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ɹɹɹղ๤ dόΠτίʔυΛಡΈղ͘d %SPJE,BJHJ 3PPNd 5PTIJIJSP:BHJ

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"CPVU.F w 5PTIJIJSP:BHJ !TZTZBHJ w DPPLQBE w "OESPJEΤϯδχΞ ٕज़෦௕

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,PUMJO

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,PUMJO΍ͬͯ·͔͢ʁ

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+BWBʹൺ΂ͯศརͳͷ͸෼͔ΔΜͩ ͚ͲɺͰ΋·͊ผʹ+BWBΛ࢖͍ͬͯ ͯΫϦςΟΧϧʹࠔ͍ͬͯΔΘ͚Ͱ ͸ͳ͍͠ͳʙֶशίετͱ͔νʔϜ ΁ͷಋೖίετΛߟ͑Δͱͦ͜·Ͱ ࢫຯΛײ͡ΒΕΔΘ͚Ͱ΋ͳ͍͠ͳʙ

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w ,PUMJOίϯύΠϥ͕ੜ੒ͨ͠+BWBόΠτίʔ υͰಡΉ͜ͱͰɺ,PUMJO͕ߦͬͯ͘ΕΔ࢓ࣄ Λཧղ͢Δ w ,PUMJOΛॻ͘ͱ͖ʹɺ+BWBͩͱͲ͏ͳͬͯ ͍Δ͔ΠϝʔδͰ͖ΔΑ͏ʹͳΔɻࣗ෼Ͱ֬ ೝͰ͖ΔΑ͏ʹͳΔ w ,PUMJOΛ࢖͏͜ͱͰলུͰ͖ͨϘΠϥʔϓϨʔ τίʔυ͕ՄಡੑΛͲͷΑ͏ʹߴΊɺઃܭʹ ӨڹΛ༩͑Δͷ͔ʹ͍ͭͯΠϝʔδ͕༙͘ ຊηογϣϯͷ໨త

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࠷ऴతʹ ײͯ͡΄͍͜͠ͱ

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͋ɺͳʔΜͩ +BWBʹ͢Δͱ ͜Μͳײ͡ͳͷ͔

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,PUMJO ؆୯ศར͡ΌΜ

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,PUMJO ΍ͬͯΈΔ͔ʙ

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w ,PUMJOͷಛఆͷݴޠػೳʹ͍ͭͯ ؆୯ʹղઆ͢Δ w ͦͷݴޠػೳΛ࢖ͬͨίʔυΛσ ίϯύΠϧ͠ɺ݁ՌΛಡΉ w +BWBͰॻ͘ͱ͖ͱൺ΂ͯԿΛ΍ͬ ͯ͘Ε͍ͯΔ͔ΛݟΔ ຊηογϣϯͷΞϓϩʔν

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σίϯύΠϧͷํ๏

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σίϯύΠϧͷํ๏

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σίϯύΠϧͷํ๏

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σίϯύΠϧͷํ๏

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w OVMMڐ༰ܕ w ؔ਺ܕͱϥϜμࣜ w ֦ுؔ਺ w ϓϩύςΟ ΞδΣϯμલฤ

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w ઃܭʹ༩͑ΔӨڹ w OVMMڐ༰ܕ w ֦ுؔ਺ ΞδΣϯμޙฤ

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OVMMڐ༰ܕ

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w OVMMڐ༰ܕ͸Ҿ਺΍ม਺΍໭Γ஋͕ɺ OVMMʹͳΓಘΔ͔Ͳ͏͔Λ໌ࣔతʹએݴ ͢Δػೳ OVMMڐ༰ܕͱ͸Կ͔ val name:String? = null ܕͷ຤ඌʹ Λ͚ͭΔ͜ͱͰએݴͰ͖Δ

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w ҰํͰඇOVMMܕ͸OVMMΛ୅ೖͰ͖ͳ͍ɻ ม਺΍Ҿ਺΍໭Γ஋͕ඇOVMMܕͳΒɺ஋ ͕ඞͣඇOVMMͰ͋Δ͜ͱΛอূ͢Δ OVMMڐ༰ܕͱ͸Կ͔ val name:String = "Hello" // OK val name:String = null // Error fun toString() :String ໭Γ஋͕ඇOVMMͰ͋Δ͜ͱΛอূ͢Δ

