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Inside Android KTX

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Rob

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Such magic Much tech NOPE

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animator = ObjectAnimator.ofFloat(view, View.ALPHA, 0f, 1f)

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animator = ObjectAnimator.ofFloat(view, View.ALPHA, 0f, 1f) animator.doOnStartT{ ... }T animator.doOnEndT{ ... }T animator.doOnCancelT{ ... }T animator.doOnRepeatT{ ... }T animator.doOnPauseT{ ... }T animator.doOnResumeT{ ... }T

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animatorT= ObjectAnimator.ofFloat(view, View.ALPHA, 0f, 1f) animator.doOnStartT{ ... }T animator.doOnEndT{ ... }T animator.doOnCancelT{ ... }T animator.doOnRepeatT{ ... }T animator.doOnPauseT{ ... }T animator.doOnResumeT{ ... }T Animator.doOnStart

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funTAnimator.doOnStart(action:T(anim:JAnimator)T->KUnit) T= addListener(onStartT=Taction) animator.doOnStartT{ ... }

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fun Animator.addListener(T onEnd:T((animator:TAnimator)T->TUnit)?T=Tnull,T onStart:T((animator:TAnimator)T-> Unit)?T=Tnull,T onCancel:T((animator:TAnimator)T-> Unit)?T=Tnull,T onRepeat:T((animator:TAnimator)T-> Unit)?T=TnullT ):TAnimator.AnimatorListenerT{T valTlistenerT=TobjectT:TAnimator.AnimatorListenerT{TT overrideTfunTonAnimationRepeat(animator:TAnimator)T{T onRepeat?.invoke(animator) }T overrideTfunTonAnimationEnd(animator:TAnimator)T{T onEnd?.invoke(animator) }T overrideTfunTonAnimationCancel(animator:TAnimator)T{T onCancel?.invoke(animator) }T overrideTfunTonAnimationStart(animator:TAnimator)T{T onStart?.invoke(animator)

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onRepeat:T((animator:TAnimator)T-> Unit)?T=TnullT ):TAnimator.AnimatorListenerT{T valTlistenerT=TobjectT:TAnimator.AnimatorListenerT{TT overrideTfunTonAnimationRepeat(animator:TAnimator)T{T onRepeat?.invoke(animator) }T overrideTfunTonAnimationEnd(animator:TAnimator)T{T onEnd?.invoke(animator) }T overrideTfunTonAnimationCancel(animator:TAnimator)T{T onCancel?.invoke(animator) }T overrideTfunTonAnimationStart(animator:TAnimator)T{T onStart?.invoke(animator) }T }T addListener(listener) returnTlistener }T

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fun Animator.addListener(T onEnd:T((animator:TAnimator)T->TUnit)?T=Tnull,T onStart:T((animator:TAnimator)T-> Unit)?T=Tnull,T onCancel:T((animator:TAnimator)T-> Unit)?T=Tnull,T onRepeat:T((animator:TAnimator)T-> Unit)?T=TnullT ):TAnimator.AnimatorListenerT{T valTlistenerT=TobjectT:TAnimator.AnimatorListenerT{TT overrideTfunTonAnimationRepeat(animator:TAnimator)T{T onRepeat?.invoke(animator) }T overrideTfunTonAnimationEnd(animator:TAnimator)T{T onEnd?.invoke(animator) }T overrideTfunTonAnimationCancel(animator:TAnimator)T{T onCancel?.invoke(animator) }T overrideTfunTonAnimationStart(animator:TAnimator)T{T onStart?.invoke(animator) }T }T addListener(listener) returnTlistener }T

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val actual = context.systemService()

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val actual = context.systemService() @RequiresApi(23) inline fun Context.systemService() = getSystemService(T::class.java)

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val actual = context.systemService() @RequiresApi(23) inline fun Context.systemService() = getSystemService(T::class.java)

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val actual = context.systemService() @RequiresApi(23) inline fun Context.systemService() = getSystemService(T::class.java)

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val actual = context.systemService() @RequiresApi(23) inline fun Context.systemService() = getSystemService(T::class.java) inline reified

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inline reified Body is copied over at compile time Type passed is preserved

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inline reified Body is copied over at compile time Type passed is preserved

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inline reified Body is copied over at compile time Type passed is preserved

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context.withStyledAttributes(T ... intArrayOf(android.R.attr.textColorPrimary) )T{ val resourceId = getResourceId(0, -1) ... }T context.withStyledAttributes(

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context.withStyledAttributes(…){…}T context.withStyledAttributes( inline fun Context.withStyledAttributes( ... attrs: IntArray, ... block: TypedArray.() -> Unit ) { val typedArray = obtainStyledAttributes(...) try { typedArray.block() } finally { typedArray.recycle() } }

