARY

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FEATURES YOU DON’T NEED FEATURES YOU NEED

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INCLUDE Code we all need.

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INCLUDE Code we all need. EXCLUDE Everything else!

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I wrote some new features for you!

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No thanks! I wrote some new features for you!

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No thanks! BUT THE CODE IS ALREADY WRITTEN!

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BUT THE CODE IS ALREADY WRITTEN! Ummm…

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EXTENSIBLE! Good APIs are EXTENSIBLE!

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OUR API MAKES YOUR CODE SIMPLE!

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OUR API MAKES YOUR CODE SIMPLE! AMAZE.

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AMAZE. PLUS WE’LL ADD IT AS A SAMPLE!

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(Designing extensible APIs is hard.)

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What to open source?

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Not another JSON library

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Not another JSON library * Unless you’re doing something new.

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Not another JSON library * Unless you’re doing something new.

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Often it’s code you inherited!

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Managing a Codebase

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Managing a Community

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Be inclusive.

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Prefer face to face.

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ﬂic.kr/jeremylevinedesign ﬂic.kr/koreanet

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• Be responsive. • Engage with people. • Say no (nicely). • Cut releases. Responsibilities

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• Guide the ship. • Programming is fun. • Make friends! • Reputation.  (which you can exchange for speaking opportunities at Droidcons) Perks

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Enjoy Droidcon Montréal @jakewharton @jessewilson