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w OVMMڐ༰ܕ͸ͦͷ··ૢ࡞Ͱ͖ͳ͍ OVMMڐ༰ܕͱ͸Կ͔ str.length ίϯύΠϧΤϥʔʹͳΔ

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w OVMMڐ༰ܕʹରͯ҆͠શͳݺͼग़͠ͱة ݥͳݺͼग़͠Λબ୒͢Δ OVMMڐ༰ܕͱ͸Կ͔ // nullͳΒԿ΋͠ͳ͍ str?.length // nullͷ৔߹NullPointerException str!!.length

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w Ҿ਺΍໭Γ஋ΛඇOVMMܕʹ͢Δ͜ͱͰؔ ਺಺Ͱ͸ؔ৺ࣄʹूதͰ͖Δ OVMMڐ༰ܕͱ͸Կ͔ fun semitransparent(view: View) { view.alpha = 0.5f } ؔ਺಺ͰWJFX͕ඇOVMMͰ͋Δ͜ͱΛอূ͢Δ

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w OVMMͷڥքͰҧ൓͕͋ΔͱίϯύΠϥ͕ ڭ͑ͯ͘ΕΔ OVMMڐ༰ܕͱ͸Կ͔ val text: View? = findViewById(R.id.text) semitransparent(text) 5ZQFNJTTNBUDIͰίϯύΠϧΤϥʔ

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w ةݥͳݺͼग़͠͸ةݥͳͷͰ௚͢΂͖ ͱ͍͏͜ͱ͕Θ͔Δ OVMMڐ༰ܕͱ͸Կ͔ val text: View? = findViewById(R.id.text) semitransparent(text!!) ةݥͳݺͼग़͠ɻཁվળͷγάφϧ

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w ةݥͳݺͼग़͠͸ةݥͳͷͰ௚͢΂͖ ͱ͍͏͜ͱ͕Θ͔Δ OVMMڐ༰ܕͱ͸Կ͔ val text: View? = findViewById(R.id.text) text?.let { semitransparent(it) } OVMM͡Όͳ͚Ε͹࣮ߦɻ

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OVMMڐ༰ܕ͸+BWBͰ ͲͷΑ͏ʹ࣮ݱ͞Ε͍ͯΔ͔ʁ

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val nonNull: String = ”nonNull” nonNull.length

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val nonNull: String = ”nonNull” nonNull.length String nonNull = “nonNull"; nonNull.length(); +BWBʹͳΔ͚ͩ

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val nullable: String? = null nullable?.length

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val nullable: String? = null nullable?.length String nullable = (String)null; if(nullable != null) { nullable.length(); } OVMMνΣοΫ͕௥Ճ͞ΕΔ

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nullable!!.length

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nullable!!.length if(nullable == null) { Intrinsics.throwNpe(); } nullable.length(); OVMMͳΒྫ֎Λεϩʔ

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fun length(text: String) = text.length

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Ҿ਺͕OVMMͳΒྫ֎Λεϩʔ public final int length(@NotNull String text) { Intrinsics.checkParameterIsNotNull(text, “text"); return text.length(); } fun length(text: String) = text.length

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w ͳΒOVMMνΣοΫΛ௥Ճ͢Δ w ͳΒOVMMνΣοΫͱྫ֎ͷεϩʔΛ௥Ճ ͢Δ w ؔ਺ͷҾ਺͕ඇOVMMܕͳΒࣄલ৚݅ͷ νΣοΫΛ௥Ճ͢Δ w ཁ͢ΔʹOVMMνΣοΫ͕ඞཁͳͱ͜Ζʹ OVMMνΣοΫΛࣗಈͰࠩ͠ࠐΜͰ͘ΕΔ OVMMڐ༰ܕ͕΍͍ͬͯΔ͜ͱ

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ؔ਺ܕɺϥϜμࣜ

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w ϑΝʔετΫϥεΦϒδΣΫτɻؔ਺Λ ม਺ʹ୅ೖͨ͠Γɺؔ਺ͷҾ਺ʹͨ͠ Γɺ໭Γ஋ʹͨ͠ΓͰ͖Δ ؔ਺ܕͱ͸Կ͔ val onClick: (View) -> Unit Ҿ਺ʹ7JFXΛडऔΓɺ໭Γ஋͸ͳ͍ؔ਺Λද͢

