Anko͸؁ͯ͘ඒຯ͍͠ ʙAnkoʹݟΔKotlinͷදݱྗʙ ΤϜεϦʔY(VOPTZ#FFSCBTIʂ HVOPTZCFFS 
 ௕ᖒଠ࿠!OHTX@UBSP

ࣗݾ঺հ w ௕ᖒଠ࿠!OHTX@UBSP w "OESPJEΤϯδχΞ w ,PUMJOΤϰΝϯδΣϦετ ࣗশ w ࡀɺֈ࠲ɺͱ͕େ޷͖

Kotlinͱ͸ w +FU#SBJOT։ൃͷ+7.ݴޠ w "OESPJE΋αϙʔτ w ೥ൃදɺ·ͩϕʔλ൛ w "OESPJE+BWB͔Β,PUMJO৐Γ׵͑ϫϯνϟϯ w ࠷ۙɺ঺հهࣄ͕ཚཱͯ͠ΔͷͰͦͪΒࢀর

Ankoͱ͸ w ,PUMJOͰهड़͞Εͨ"OESPJEϥΠϒϥϦ w +FU#SBJOT։ൃʢઆಘྗɾ҆৺ײ͕͋Δʣ w ओʹ6*Λ૊ΈཱͯΔ%4-

UIΛ૊ΈཱͯΔDSL w جຊతʹ"OESPJEͰ͸9.-Ͱ6*Λදݱ͢Δ w ࠶ར༻ੑɺ҆શੑɺύϑΥʔϚϯεͷ໘Ͱෆར w ͱ͸͍͑ίʔυͰ໋ྩతʹ6*Λߏங͢Δͷμα Πʢ4XJOHΈ͍ͨͳΠϝʔδʣ w %4-Ͱએݴతʹ6*Λߏங͢Δ
 ʢ+BWB'94DSJQUΈ͍ͨͳΠϝʔδʣ

ඪ४APIͰΰϦΰϦ΍Δ val act = this! val layout = LinearLayout(act)! layout.orientation = LinearLayout.VERTICAL! val name = EditText(act)! val button = Button(act)! button.text = "Say Hello"! button.setOnClickListener {! Toast.makeText(act,! "Hello, ${name.text}!”,! Toast.LENGTH_SHORT).show()! }! layout.addView(name)! layout.addView(button)

AnkoͰDSL verticalLayout {! val name = editText()! button("Say Hello") {! onClick {! toast("Hello, ${name.text}!”)! }! }! }

Ͳ͏ಈ͍͍ͯΔͷ͔ There is no .

ϥϜμࣜ Lambda Expression

ߴ֊ؔ਺ͱϥϜμࣜ // Ҿ਺ʹAΛऔͬͯBΛฦؔ͢਺fΛҾ਺ʹऔΔؔ਺! fun convert(target: A,! f: (A)->B) = f(target)! ! convert(1, { x: Int -> x * 2 }) //=> 2! convert(2, { x -> x * 2}) //=> 4! convert(3, { it * 2 }) //=> 6! convert(4) { it * 2 } //=> 8

֦ுؔ਺ Extension Function

֦ுؔ਺ fun String.hello() = “Hello, $this”! ! “world”.hello() //=> “Hello, world”

֦ுؔ਺ × ϥϜμࣜ fun A.convert(f: (A)->B) = f(this)! ! 3.convert({ x: Int -> x * 2}) //=> 6! 3 convert { it * 2 } //=> 6

Anko class MainActivity : Activity() {! override fun onCreate(savedInstanceState: Bundle?) {! super.onCreate(savedInstanceState)! ! verticalLayout {! val name = editText()! button("Say Hello") {! onClick { toast("Hello, ${name.text}!") }! }! }! }! }

Anko class MainActivity : Activity() {! override fun onCreate(savedInstanceState: Bundle?) {! super.onCreate(savedInstanceState)! ! verticalLayout {! val name = editText()! button("Say Hello") {! onClick { toast("Hello, ${name.text}!") }! }! }! }! } "DUJWJUZͷ֦ுؔ਺ UIJT͕লུ͞ΕͯΔ

Anko class MainActivity : Activity() {! override fun onCreate(savedInstanceState: Bundle?) {! super.onCreate(savedInstanceState)! ! verticalLayout {! val name = editText()! button("Say Hello") {! onClick { toast("Hello, ${name.text}!") }! }! }! }! } ͜ͷUIJT͸ WFSUJDBM-BZPVU

Anko class MainActivity : Activity() {! override fun onCreate(savedInstanceState: Bundle?) {! super.onCreate(savedInstanceState)! ! this.verticalLayout {! val name = this.editText()! this.button(“Say Hello") {! onClick { toast("Hello, ${name.text}!") }! }! }! }! } UIJT͕ผͷ΋ͷΛࢦ͢ Կނ͔ʁ

֦ுؔ਺ΛҾ਺ʹऔΔߴ֊ؔ਺ class Builder { fun foo() {} }! ! fun build(f: Builder.() -> Unit) {! Builder().f()! }! ! build {! foo()! }

Կ͕خ͍͠ͷ͔ verticalLayout {! button(“foo”)! verticalLayout {! button(“bar”)! verticalLayout {! button(“baz”)! }! }! }

Կ͕خ͍͠ͷ͔ verticalLayout {! button(“foo”)! verticalLayout {! button(“bar”)! verticalLayout {! button(“baz”)! }! }! } ֊૚ߏ଄ΛදݱͰ͖Δ ϝιουͷείʔϓ ΛߜΕΔ ܕ҆શ OVMM҆શ

XMLͰฤू͢Δͱ ը໘ϓϨϏϡʔ ݟΕΔ͡ΌΜʁ

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ͦΕɺAnkoͰ΋ Ͱ͖·͢ʂ

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࢖Θͳ͍ख͸ͳ͍

͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