On a mission to be blazingly fast

Long Vu longv

On a mission to be blazingly fast

longv / LifecycleAwareLazy.kt

Created February 11, 2021 12:34

Lifecycle-aware Lazy

	fun <T> LifecycleOwner.lifecycleAwareLazy(initializer: () -> T): Lazy<T> = LifecycleAwareLazy(this, initializer)

	private object UninitializedValue

	class LifecycleAwareLazy<out T>(
	private val owner: LifecycleOwner,
	initializer: () -> T
	) : Lazy<T>, Serializable, LifecycleObserver {

	private var initializer: (() -> T)? = initializer

longv / BindingAdapterInAction.kt

Created February 1, 2021 22:50

	class MainActivity {

	// ...

	private val viewModel by viewModels { viewModelFactory }

	private lateinit var adapter: DataBindingAdapter

	override fun onCreate(savedInstanceState: Bundle?) {
	super.onCreate(savedInstanceState)

longv / SubscribeOnExample4.kt

Last active February 1, 2021 22:35

	fun debugSubscribeOn(): Disposable =
	Observable.just(1)
	.doOnNext {
	println(Thread.currentThread().name) // RxCachedThreadScheduler-1
	}
	.subscribeOn(Schedulers.io())
	.flatMap {
	println(Thread.currentThread().name) // RxCachedThreadScheduler-1
	Observable.just(it)
	.doOnNext {

longv / SubscribeOnExample3.kt

Last active February 1, 2021 22:32

	fun debugSubscribeOn(): Disposable =
	Observable.just(1)
	.doOnNext {
	println(Thread.currentThread().name) // RxCachedThreadScheduler-1
	}
	.subscribeOn(Schedulers.io())
	.flatMap {
	println(Thread.currentThread().name) // RxCachedThreadScheduler-1
	Observable.just(it)
	.subscribeOn(Schedulers.computation())

longv / SubscribeOnExample2.kt

Last active February 1, 2021 22:36

	fun debugSubscribeOn(): Disposable =
	Observable.just(1, 2, 3)
	.doOnNext {
	println(Thread.currentThread().name) // RxCachedThreadScheduler-1
	}
	.subscribeOn(Schedulers.io())
	.subscribeOn(Schedulers.computation())
	.doOnNext {
	println(Thread.currentThread().name) // RxCachedThreadScheduler-1
	}

longv / SubscribeOnExample1.kt

Last active February 1, 2021 22:37

	fun debugSubscribeOn(): Disposable =
	Observable.just(1, 2, 3)
	.doOnNext {
	println(Thread.currentThread().name) // RxCachedThreadScheduler-1
	}
	.subscribeOn(Schedulers.io())
	.doOnNext {
	println(Thread.currentThread().name) // RxCachedThreadScheduler-1
	}
	.subscribe()

longv / main_item_list.xml

Created November 3, 2019 09:42

Usage of model attribute in data binding RecyclerView

	<?xml version="1.0" encoding="utf-8"?>
	<layout
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:tools="http://schemas.android.com/tools"
	xmlns:app="http://schemas.android.com/apk/res-auto">
	<data>
	<variable
	name="listModel"
	type="androidx.lifecycle.LiveData<me.longv.pokedex.databinding.RecyclerViewModel>"/>
	</data>

longv / BindingAdapters.kt

Created November 3, 2019 09:32

Binding attributes for data binding RecyclerView

	package me.longv.pokedex.databinding

	import androidx.databinding.BindingAdapter
	import androidx.recyclerview.widget.RecyclerView

	@BindingAdapter(value = ["model"])
	fun setupRecyclerView(view: RecyclerView, model: RecyclerViewModel?) {
	model?.apply {
	view.adapter = DataBindingAdapter(bindingEntries)
	view.layoutManager = layoutManager

longv / DataBindingAdapter.kt

Last active February 1, 2021 22:52

DataBindingAdapter for data binding RecyclerView

	class DataBindingAdapter(private var bindingEntries: List<DataBindingEntry> = emptyList())
	: RecyclerView.Adapter<DataBindingViewHolder>() {

	override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DataBindingViewHolder {
	val layoutInflater = LayoutInflater.from(parent.context)
	val viewBinding = DataBindingUtil.inflate<ViewDataBinding>(layoutInflater, viewType, parent, false)
	return DataBindingViewHolder(viewBinding)
	}

	override fun onBindViewHolder(holder: DataBindingViewHolder, position: Int) {

longv / DataBindingViewHolder.kt

Last active February 1, 2021 22:28

DataBindingViewHolder for data binding RecyclerView

	class DataBindingViewHolder(private val viewBinding: ViewDataBinding): RecyclerView.ViewHolder(viewBinding.root) {

	fun bind(bindingEntry: DataBindingEntry) {
	viewBinding.apply {
	bindingEntry.bindings.forEach { setVariable(it.key, it.value) }
	}
	}
	}