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w ߴ֊ؔ਺Λهड़Ͱ͖Δ ؔ਺ܕͱ͸Կ͔ fun calc( a: Int, b: Int, op: (Int, Int) -> Int ): Int { return op(a, b) }

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ϥϜμࣜͱ͸Կ͔ calc(1, 2, { a, b -> a + b }) *OU *OU *OUܕΛͦͷ৔Ͱهड़Ͱ͖Δ w ؔ਺Ϧςϥϧɻؔ਺ܕͷ࣮૷Λࣜͱ͠ ͯهड़Ͱ͖Δ

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ؔ਺ܕͱϥϜμࣜ listOf(1, 2, 3)
 .filter { it % 2 == 0 }
 .map { it * 2 } // 4 w ڧྗͳॲཧΛ؆ܿʹهड़Ͱ͖Δ

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ؔ਺ܕͱϥϜμࣜ͸+BWBͰ ͲͷΑ͏ʹ࣮ݱ͞Ε͍ͯΔ͔ʁ

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val onClick: (View) -> Unit

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val onClick: (View) -> Unit @NotNull private final Function1 onClick; ਖ਼֬ʹ͸'VODUJPO7JFX 6OJU

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public interface Function1 : Function { public operator fun invoke(p1: P1): R } 'VODUJPO͸ͨͩͷΠϯλϑΣʔε ؔ਺ܕ͸Ҿ਺ͷ਺ʹԠͯ͡ 'VODUJPO/ʹม׵͞ΕΔ

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calc(1, 2, { a, b -> a + b })

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calc(1, 2, { a, b -> a + b }) calc(1, 2, (Function2)null.INSTANCE);

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calc(1, 2, { a, b -> a + b }) calc(1, 2, (Function2)null.INSTANCE); ίϯύΠϥ͕ϥϜμࣜΛ੩తͩͱ൑அͨ͠৔߹͸ γϯάϧτϯͷΫϥεΛੜ੒͢Δ

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final class call$1 extends kotlin.jvm.internal.Lambda implements Function1 { public call$1() { super(2); } public final int invoke(int a, int b) { return a + b; } public final static $call$1 INSTANCE = new call$1(); } खಈͰ௚͢ͱ͜Μͳײ͡

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final class call$1 extends kotlin.jvm.internal.Lambda implements Function1 { public call$1() { super(2); } public final int invoke(int a, int b) { return a + b; } public final static $call$1 INSTANCE = new call$1(); } -BNCEBΛܧঝ

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final class call$1 extends kotlin.jvm.internal.Lambda implements Function1 { public call$1() { super(2); } public final int invoke(int a, int b) { return a + b; } public final static $call$1 INSTANCE = new call$1(); } Ҿ਺ͷ਺Λ਌Ϋϥεʹ౉͢ -BNCEBΛܧঝ

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final class call$1 extends kotlin.jvm.internal.Lambda implements Function2 { public call$1() { super(2); } public final int invoke(int a, int b) { return a + b; } public final static $call$1 INSTANCE = new call$1(); } Ҿ਺ͷ਺Λ਌Ϋϥεʹ౉͢ 'VODUJPOΛ࣮૷ -BNCEBΛܧঝ

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final class call$1 extends kotlin.jvm.internal.Lambda implements Function1 { public call$1() { super(2); } public final int invoke(int a, int b) { return a + b; } public final static $call$1 INSTANCE = new call$1(); } Ҿ਺ͷ਺Λ਌Ϋϥεʹ౉͢ γϯάϧτϯ 'VODUJPOΛ࣮૷ -BNCEBΛܧঝ

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val seed = 10 calc(1, 2, { a, b -> a + b + seed })

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val seed = 10 calc(1, 2, { a, b -> a + b + seed }) final byte seed = 10; calc(1, 2, (Function2)(new Function2(2) { public final int invoke(int a, int b) { return a + b + seed; } })); Ϋϩʔδϟͷ৔߹͸ແ໊ΫϥεΛੜ੒͢Δ

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var seed = 10 calc(1, 2, { a, b -> seed++; a + b })