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inline fun Context.withStyledAttributes( ... attrs: IntArray, ... block: TypedArray.() -> Unit ) { val typedArray = obtainStyledAttributes(...) try { typedArray.block() } finally { typedArray.recycle() } } context.withStyledAttributes(…){…}T context.withStyledAttributes(

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valT(a,Tr,Tg,Tb)T=T0x337f3010

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valT(a,Tr,Tg,Tb)T=T0x337f3010

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valT(a,Tr,Tg,Tb)T=T0x337f3010

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valT(a,Tr,Tg,Tb)T=T0x337f3010

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valT(a,Tr,Tg,Tb)T=T0x337f3010

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valT(a,Tr,Tg,Tb)T=T0x337f3010

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inline operator fun @receiver:ColorInt Int.component1() = (this shr 24) and 0xff inline operator fun @receiver:ColorInt Int.component2() = (this shr 16) and 0xff inline operator fun @receiver:ColorInt Int.component3() = (this shr 8) and 0xff inline operator fun @receiver:ColorInt Int.component4() = this and 0xff valT(a,Tr,Tg,Tb)T=T0x337f3010

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inline operator fun @receiver:ColorInt Int.component1() = (this shr 24) and 0xff inline operator fun @receiver:ColorInt Int.component2() = (this shr 16) and 0xff inline operator fun @receiver:ColorInt Int.component3() = (this shr 8) and 0xff inline operator fun @receiver:ColorInt Int.component4() = this and 0xff valT(a,Tr,Tg,Tb)T=T0x337f3010

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inline operator fun @receiver:ColorInt Int.component1() = (this shr 24) and 0xff inline operator fun @receiver:ColorInt Int.component2() = (this shr 16) and 0xff inline operator fun @receiver:ColorInt Int.component3() = (this shr 8) and 0xff inline operator fun @receiver:ColorInt Int.component4() = this and 0xff valT(a,Tr,Tg,Tb)T=T0x337f3010

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inline operator fun @receiver:ColorInt Int.component1() = (this shr 24) and 0xff inline operator fun @receiver:ColorInt Int.component2() = (this shr 16) and 0xff inline operator fun @receiver:ColorInt Int.component3() = (this shr 8) and 0xff inline operator fun @receiver:ColorInt Int.component4() = this and 0xff valT(a,Tr,Tg,Tb)T=T0x337f3010

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inline operator fun @receiver:ColorInt Int.component1() = (this shr 24) and 0xff inline operator fun @receiver:ColorInt Int.component2() = (this shr 16) and 0xff inline operator fun @receiver:ColorInt Int.component3() = (this shr 8) and 0xff inline operator fun @receiver:ColorInt Int.component4() = this and 0xff valT(a,Tr,Tg,Tb)T=T0x337f3010

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valT(a,Tr,Tg,Tb)T=T0x337f3010 inline operator fun @receiver:ColorInt Int.component1()T= (thisTshrT24)TandT0xff inline operator fun @receiver:ColorInt Int.component2()T= (thisTshrT16)TandT0xff inline operator fun @receiver:ColorInt Int.component3()T= (thisTshrT8)TandT0xff inline operator fun @receiver:ColorInt Int.component4()T= thisTandT0xff

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valT(a,Tr,Tg,Tb)T=T0x337f3010 operatorTfun Int.component1()T= (thisTshrT24)TandT0xff operatorTfun Int.component2()T= (thisTshrT16)TandT0xff operatorTfun Int.component3()T= (thisTshrT8)TandT0xff operatorTfun Int.component4()T= thisTandT0xff

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valT(a,Tr,Tg,Tb)T=T0x337f3010 operatorTfun Int.component1() = (thisTshrT24) and 0xff operatorTfun Int.component2()T= (thisTshrT16)TandT0xff operatorTfun Int.component3()T= (thisTshrT8)TandT0xff operatorTfun Int.component4()T= thisTandT0xff

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valT(a,Tr,Tg,Tb)T=T0x337f3010 operatorTfun Int.component1() = (this shr 24) and 0xff 0x337f3010.alpha val Int.alpha get() = (this shr 24) and 0xff

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valT(a,Tr,Tg,Tb)T=T0x337f3010 operatorTfun Int.component1() = (this shr 24) and 0xff 0x337f3010.alpha val Int.alpha get() = (this shr 24) and 0xff

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valT(a,Tr,Tg,Tb)T=T0x337f3010 operatorTfun Int.component1() = (this shr 24) and 0xff 0x337f3010.alpha val Int.alpha get() = (this shr 24) and 0xff

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val path = path1 + path2

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val path = path1 + path2 inline operator fun Path.plus(p: Path): Path = Path(this).apply { op(p, Path.Op.UNION) }

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val path = path1 + path2 val path = path1 and path2

