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
Kotlin + RxBinding = ❤️
Search
Lovis
October 14, 2016
Programming
1
860
Kotlin + RxBinding = ❤️
Lightning talk from GDG Devfest Hamburg 2016
Lovis
October 14, 2016
Tweet
Share
More Decks by Lovis
See All by Lovis
Microservices with Kotlin and Ktor
lmller
0
720
Gang of Four Patterns in Kotlin
lmller
2
160
Convert your legacy (Android) app to Kotlin!
lmller
0
110
Kotlin ist auch eine Insel
lmller
0
430
Other Decks in Programming
See All in Programming
Startups on Rails in Past, Present and Future–Irina Nazarova, RailsConf 2025
irinanazarova
0
110
Result型で“失敗”を型にするPHPコードの書き方
kajitack
5
650
LT 2025-06-30: プロダクトエンジニアの役割
yamamotok
0
760
たった 1 枚の PHP ファイルで実装する MCP サーバ / MCP Server with Vanilla PHP
okashoi
1
260
第9回 情シス転職ミートアップ 株式会社IVRy(アイブリー)の紹介
ivry_presentationmaterials
1
320
効率的な開発手段として VRTを活用する
ishkawa
0
140
Blazing Fast UI Development with Compose Hot Reload (droidcon New York 2025)
zsmb
1
290
ペアプロ × 生成AI 現場での実践と課題について / generative-ai-in-pair-programming
codmoninc
1
18k
Webの外へ飛び出せ NativePHPが切り拓くPHPの未来
takuyakatsusa
2
550
チームで開発し事業を加速するための"良い"設計の考え方 @ サポーターズCoLab 2025-07-08
agatan
1
420
Rubyでやりたい駆動開発 / Ruby driven development
chobishiba
1
710
20250704_教育事業におけるアジャイルなデータ基盤構築
hanon52_
5
790
Featured
See All Featured
Dealing with People You Can't Stand - Big Design 2015
cassininazir
367
26k
Rails Girls Zürich Keynote
gr2m
95
14k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
10
950
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
[RailsConf 2023] Rails as a piece of cake
palkan
55
5.7k
The MySQL Ecosystem @ GitHub 2015
samlambert
251
13k
Optimizing for Happiness
mojombo
379
70k
The World Runs on Bad Software
bkeepers
PRO
69
11k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
161
15k
Six Lessons from altMBA
skipperchong
28
3.9k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
30
2.1k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
357
30k
Transcript
Kotlin + RxBinding = Lovis Möller @lovisbrot #devfestHH
RxBinding • JVM language • developed by JetBrains • Null
safety, immutability • Extension functions • It’s an Island
RxBinding • JVM language • developed by JetBrains • Null
safety, immutability • Extension functions • It’s an Island • Make your Android Views reactive
RxBinding • JVM language • developed by JetBrains • Null
safety, immutability • Extension functions • It’s an Island • Make your Android Views reactive RxView.clicks(myView) .filter(…) .flatMap(…) .subscribe(…)
RxBinding • JVM language • developed by JetBrains • Null
safety, immutability • Extension functions • It’s an Island • Make your Android Views reactive RxView.clicks(myView) .filter(…) .flatMap(…) .subscribe(…) • JakeWharton
RxBinding • JVM language • developed by JetBrains • Null
safety, immutability • Extension functions • It’s an Island • Make your Android Views reactive RxView.clicks(myView) .filter(…) .flatMap(…) .subscribe(…) • JakeWharton ✔
Kotlin • JVM language • developed by JetBrains • Null
safety, immutability • Extension functions • It’s an Island
Kotlin • JVM language • developed by JetBrains • Null
safety, immutability • Extension functions • It’s an Island
Kotlin • JVM language • developed by JetBrains • Null
safety, immutability • Extension functions • It’s an Island
Kotlin • JVM language • developed by JetBrains • Null
safety, immutability • Extension functions • It’s an Island
Kotlin • JVM language • developed by JetBrains • Null
safety, immutability • Extension functions • It’s an Island
Kotlin • JVM language • developed by JetBrains • Null
safety, immutability • Extension functions • It’s an Island
Kotlin - Extension Functions fun String?.orEmpty(): String { if(this ==
null) return "" return this }
Kotlin - Extension Functions fun String?.orEmpty(): String { } if(this
== null) return "" return this }
Kotlin - Extension Functions fun String?.orEmpty(): String { if(this ==
