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Google I/O 2018’s Extensions🦔
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Hunachi
September 20, 2018
Technology
1
2.3k
Google I/O 2018’s Extensions🦔
Kotlin大好き!Kotlin愛好会 vol4で発表しました.
是非Googleさんを参考にしましょう!
Hunachi
September 20, 2018
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Transcript
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// Listͱ͔ͰView͕ΨλϯͬͯͳͬͨΓ͢ΔͷΛ͙༻ɽ inline fun <T : ViewDataBinding> T.executeAfter(block: T.() ->Unit){
block() // ͙͢ʹbinding͍ͤͨ࣌͞ʹ͏ɽ executePendingBindings() } // ༻ྫ binding.executeAfter { //͜͜Ͱbind͢Δɽ event = item } ᶃ
// TransitionΛԆͤ͞Δ fun Activity.postponeEnterTransition(timeout: Long) { postponeEnterTransition() window.decorView.postDelayed(timeout) { startPostponedEnterTransition()
} } // ༻ྫ activity?.postponeEnterTransition(500L) ᶄ
// ॳظԽɼࢀর͕ৗʹγϯάϧεϨουͰ͔͠ߦΘΕͳ͍࣌༻ɽ fun <T> lazyFast(operation: () -> T): Lazy<T> =
lazy(LazyThreadSafetyMode.NONE) { operation() } // SYNCRONIZED: σϑΥϧτɽ୯ҰεϨου͔ΒͷॳظԽͰɼෳεϨου͔Βͷࢀর͕Մೳɽ // PUBLICATION: ෳεϨου͔ΒॳظԽ͠Α͏ͱ͢Δࣄ͕Մೳɽ // ༻ྫ private val day: Int by lazyFast { val args = arguments ?: throw IllegalStateException("Missing arguments!") args.getInt(ARG_INT) } ᶅ
inline fun <reified VM : ViewModel> FragmentActivity.viewModelProvider( provider: ViewModelProvider.Factory )
= ViewModelProviders.of(this, provider).get(VM::class.java) // ༻ྫ // Before val viewModel: HogeViewModel = ViewModelProviders.of(this, viewModelFactory) .get(HogeViewModel::class.java) //After val viewModel: HogeViewModel = viewModelProvider(viewModelFactory) ᶆ
fun ViewGroup.inflate( @LayoutRes layout: Int, attachToRoot: Boolean = false ):
View { return LayoutInflater.from(context) .inflate(layout, this, attachToRoot) } // ༻ྫ … Holder( parent.inflate(VIEW_TYPE_HEADING, false) ) ᶇ
inline fun FragmentManager.inTransaction( func: FragmentTransaction.() -> FragmentTransaction ) { beginTransaction().func().commit()
} // ༻ྫ supportFragmentManager.inTransaction { add(FRAGMENT_ID, fragment) } ᶈ
// enumΫϥεΛbundleʹೖΕΕΔܗʹ͢Δ fun <T : Enum<T>> Bundle.putEnum(key: String, value: T)
= putString(key, value.name) // ↑ͰೖΕͨenumΫϥεΛऔΓग़͢ inline fun <reified T : Enum<T>> Bundle.getEnum(key: String): T = enumValueOf(getString(key)) // ParcelʹbooleanΛॻ͖ࠐΉ fun Parcel.writeBoolean(value: Boolean) = writeInt(if (value) 1 else 0) // ↑Ͱมͨ͠booleanΛಡΈࠐΉ fun Parcel.readBoolean() = readInt() != 0 ᶉ
// ༻ྫ // ಡΈ͍͢ʂ pacel.apply { writeInt(state) writeInt(peekHeight) writeBoolean(isFitToContents) writeBoolean(isHideable)
writeBoolean(skipCollapsed) writeBoolean(isDraggable) }
fun <T> MutableLiveData<T>.setValueIfNew(newValue: T) { if (this.value != newValue) value
= newValue } fun <T> MutableLiveData<T>.postValueIfNew(newValue: T) { if (this.value != newValue) postValue(newValue) } // ObserverଆͰఆͨ͠ํ͕҆શͳؾ͕͢Δ͚ͲͲ͏ͳΜͩΖ͏ɽɽ ᶊ
fun <X, Y> LiveData<X>.map(body: (X) -> Y): LiveData<Y> { return
Transformations.map(this, body) } fun <X, Y> LiveData<X>.switchMap(body: (X) -> LiveData<Y>): LiveData<Y> { return Transformations.switchMap(this, body) } ᶋ
// ༻ྫ liveData = parentLiveData.map { (it as? Result.Success)?.data?: 0
} liveData = parentLiveData.switchMap { if(value == null) dataLiveData else parentLiveData } // ࠷ॳ֦ுؔͬͯࣄʹؾ͔ͮͣɼڻ͍ͨɽ
val <T> T.checkAllMatched: T get() = this // ༻ྫ //
OK when (sealed) { ONE -> {…} TWO -> {…} }.checkAllMatch // error when (sealed) { ONE -> {…} //TWO -> {…} }.checkAllMatch ᶌ
w ஸೡʂ ͜ͷ࣮७ਮʹ಄ ͍͍ͱࢥ͏ɽ
5IBOLZPV ,PUMJOՄѪ͍ʂ