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val path = path1 + path2 val path = path1 and path2 inline infix fun Path.and(p: Path) = this + p

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varTcalledT=T0T handler.postDelayed(10)T{T called++ }T Outer scope

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varTcalledT=T0T handler.postDelayed(10)T{T called++ }T inline fun Handler.postDelayed( crossinline action: () -> Unit) = Runnable { action() }

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varTcalledT=T0T handler.postDelayed(10)T{T called++ }T inline fun Handler.postDelayed( crossinline action: () -> Unit) = Runnable { action() } fun foo() { ordinaryFunction { return } } ❌

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varTcalledT=T0T handler.postDelayed(10)T{T called++ }T inline fun Handler.postDelayed( crossinline action: () -> Unit) = Runnable { action() } fun foo() { ordinaryFunction { return@ordinaryFunction } }

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varTcalledT=T0T handler.postDelayed(10)T{T called++ }T inline fun Handler.postDelayed( crossinline action: () -> Unit) = Runnable { action() } fun foo() { ordinaryFunction f1@{ return@f1 } }

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varTcalledT=T0T handler.postDelayed(10)T{T called++ }T inline fun Handler.postDelayed( crossinline action: () -> Unit) = Runnable { action() } fun foo() { inlineFunction { return } } ✅

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varTcalledT=T0T handler.postDelayed(10)T{T called++ }T inline fun Handler.postDelayed( crossinline action: () -> Unit) = Runnable { action() } fun hasZeros(ints: List): Boolean { ints.forEach { if (it == 0) return true } return false }

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varTcalledT=T0T handler.postDelayed(10)T{T called++ }T inline fun Handler.postDelayed( crossinline action: () -> Unit) = Runnable { action() }

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fun f1()T{T f2 {T return //ERROR return@f2 }T f3 {T return //f1 return@f3 }T f4 {T return //ERROR return@f4 }T }T

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fun f2(f: ()T-> Unit) inline fun f3(f: ()T-> Unit) inline fun f4(crossinline f: ()T-> Unit) fun f1()T{T f2 {T return //ERROR return@f2 }T f3 {T return //f1 return@f3 }T f4 {T return //ERROR return@f4 }T }T

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fun f2(f: ()T-> Unit) inline fun f3(f: ()T-> Unit) inline fun f4(crossinline f: ()T-> Unit) fun f1()T{T f2 {T return //ERROR return@f2 }T f3 {T return //f1 return@f3 }T f4 {T return //ERROR return@f4 }T }T

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fun f2(f: ()T-> Unit) inline fun f3(f: ()T-> Unit) inline fun f4(crossinline f: ()T-> Unit) fun f1()T{T f2 {T return //ERROR return@f2 }T f3 {T return //f1 return@f3 }T f4 {T return //ERROR return@f4 }T }T

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funTshow(v:TView)T{T v.animate()T .setDuration(200)T .alphaBy(0f)T .alpha(1f)T .start()T }T

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funTView.show()T{T animate()T .setDuration(200)T .alphaBy(0f)T .alpha(1f)T .start()T }T

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funTView.show()T{T animate()T .setDuration(200)T .alphaBy(0f)T .alpha(1f)T .start()T }T funTView.hide()T{T animate()T .setDuration(200)T .alphaBy(1f)T .alpha(0f)T .start()T }T

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funTView.show()T{T animate()T .setDuration(200)T .alphaBy(0f)T .alpha(1f)T .start()T }T funTView.hide()T{T animate()T .setDuration(200)T .alphaBy(1f)T .alpha(0f)T .start()T }T

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fun View.update(T callback: ViewPropertyAnimator.()T->TViewPropertyAnimator )T{T animate()T .setDuration(200)T .callback()T .start()T }T

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fun View.update(T callback: ViewPropertyAnimator.()T->TViewPropertyAnimator )T{T animate()T .setDuration(200)T .callback()T .start()T }T

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funTView.update(T callback: ViewPropertyAnimator.()T->TViewPropertyAnimator )T{T animate()T .setDuration(200)T .callback()T .start()T }T fun View.show() { update { alphaBy(0f) .alpha(1f) } } funTView.hide()T{T updateT{T scaleXBy(1f) .scaleYBy(1f) .scaleX(0f) .scaleY(0f) }T }T

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funTView.update(T callback: ViewPropertyAnimator.()T->TViewPropertyAnimator )T{T animate()T .setDuration(200)T .callback()T .start()T }T fun View.show() { update { alphaBy(0f) .alpha(1f) } } funTView.hide()T{T updateT{T scaleXBy(1f) .scaleYBy(1f) .scaleX(0f) .scaleY(0f) }T }T

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open.nytimes.com @nytdev github.com/NYTimes developers.nytimes.com

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QA & speakerdeck.com/tiwiz/inside-android-ktx