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mattak
January 15, 2016
Programming
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100 lines or die
KotlinAndroid勉強会 LT
mattak
January 15, 2016
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Transcript
(less than) 100 lines or die. "OESPJEͰ,PUMJOษڧձ !NBUUBL
とつぜんですが、
Javaで こんなコードありませ んか?
None
͍ͭͷ·ʹ͔͘ͳ͍ͬͯΔߦɻɻɻ
つらい…!!
もし、 10⾏のコードなら?
1ͰΘ͔Δʂ
100⾏のコードなら?
ेඵ͋Ε ཧղͰ͖Δʂ
1000⾏のコードなら?
ͳ͍ͱ ಡΊͳ͍ʂ
1万⾏のコードなら?
もう⾟くて読めない… でも実在します. https://github.com/android/platform_frameworks_base/blob/master/core/java/android/widget/TextView.java#L10190
Մಡੑ (ཧղʹ͔͔Δ࣌ؒ) ߦ ʢ: Πϝʔδਤʣ
Τϯόά͢Δ֬ ߦ ʢ: Πϝʔδਤʣ
ۤ͢Δ࣌ؒ ߦ ʢ: Πϝʔδਤʣ
ΞχϝΛݟΔ࣌ؒ ߦ ʢ: Πϝʔδਤʣ
⻑いコードを メンテナンスしたくな い!!
というわけで
100 lines or die.
95%のソースコードを 100⾏未満にする!
というミッションで アプリを書いてみまし た。
プロジェクト概要
⾔語: ΞʔΩςΫνϟ: 3ΞʔΩςΫνϟϕʔε σʔλόΠϯσΟϯά: RxJava ϥΠϒϥϦ: kotterknife, retrofit, okhttp, …
結果
97% (ϥΠϒϥϦͳͲαϒϓϩδΣΫτͱςετআ͘) 100ߦະຬ 529 files / ߹ܭ: 545 files
31# 133# 108# 88# 65# 39# 26# 18# 14# 7#
5# 4# 4# 1# 0# 0# 0# 1# 0# 0# 0# 0# 0# 0# 0# 0# 1# 0# 20# 40# 60# 80# 100# 120# 140# 0# 10# 20# 30# 40# 50# 60# 70# 80# 90# 100# 110# 120# 130# 140# 150# 160# 170# 180# 190# 200# 210# 220# 230# 240# 250# 260# (16 files / 545 files) 2.9%
MainActivityɺࠓͷͱ͜Ζ99ߦ
ผϓϩδΣΫτͷΞϓϦ(Java)ͱൺֱ
0" 5" 10" 15" 20" 25" 0" 30" 60" 90"120"150"180"210"240"270"300"330"360"390"420"450"480"510"540"570"600"630"660"690"720"750"780"810"840"870"900"930"960"990"
(39 files / 131 files) 29.7%
※ࣾൺ 10ഒͷՄಡੑ্Λ࣮ݱʂ (͖ͯͱ͏Ͱ͢)
Swift൛ͷΞϓϦͱൺֱ (΄΅ࣅͨΑ͏ͳΞʔΩςΫνϟͰͭͬͨ͘)
1" 49" 44" 33" 23" 20"20" 17"17" 11" 8" 8"
10" 2" 3" 4" 3" 4" 5" 5" 0" 2" 0" 1" 0" 2" 0" 1" 1" 2" 1" 0" 0" 1" 0" 1" 1" 0" 0" 0" 0" 0" 0" 0" 1" 0" 0" 0" 0" 0" 0" 0" 1" 0" 10" 20" 30" 40" 50" 60" 0" 20" 40" 60" 80" 100" 120" 140" 160" 180" 200" 220" 240" 260" 280" 300" 320" 340" 360" 380" 400" 420" 440" 460" 480" 500" 520" (67 files / 307 files) 21.8%
Kotlin͍͢͝ʂ (࣮ࡍʹViewControllerͷ͕͞ओͳࠩ)
短く書く⼯夫 (࣌ؒ͋Ε)
ϓϩδΣΫτͷίʔυશମΛ ͖ͬ͢Γग़དྷͨཁҼΛ͍͔ͭ͘
3層アーキテクチャ ベース
http://www.slideshare.net/mokemokechicken/iosandroidmodel ࢀߟ: iOS/AndroidΞϓϦΤϯδχΞ͕ཧղ͖͢ʮModelʯͷৼΔ͍
"DUJWJUZ $VTUPN 7JFX 'SBHNFOU 7JFX .PEFM .PEFM 4FSWJDF Presentation Layer
Business Layer 20͘Β͍ 100͘Β͍ 100͘Β͍ 100͘Β͍ 10͘Β͍
ΘΓͱׂ͚Ͱ͖͍ͯΔͷͰɺ ංେԽ͢ΔϘτϧωοΫfileগͳ͍
CustomViewの活⽤
Activity, Fragment, CustomView ͷ͍͚ - ϚονϣͳActivityʹ͞ΑͳΒ͢Δํ๏ - http://www.slideshare.net/yanzm/droid-kaigi2015-yanzm
Activity << Fragment << CustomView ϑΝΠϧ
খ͞ͳύʔπ(CustomView)Λ ࢁͭ͘Γ͍ճ͢ํ
<?xml version="1.0" encoding="utf-8"?> <me.mattak.sampleapp.CustomView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <TextView
android:id="@+id/text" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </me.mattak.sampleapp.CustomView> CustomViewͰxmlΛΉ (ύʔπখ͘͞খ͚)
class CustomView : FrameLayout { val textView: TextView by bindView(R.id.text)
constructor(context: Context, attrs: AttributeSet) : super(context, attrs) {} constructor(context: Context, attrs: AttributeSet, defStyle: Int) : super(context, attrs, defStyle) {} override fun onFinishInflate() { super.onFinishInflate() if (this.isInEditMode) { return } // model͔Βσʔλऔಘ val data = Observable.just("text") // observable<String>ͷ༰͕TextViewʹө͞ΕΔ TextViewModel(this.textView, data).subscribe() } } CustomViewͰσʔλόΠϯυ
⼩さな ViewModel構想
None
ImageViewModel TextViewModel AudioButtonViewModel NextPageViewModel
ViewModelͰ͍Ζ͍ΖΓա͗ͳ͍ 1ͭͷViewModelͰ1ͭͷ͜ͱΛΔ
Extensionの活⽤
// File: ScoreEntity.kt data class ScoreEntity( val param1: Int, val
param2: Int ) αʔόʔͱ௨৴͢Δࡍͷ Entityใࣗಈੜ͞ΕΔ
// File: ScoreEntityExtension.kt val ScoreEntity.score: Int get() = param1
* param2 Entityʹਵ͢Δͪΐͬͱͨ͠ϩδοΫ Extensionͱͯ͠ผϑΝΠϧʹॻ͘
ͪΐͬͱͨ͠ϩδοΫ͕ γϣʔτΧοτͰ͖͖ͯͬ͢Γʂ
まとめ
まとめ KotlinͰίʔυΛͬͱ͘ ϝϯς͘͢͠͠Α͏ʂ
Thank you!