null) return "" return this }
Kotlin - Extension Functions fun String?.orEmpty(): String { if(this ==
null) return "" return this } val name: String? = null val option = name.orEmpty()
Kotlin - Extension Functions fun String?.orEmpty(): String { return this
?: "" } val name: String? = null val option = name.orEmpty()
Kotlin - Extension Functions fun String?.orEmpty() = this ?: ""
return this ?: "" } val name: String? = null val option = name.orEmpty()
Get that View! <EditText android:id="@+id/editName" android:layout_width="wrap_content" android:layout_height="wrap_content" />
Get that View! <EditText android:id="@+id/editName" android:layout_width="wrap_content" android:layout_height="wrap_content" /> EditText name
= (EditText) findViewById(R.id.editName);
Get that View! <EditText android:id="@+id/editName" android:layout_width="wrap_content" android:layout_height="wrap_content" /> @BindView(R.id.editName) EditText
name;
Get that View! <EditText android:id="@+id/editName" android:layout_width="wrap_content" android:layout_height="wrap_content" /> val name:
TextView by bindView(R.id.first_name)
Get that View! <EditText android:id="@+id/editName" android:layout_width="wrap_content" android:layout_height="wrap_content" /> import kotlinx.android.synthetic.main.activity_main.*
Get that View! <EditText android:id="@+id/editName" android:layout_width="wrap_content" android:layout_height="wrap_content" /> import kotlinx.android.synthetic.main.activity_main.*
... editName.text = "Lovis"
Get that View! <EditText android:id="@+id/editName" android:layout_width="wrap_content" android:layout_height="wrap_content" /> import kotlinx.android.synthetic.main.activity_main.*
... editName.text = "Lovis" //no findViewById necessary!
Java + RxBinding EditText name = ... RxTextView.textChanges(name) .debounce(400, TimeUnit.MILLISECONDS)
.flatMap(text -> api.sendToServer(text)) .observeOn(AndroidSchedulers.mainThread()) .subscribe( this::handleResponse, this::handleError ); return this ?: "" }
Java + RxBinding EditText name = ... RxTextView.textChanges(name) .debounce(400, TimeUnit.MILLISECONDS)
.flatMap(text -> api.sendToServer(text)) .observeOn(AndroidSchedulers.mainThread()) .subscribe( this::handleResponse, this::handleError ); return this ?: "" }
Java + RxBinding EditText name = ... RxTextView.textChanges(name) .debounce(400, TimeUnit.MILLISECONDS)
.flatMap(text -> api.sendToServer(text)) .observeOn(AndroidSchedulers.mainThread()) .subscribe( this::handleResponse, this::handleError ); return this ?: "" }
Java + RxBinding EditText name = ... RxTextView.textChanges(name) .debounce(400, TimeUnit.MILLISECONDS)
.flatMap(text -> api.sendToServer(text)) .observeOn(AndroidSchedulers.mainThread()) .subscribe( this::handleResponse, this::handleError ); return this ?: "" }
Java + RxBinding EditText name = ... RxTextView.textChanges(name) .debounce(400, TimeUnit.MILLISECONDS)
.flatMap(text -> api.sendToServer(text)) .observeOn(AndroidSchedulers.mainThread()) .subscribe( this::handleResponse, this::handleError ); return this ?: "" }
Java + RxBinding EditText name = ... RxTextView.textChanges(name) .debounce(400, TimeUnit.MILLISECONDS)
.flatMap(text -> api.sendToServer(text)) .observeOn(AndroidSchedulers.mainThread()) .subscribe( this::handleResponse, this::handleError ); return this ?: "" }
Java + RxBinding EditText name = ... RxTextView.textChanges(name) .debounce(400, TimeUnit.MILLISECONDS)
.flatMap(text -> api.sendToServer(text)) .observeOn(AndroidSchedulers.mainThread()) .subscribe( this::handleResponse, this::handleError ); return this ?: "" }
Java + RxBinding EditText name = ... RxTextView.textChanges(name) .debounce(400, TimeUnit.MILLISECONDS)
.flatMap(text -> api.sendToServer(text)) .observeOn(AndroidSchedulers.mainThread()) .subscribe( this::handleResponse, this::handleError ); return this ?: "" } static method looks ugly
Java + RxBinding EditText name = ... RxTextView.textChanges(name) .debounce(400, TimeUnit.MILLISECONDS)