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var seed = 10 calc(1, 2, { a, b -> seed++; a + b }) final IntRef seed = new IntRef(); seed.element = 10; calc(1, 2, (Function2)(new Function2(2) { public final int invoke(int a, int b) { int var3 = seed.element++; return a + b; } })); Ωϟϓνϟͨ͠ม਺Λมߋ͢Δ৔߹͸ 3FGΫϥε͕࢖ΘΕΔ

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w ؔ਺ܕΛҾ਺ͷ਺ʹԠͨ͡'VODUJPO/Πϯλ ϑΣʔεʹม׵͢Δ w ϥϜμࣜΛɺ-BNCEBΛܧঝͯ͠'VODUJPO/Λ ࣮૷͢ΔΫϥεʹม׵͢Δ w ϥϜμࣜͷத਎ʹΑͬͯ࠷దͳίʔυΛੜ੒͢Δ w جຊతʹ͸SFUSPMBNCEB΍KBDLͳͲͰͷ+BWB ϥϜμࣜαϙʔτͱಉ͡Α͏ͳΞϓϩʔνͰؔ਺ ܕΛ࣮ݱͯ͘͠ΕΔɻࠩ෼ͱͯ͠͸Ϋϩʔδϟ͕ ͪΐͬͱॊೈͱ͍͏͘Β͍ ؔ਺ܕɺϥϜμ͕ࣜ΍͍ͬͯΔ͜ͱ

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֦ுؔ਺

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w طଘͷΫϥεʹରͯ͠৽͍ؔ͠਺Λ௥Ճ Ͱ͖Δػೳ ֦ுؔ਺ͱ͸Կ͔ fun Int.reversed(): Int { return toString().reversed().toInt() }

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w ର৅ͷΫϥεͷΠϯελϯε͔Β௥Ճ͠ ͨؔ਺Λݺͼग़ͤΔΑ͏ʹͳΔ ֦ுؔ਺ͱ͸Կ͔ 334017.reversed() // 710433

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w ৑௕ͳॲཧΛ֦ுؔ਺ʹ·ͱΊͨΓɺ ੹຿Λ௥Ճͨ͠ΓͰ͖Δ ֦ுؔ਺ͱ͸Կ͔ context.getSystemService(Context.WINDOW_SERVICE) as WindowManager

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w ৑௕ͳॲཧΛ֦ுؔ਺ʹ·ͱΊͨΓɺ ੹຿Λ௥Ճͨ͠ΓͰ͖Δ ֦ுؔ਺ͱ͸Կ͔ context.getWindowService() context.getSystemService(Context.WINDOW_SERVICE) as WindowManager

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֦ுؔ਺͸+BWBͰ ͲͷΑ͏ʹ࣮ݱ͞Ε͍ͯΔ͔ʁ

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fun Context.getWindowService() = getSystemService(Context.WINDOW_SERVICE) as WindowManager

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@NotNull public static final WindowManager getWindowService(@NotNull Context $receiver) { Intrinsics.checkParameterIsNotNull($receiver, “$receiver"); Object var10000 = $receiver.getSystemService(“window"); if(var10000 == null) { throw new TypeCastException("null cannot be cast to non-null type android.view.WindowManager”); } else {
 return (WindowManager)var10000;
 } } fun Context.getWindowService() = getSystemService(Context.WINDOW_SERVICE) as WindowManager

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public static final WindowManager getWindowService(Context $receiver) { Object var10000 = $receiver.getSystemService(“window");
 return (WindowManager)var10000; } fun Context.getWindowService() = getSystemService(Context.WINDOW_SERVICE) as WindowManager ˞γϯϓϧʹͨ͠΋ͷ ର৅ͷΫϥεΛୈҰҾ਺ʹऔΔ੩తؔ਺͕ੜ੒͞ΕΔ

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context.getWindowService()

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ExtensionsKt.getWindowService(context) context.getWindowService() ͜͜͸֦ுؔ਺Λఆٛͨ͠Ϋϥεʹґଘ͢Δ

