Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Briefly Introduction of Kotlin coroutines
Search
Elvis Lin
October 19, 2018
Programming
1
280
Briefly Introduction of Kotlin coroutines
Introduce basic concepts of Kotlin coroutines
Elvis Lin
October 19, 2018
Tweet
Share
More Decks by Elvis Lin
See All by Elvis Lin
Protect Users' Privacy in iOS 14
elvismetaphor
0
49
Dubugging Tips and Tricks for iOS development
elvismetaphor
0
50
Strategies of Facebook LightSpeed project
elvismetaphor
0
80
Background Execution And WorkManager
elvismetaphor
2
480
作為一個跨平台的 Mobile App 開發者,從入門到放棄!?
elvismetaphor
2
510
Dependency Injection for testability of iOS app
elvismetaphor
1
1.4k
MotionLayout Brief Introduction
elvismetaphor
1
330
Chapter 10. Pattern Matching with Regular Expressions
elvismetaphor
0
47
Machine Learning Application on Mobile Devices
elvismetaphor
0
100
Other Decks in Programming
See All in Programming
Claude Code派?Gemini CLI派? みんなで比較LT会!_20250716
junholee
1
700
「App Intent」よくわからんけどすごい!
rinngo0302
1
130
Gemini CLI のはじめ方
ttnyt8701
1
100
Vibe Codingの幻想を超えて-生成AIを現場で使えるようにするまでの泥臭い話.ai
fumiyakume
18
9.2k
レトロゲームから学ぶ通信技術の歴史
kimkim0106
0
130
テストから始めるAgentic Coding 〜Claude Codeと共に行うTDD〜 / Agentic Coding starts with testing
rkaga
16
6k
「テストは愚直&&網羅的に書くほどよい」という誤解 / Test Smarter, Not Harder
munetoshi
1
220
Startups on Rails in Past, Present and Future–Irina Nazarova, RailsConf 2025
irinanazarova
0
300
Workers を定期実行する方法は一つじゃない
rokuosan
0
130
フロントエンドのパフォーマンスチューニング
koukimiura
6
2.3k
Rails Frontend Evolution: It Was a Setup All Along
skryukov
0
330
Quality Gates in the Age of Agentic Coding
helmedeiros
PRO
1
100
Featured
See All Featured
Agile that works and the tools we love
rasmusluckow
329
21k
Documentation Writing (for coders)
carmenintech
72
4.9k
How GitHub (no longer) Works
holman
314
140k
Build your cross-platform service in a week with App Engine
jlugia
231
18k
Become a Pro
speakerdeck
PRO
29
5.4k
GraphQLとの向き合い方2022年版
quramy
49
14k
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
18
1k
RailsConf 2023
tenderlove
30
1.2k
What's in a price? How to price your products and services
michaelherold
246
12k
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
44
2.4k
Producing Creativity
orderedlist
PRO
346
40k
Intergalactic Javascript Robots from Outer Space
tanoku
271
27k
Transcript
Kotlin Coroutines, 從入⾨門到入⾨門 Elvis Lin(@elvismetaphor) Taiwan 2018 #JCConf
關於我 • Elvis Lin • Android, iOS 與 React Native
永遠的初學者 • Twitter: @elvismetaphor • Blog: https://blog.elvismetaphor.me #JCConf Taiwan 2018
⼤大綱 • 循序處理理 • 並⾏行行處理理與Multi-thread • Why Coroutines? • 基本的使⽤用⽅方式
#JCConf Taiwan 2018
循序處理理 #JCConf Taiwan 2018 Main
循序處理理的程式 fun main(args: Array<String>) { println("First") println("Second") println(“Third") } #JCConf
Taiwan 2018
循序處理理的程式與Thread fun main(args: Array<String>) { println("First") printDelayed(“Second") println("Third") } fun
printDelayed(message: String) { Thread.sleep(1000) println(message) } #JCConf Taiwan 2018
循序處理理的程式與 Coroutines fun main(args: Array<String>) { println(“First") runBlocking { printDelay("Second")
} println("Third") } suspend fun printDelay(message: String) { delay(1000) println(message) } #JCConf Taiwan 2018
循序處理理的程式 與 Coroutines(簡易易版) fun main(args: Array<String>) { println(“First") runBlocking {
delay(1000) println(“Second”) } println("Third") } #JCConf Taiwan 2018
並⾏行行處理理 (Multi-thread) #JCConf Taiwan 2018 Main Other
並⾏行行處理理的程式與 Thread fun main(args: Array<String>) { println("First") printNonBlocking("Second") println("Third") }
fun printNonBlocking(message: String) { Thread { Thread.sleep(1000) println(message) }.start() } // Output: First Third Second
並⾏行行處理理的程式與 coroutines fun main(args: Array<String>) { println("First") launch { printDelay("Second")
} println("Three") } suspend fun printDelay(message: String) { delay(1000) println(message) } // Output: First Third Second #JCConf Taiwan 2018
Why Coroutines #JCConf Taiwan 2018
Coroutines • Coroutines are like very light-weight thread • Coroutines
computations can be done without blocking other threads. • Coroutine 的執⾏行行可以更更有效地利利⽤用原本已經建立在 ThreadPool 裡⾯面的 Threads #JCConf Taiwan 2018
常⽤用的關鍵字 • suspend • delay • launch • runBlocking •
await • async #JCConf Taiwan 2018
suspend • ⼀一個 modifier • ⼀一個 suspend 的 function 只可以被
suspend function 或另⼀一 個 coroutine 呼叫 #JCConf Taiwan 2018
launch • 執⾏行行⼀一個 async 的 job #JCConf Taiwan 2018 launch
{ anSimpleFunction() }
runBlocking • 執⾏行行⼀一個 sync 的 job #JCConf Taiwan 2018 runBlocking
{ anSimpleFunction() }
async & await • aysnc {…} 會回傳⼀一個 Deferred<T> • 在回傳的
deferred 上⾯面加上 await 會獲得值 #JCConf Taiwan 2018 val value = async {calculate(1)}.await()
Live Demo https://gist.github.com/elvismetaphor/ 810712e3a08863c963c871f1bca0b3f2 #JCConf Taiwan 2018
Coroutines v.s. RxJava • Coroutines: 更更輕量量,更更容易易將原本循序式的程式改成非同 步、並⾏行行處理理的⽅方式 • RxJava: 提供更更豐富的
operators 做 stream 的轉換 • 根據你的使⽤用情境挑選適合的 library #JCConf Taiwan 2018
總結 • Coroutine 提供⼀一個類似 Thread 的功能,但是更更輕量量的操 作 • Coroutine 讓你可以容易易的將原本同步操作的邏輯轉換成非
同步操作的邏輯 #JCConf Taiwan 2018
參參考資料 • https://kotlinlang.org/docs/reference/coroutines- overview.html • Introduction to coroutines: https://youtu.be/_hfBv0a09Jc •
Exploring coroutines in Kotlin: https://youtu.be/ jT2gHPQ4Z1Q #JCConf Taiwan 2018
Thank you :) #JCConf Taiwan 2018