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
290
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
52
Dubugging Tips and Tricks for iOS development
elvismetaphor
0
52
Strategies of Facebook LightSpeed project
elvismetaphor
0
85
Background Execution And WorkManager
elvismetaphor
2
490
作為一個跨平台的 Mobile App 開發者,從入門到放棄!?
elvismetaphor
2
520
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
48
Machine Learning Application on Mobile Devices
elvismetaphor
0
110
Other Decks in Programming
See All in Programming
なぜGoのジェネリクスはこの形なのか? Featherweight Goが明かす設計の核心
ryotaros
7
1k
Le côté obscur des IA génératives
pascallemerrer
0
120
NetworkXとGNNで学ぶグラフデータ分析入門〜複雑な関係性を解き明かすPythonの力〜
mhrtech
3
1k
Back to the Future: Let me tell you about the ACP protocol
terhechte
0
130
Pull-Requestの内容を1クリックで動作確認可能にするワークフロー
natmark
2
460
デミカツ切り抜きで面倒くさいことはPythonにやらせよう
aokswork3
0
190
2分台で1500examples完走!爆速CIを支える環境構築術 - Kaigi on Rails 2025
falcon8823
3
3.3k
Go Conference 2025: Goで体感するMultipath TCP ― Go 1.24 時代の MPTCP Listener を理解する
takehaya
7
1.6k
実践AIチャットボットUI実装入門
syumai
7
2.5k
SpecKitでどこまでできる? コストはどれくらい?
leveragestech
0
540
止められない医療アプリ、そっと Swift 6 へ
medley
1
120
2025年版 サーバーレス Web アプリケーションの作り方
hayatow
23
25k
Featured
See All Featured
The Illustrated Children's Guide to Kubernetes
chrisshort
48
51k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
49
3.1k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
32
2.2k
4 Signs Your Business is Dying
shpigford
185
22k
Measuring & Analyzing Core Web Vitals
bluesmoon
9
610
A designer walks into a library…
pauljervisheath
209
24k
Dealing with People You Can't Stand - Big Design 2015
cassininazir
367
27k
Fireside Chat
paigeccino
40
3.7k
BBQ
matthewcrist
89
9.8k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
667
120k
Side Projects
sachag
455
43k
Building Applications with DynamoDB
mza
96
6.6k
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