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w ର৅ͷΫϥεΛୈҰҾ਺ʹऔΔ੩తؔ਺ Λੜ੒͢Δ w ֦ுؔ਺ͷݺͼग़͠Λ੩తؔ਺ͷݺͼग़ ͠ʹม׵͢Δ w ಺෦తʹ͸੩తͳؔ਺ΛूΊͨ6UJMΫϥε ͱಉ͡ɻର৅ͷΫϥεʹ੹຿Λ௥Ճͨ͠ Α͏ʹݟ͔͚ͤΒΕΔΑ͏ʹ͍ͯ͠Δ ֦ுؔ਺͕΍͍ͬͯΔ͜ͱ

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ϓϩύςΟ

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w Ϋϥε͕࣋ͭσʔλͱͯ͠એݴ͢Δɻ ϑΟʔϧυͷ୅ΘΓʹ࢖͏ ϓϩύςΟͱ͸Կ͔ class Product( val id: Int, var name: String )

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w ίʔυ্Ͱ͸௚઀ϓϩύςΟʹΞΫη ε͍ͯ͠ΔΑ͏ʹݟ͑Δ͕ɺ҉໧తʹΞ ΫηαΛ͍࣋ͬͯΔ ϓϩύςΟͱ͸Կ͔ val product = Product(1, “tomato") val id = product.id product.name = "meat"

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w ΧελϜΞΫηαΛ࣮૷Ͱ͖Δ ϓϩύςΟͱ͸Կ͔ class Product(val id: Int) { var name: String = “" get() = field set(value) { field = value } } ϓϩύςΟΞΫηε͸ඞͣΞΫηαΛհ͢ɻ ΞΫηα಺͔ΒͰͷΈΞΫηεͰ͖Δ όοΩϯάϑΟʔϧυͱ͍͏࣮ମ͕͋Δ

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ϓϩύςΟ͸+BWBͰ ͲͷΑ͏ʹ࣮ݱ͞Ε͍ͯΔ͔ʁ

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class Product(val id: Int, var name: String)

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private final int id; @NotNull private String name; public final int getId() { return this.id; } @NotNull public final String getName() { return this.name; } public final void setName(@NotNull String var1) Intrinsics.checkParameterIsNotNull(var1, “"); this.name = var1; } class Product(val id: Int, var name: String)

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private final int id; @NotNull private String name; public final int getId() { return this.id; } @NotNull public final String getName() { return this.name; } public final void setName(@NotNull String var1) Intrinsics.checkParameterIsNotNull(var1, “"); this.name = var1; } class Product(val id: Int, var name: String) QSJWBUFͳϑΟʔϧυ͕એݴ͞ΕΔ

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private final int id; @NotNull private String name; public final int getId() { return this.id; } @NotNull public final String getName() { return this.name; } public final void setName(@NotNull String var1) Intrinsics.checkParameterIsNotNull(var1, “"); this.name = var1; } class Product(val id: Int, var name: String) QSJWBUFͳϑΟʔϧυ͕એݴ͞ΕΔ WBMͷ৔߹HFUUFSͷΈੜ੒͞ΕΔ

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private final int id; @NotNull private String name; public final int getId() { return this.id; } @NotNull public final String getName() { return this.name; } public final void setName(@NotNull String var1) Intrinsics.checkParameterIsNotNull(var1, “"); this.name = var1; } class Product(val id: Int, var name: String) QSJWBUFͳϑΟʔϧυ͕એݴ͞ΕΔ WBMͷ৔߹HFUUFSͷΈੜ੒͞ΕΔ WBSͷ৔߹HFUUFSTFUUFS͕ੜ੒͞ΕΔ

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val id = product.id product.name = "meat"

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val id = product.id product.name = "meat" int id = product.getId(); product.setName("meat");

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w ϑΟʔϧυͱΞΫηαΛࣗಈੜ੒͢Δ w ϓϩύςΟΞΫηεΛΞΫηαݺͼग़͠ ʹม׵͢Δ w ಈ࡞ͱͯ͠͸MPNCPLʹ͍ۙɻݟͨ໨͸ ௚઀ΞΫηε͕ͩඞͣΞΫηαΛܦ༝͠ ͨݺͼग़͠ʹͳΔɻ͞ΒʹFRVBMT΍ IBTI$PEFΛ࣮૷ͯ͘͠ΕΔσʔλΫϥ εͳͲ͕͋Δ ϓϩύςΟ͕΍͍ͬͯΔ͜ͱ

