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
79
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
46
Machine Learning Application on Mobile Devices
elvismetaphor
0
100
Other Decks in Programming
See All in Programming
Flutterで備える!Accessibility Nutrition Labels完全ガイド
yuukiw00w
0
170
PHPでWebSocketサーバーを実装しよう2025
kubotak
0
320
Porting a visionOS App to Android XR
akkeylab
0
680
状態遷移図を書こう / Sequence Chart vs State Diagram
orgachem
PRO
2
200
イベントストーミング図からコードへの変換手順 / Procedure for Converting Event Storming Diagrams to Code
nrslib
2
1.1k
A full stack side project webapp all in Kotlin (KotlinConf 2025)
dankim
0
150
システム成長を止めない!本番無停止テーブル移行の全貌
sakawe_ee
1
360
商品比較サービス「マイベスト」における パーソナライズレコメンドの第一歩
ucchiii43
0
180
React は次の10年を生き残れるか:3つのトレンドから考える
oukayuka
9
3k
AI駆動のマルチエージェントによる業務フロー自動化の設計と実践
h_okkah
0
230
テスターからテストエンジニアへ ~新米テストエンジニアが歩んだ9ヶ月振り返り~
non0113
2
220
Hack Claude Code with Claude Code
choplin
7
2.6k
Featured
See All Featured
No one is an island. Learnings from fostering a developers community.
thoeni
21
3.4k
Dealing with People You Can't Stand - Big Design 2015
cassininazir
367
26k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
667
120k
Intergalactic Javascript Robots from Outer Space
tanoku
271
27k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
32
2.4k
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
233
17k
Mobile First: as difficult as doing things right
swwweet
223
9.7k
How to train your dragon (web standard)
notwaldorf
96
6.1k
Six Lessons from altMBA
skipperchong
28
3.9k
Done Done
chrislema
184
16k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
tammyeverts
8
340
Why You Should Never Use an ORM
jnunemaker
PRO
58
9.5k
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