.flatMap(text -> api.sendToServer(text)) .observeOn(AndroidSchedulers.mainThread()) .subscribe( this::handleResponse, this::handleError ); return this ?: "" } NOT RxEditText! static method looks ugly
Java + RxBinding • RxAbsListView • RxAdapter • RxAdapterView •
RxAutoCompleteTextView • RxCheckedTextView • RxCompoundButton • RxProgressBar • RxRadioGroup • RxRecyclerView • RxSeekBar • RxView • RxViewGroup • RxSnackbar • RxAppBarLayout • RxDrawerLayout • RxNestedScrollView • RxSwipeRefreshLayout • RxSearchView • RxToolbar • …
Java + RxBinding • RxButton → clicks() ❓ • RxEditText
RxTextView → textChanges()
Java + RxBinding • RxButton RxView → clicks() • RxEditText
RxTextView → textChanges()
Java + RxBinding • RxButton RxView → clicks() • RxEditText
RxTextView → textChanges()
Java + RxBinding • RxButton RxView → clicks() • RxEditText
RxTextView → textChanges()
Kotlin + RxBinding val name: EditText = ... name.textChanges() .debounce(400,
TimeUnit.MILLISECONDS) .flatMap { text -> api.sendToServer(text) } .observeOn(AndroidSchedulers.mainThread()) .subscribe( { handleResponse(it) }, { handleError(it) } ); return this ?: "" }
Kotlin + RxBinding val name: EditText = ... name.textChanges() .debounce(400,
TimeUnit.MILLISECONDS) .flatMap { text -> api.sendToServer(text) } .observeOn(AndroidSchedulers.mainThread()) .subscribe( { handleResponse(it) }, { handleError(it) } ); return this ?: "" } extension method
Kotlin + RxBinding val name: EditText = ... name.textChanges() .debounce(400,
TimeUnit.MILLISECONDS) .flatMap { text -> api.sendToServer(text) } .observeOn(AndroidSchedulers.mainThread()) .subscribe( { handleResponse(it) }, { handleError(it) } ); return this ?: "" } extension method No need to know!
Kotlin + RxBinding val button: Button = ... val buttonClicks
= button.clicks().share() buttonClicks.subscribe { //do something useful } buttonClicks.subscribe { //two listeners on one button! } return this ?: "" }
Kotlin + RxBinding val button: Button = ... // in
Java: Observable<Void> buttonClicks = ... val buttonClicks = button.clicks().share() buttonClicks.subscribe { //do something useful } buttonClicks.subscribe { //two listeners on one button! } return this ?: "" }
Kotlin + RxBinding val button: Button = ... val buttonClicks
= button.clicks().share() buttonClicks.subscribe { //do something useful } buttonClicks.subscribe { //two listeners on one button! } return this ?: "" }
Kotlin + RxBinding val button: Button = ... val buttonClicks
= button.clicks().share() buttonClicks.subscribe { //do something useful } buttonClicks.subscribe { //two listeners on one button! } return this ?: "" }
Kotlin + RxBinding val button: Button = ... val buttonClicks
= button.clicks().share() buttonClicks.subscribe { //do something useful } buttonClicks.subscribe { //two listeners on one button! } return this ?: "" }
Kotlin + RxBinding val button: Button = ... val buttonClicks
= button.clicks().share() val sub1 = buttonClicks.subscribe { //do something useful } val sub2 = buttonClicks.subscribe { //two listeners on one button! } return this ?: "" }
Kotlin + RxBinding val button: Button = ... val compositeSub
= CompositeSubscription() val buttonClicks = button.clicks().share() val sub1 = buttonClicks.subscribe { //do something useful } val sub2 = buttonClicks.subscribe { //two listeners on one button! } return this ?: "" }
Kotlin + RxBinding val button: Button = ... val compositeSub
= CompositeSubscription() val buttonClicks = button.clicks().share() compositeSub += buttonClicks.subscribe { //do something useful } compositeSub += buttonClicks.subscribe { //two listeners on one button! } return this ?: "" }
• kotlinlang.org • try.kotlinlang.org • leanpub.com/kotlin-for-android-developers • https://github.com/JakeWharton/RxBinding Lovis Möller
@lovisbrot #devfestHH
println("Thanks a lot!") Lovis Möller @lovisbrot #devfestHH