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͜͜·Ͱͷ·ͱΊ

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w +BWBʹͯ͠ΈΔͱͦΜͳʹ೉͍͜͠ ͱ͸΍ͬͯͳ͍ w ͪΐͬͱͨ͠ίʔυͷੜ੒Λݞ୅ΘΓ ͢Δ͜ͱͰ؆ܿͳॻ͖ํΛखॿ͚ͯ͠ ͍Δ w ݴޠػೳΛશ෦ؚΊΔͱ͔ͳΓͷྔͷ ίʔυ͕࡟ݮͰ͖Δ͜ͱʹͳΔ ͜͜·Ͱͷ·ͱΊ

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ઃܭʹ༩͑ΔӨڹ

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OVMMڐ༰ܕ

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OVMMνΣοΫΛ௥Ճͯ͠ॲཧΛ εΩοϓͨ͠Γྫ֎Λεϩʔ͢ Δ͚ͩͷγϯϓϧͳߏ଄͚ͩͲ ͨͬͨͦΕ͚ͩͰઃܭʹӨڹ͕ ͋ΔΜͩΖ͏͔ʁ

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!/VMMBCMF !/PO/VMMΛ׆༻ ͨ͠ΓOVMMνΣοΫΛద੾ʹ࣮ ૷͢Ε͹͍͍͚ͩͰ͸ʁʁ

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fun semitransparent(view: View) { view.alpha = 0.5f } ؔ਺಺ͰWJFX͕ඇOVMMͰ͋Δ͜ͱΛอূ͢Δ

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fun semitransparent(view: View) { view.alpha = 0.5f } val text: View? = findViewById(R.id.text) semitransparent(text)

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fun semitransparent(view: View) { view.alpha = 0.5f } val text: View? = findViewById(R.id.text) semitransparent(text) 5ZQFNJTTNBUDIͰίϯύΠϧΤϥʔ

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fun semitransparent(view: View) { view.alpha = 0.5f } val text: View? = findViewById(R.id.text) semitransparent(text!!) ةݥͳݺͼग़͠ɻཁվળͷγάφϧ

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fun semitransparent(view: View) { view.alpha = 0.5f } val text: View? = findViewById(R.id.text) text?.let { semitransparent(it) } OVMM͡Όͳ͚Ε͹࣮ߦɻ

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fun semitransparent(view: View) { view.alpha = 0.5f } val text: View? = findViewById(R.id.text) text?.let { semitransparent(it) } OVMM͡Όͳ͚Ε͹࣮ߦɻ ͳΜ͔ͩ৑௕ͩ͠ɺͦ΋ͦ΋OVMMͷέʔε͸૝ఆͯ͠ͳ͍ͷͰ͸ʁ

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fun semitransparent(view: View) { view.alpha = 0.5f } val text: View? = findViewById(R.id.text) text?.let { semitransparent(it) } OVMM͡Όͳ͚Ε͹࣮ߦɻ ͳΜ͔ͩ৑௕ͩ͠ɺͦ΋ͦ΋OVMMͷέʔε͸૝ఆͯ͠ͳ͍ͷͰ͸ʁ %BUB#JOEJOH΍,PUMJO"OESPJE&YUFOTJPOTͷར༻Λݕ౼

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fun semitransparent(view: View) { view.alpha = 0.5f } semitransparent(binding.text) OVMMڐ༰ܕ͕ݱΕΔͱ͜ΖݮΒͦ͏ͱ͍ͯ͘͜͠ͱͰɺ OVMMʹରͯ҆͠શͳൣғ͕޿͕͍ͬͯ͘

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w OVMMʹؔ͢Δܖ໿ΛݴޠϨϕϧͰ୅ߦͯ͠ ͘ΕΔɻͦΕʹΑΓOVMMͷڥքͷઃܭʹू தͰ͖Δ w OVMMͷڥք͕ίʔυ্ͰՄࢹԽ͞ΕΔͷͰ ઃܭͷվળͷࡐྉʹͳΔ w ඇOVMMͷྖҬΛ޿͍͛ͯ͘͜ͱͰɺՄಡੑ ͱมߋ༰қੑ্͕͕ΓɺOVMM҆શͱͳΔ OVMMڐ༰ܕ͕ઃܭʹ༩͑ΔӨڹ

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֦ுؔ਺

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ͦΕͧΕͷؔ਺ͷ࣮૷ࣗମ͸౎ ౓͠ͳ͖Ό͍͚ͳ͍݁͠ہ੩త ؔ਺ͷݺͼग़͠Λஔ͖׵͑Δͩ ͚ͩ͠ҙຯ͋Δͷʁʁ

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੩తؔ਺ΛूΊͨ6UJMΫϥε܈ Λద੾ʹӡ༻͢Ε͹͍͍͚ͩͰ ͸ʁʁ

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val id = intent.getIntExtra("id", -1)

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val id = intent.getIntExtra("id", -1) ͜ͷ*OUFOUύϥϝʔλ͕ඞਢͳͷ͔Ͳ͏͔ ͔͜͜Β͸ಡΈऔΕͳ͍

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inline fun Intent.getRequired(key: String): T {
 extras?.get(key).let {
 if (it !is T) {
 throw IllegalArgumentException("$key")
 }
 return it
 } } LFZ͕ͳ͍৔߹ʹྫ֎Λεϩʔ͢Δɺ HFU3FRVJSFEؔ਺Λ*OUFOUʹ௥Ճ͢Δ

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val id:Int = intent.getRequired("id") *OUFOUࣗ਎ʹඞਢ஋ΛऔΓग़͢ͱ͍͏੹຿Λ ௥Ճ͢Δ͜ͱͰɺҙਤ͕໌շͳݺͼग़͕͠ՄೳʹͳΔ

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val id:Int = intent.getRequired("id") *OUFOUࣗ਎ʹඞਢ஋ΛऔΓग़͢ͱ͍͏੹຿Λ ௥Ճ͢Δ͜ͱͰɺҙਤ͕໌շͳݺͼग़͕͠ՄೳʹͳΔ

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w ର৅ͷΫϥε͕͓͍࣋ͬͯͨ΄͏͕Α͍ͱ ͔Μ͕͑ΒΕΔ੹຿Λɺ࣮ࡍʹର৅ͷΫ ϥεʹ࣋ͨͤΔ͜ͱ͕Ͱ͖Δɻ w طଘͷΫϥεΛ͋ͱ͔Β֦ுͰ͖ΔͷͰɺ ϓϥοτϑΥʔϜͷ౎߹ͰՄಡੑ͕٘ਜ਼ ʹͳΔΑ͏ͳՕॴΛআڈ͠ɺຊདྷ͋Δ΂ ͖࢟ͱߟ͑ΒΕΔঢ়ଶʹ͍͍͚ۙͮͯΔ ֦ுؔ਺͕ઃܭʹ༩͑ΔӨڹ

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w ,PUMJO͸+BWB w ϘΠϥʔϓϨʔτίʔυΛݴޠͷཪʹ Ӆ͢͜ͱͰɺຊ౰ʹ࡞Βͳ͚Ε͹͍͚ ͳ͍෦෼ʹूதͰ͖ΔΑ͏ʹͳͬͯΔ w OVMMͷڥքͷઃܭɺ੹຿ͷ௥ՃʹΑΔ Մಡੑ޲্ͳͲͳͲɺݴޠػೳ͕ιϑ τ΢ΣΞશମͷઃܭվળʹد༩͍ͯ͠ Δ શମͷ·ͱΊ

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-FU`TFOKPZ,PUMJO

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·ͩ·ͩ͋Δ,PUMJOͷػೳ w σϦήʔτϓϩύςΟ w ΦϖϨʔλΦʔόʔϩʔυ w ίϯύχΦϯΦϒδΣΫτ w γʔϧυΫϥε w XIFOࣜ w ίϧʔνϯ w λΠϓΤΠϦΞε w ۩৅Խ͞Εͨܕύϥϝʔλ w σʔλΫϥε w ໊લ෇͖Ҿ਺ w εϚʔτΩϟετ w ෼ղએݴ w ϩʔΧϧؔ਺ w ຤ඌ࠶ؼ࠷దԽ w MBUFJOJU w Πϯελϯεͷؔ਺ࢀর FUD

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͜ͷઌ͸܅ͷ໨Ͱ ͔֬Ίͯ͘Εʂ

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THANK YOU