Aidan Follestad afollestad

Staff L6 Android Engineer @square / @block 🧑‍💻 Apple fan 📱 Motorcycle and EV enthusiast 🏍️ Gamer 🎮

afollestad / ViewLifecycleOwner.kt

Created December 14, 2018 18:49

Create a lifecycle owner for a view without any boiler plate

	import android.view.View
	import android.view.View.OnAttachStateChangeListener
	import androidx.lifecycle.LifecycleOwner

	/** @author Aidan Follestad (@afollestad) */
	class ViewLifecycleOwner(view: View) : LifecycleOwner, OnAttachStateChangeListener {

	private val lifecycle = SimpleLifecycle(this)

	init {

afollestad / LivedataMap.kt

Created December 14, 2018 18:55

Map and switchMap live data with extension functions instead of method calls.

	import androidx.lifecycle.LiveData
	import androidx.lifecycle.Transformations

	fun <X, Y> LiveData<X>.map(mapper: (X) -> Y) =
	Transformations.map(this, mapper)!!

	fun <X, Y> LiveData<X>.switchMap(mapper: (X) -> LiveData<Y>) =
	Transformations.switchMap(this, mapper)!!

afollestad / LifecycleAwareDisposable.kt

Created December 14, 2018 19:09

Make an Observable Lifecycle aware - disposing itself when the lifecycle stops

	/** @author Aidan Follestad (afollestad) */
	class LifecycleAwareDisposable(
	private val disposable: Disposable
	) : LifecycleObserver {

	@OnLifecycleEvent(ON_DESTROY)
	fun dispose() = disposable.dispose()
	}

	/** @author Aidan Follestad (afollestad) */

afollestad / TextChangedExtension.kt

Created December 14, 2018 19:17

	import android.text.Editable
	import android.text.TextWatcher
	import android.widget.EditText

	fun EditText.onTextChanged(
	@IntRange(from = 0, to = 10000) debounce: Int = 0,
	cb: (String) -> Unit
	) {
	addTextChangedListener(object : TextWatcher {
	val callbackRunner = Runnable {

afollestad / gist:e1ada7b0c1d3a390e4b97910846cba69

Created April 19, 2019 00:10

List of components that can be installed on Travis.ci

afollestad / Debouncer.kt

Created June 12, 2019 18:08

Debounce clicks in Kotlin

	import android.view.View

	internal object Debouncer {
	@Volatile private var enabled: Boolean = true
	private val enableAgain = Runnable { enabled = true }

	fun canPerform(view: View): Boolean {
	if (enabled) {
	enabled = false
	view.post(enableAgain)

afollestad / TypefaceHelper.kt

Created June 19, 2019 21:46

	import android.graphics.Typeface
	import androidx.annotation.CheckResult
	import java.lang.Exception

	/** @author Aidan Follestad (@afollestad) */
	object TypefaceHelper {
	private val cache = hashMapOf<String, Typeface>()

	/**
	* Gets a typeface by its family name. Automatically statically caches it to avoid

afollestad / CommandLineParser.kt

Created November 25, 2019 17:19

	class CommandLineParser(
	private val input: String
	) : Iterator<String> {
	private var lastIndex: Int = 0

	override fun hasNext(): Boolean = lastIndex in 0..input.length - 2

	override fun next(): String {
	val value = StringBuilder()
	var quoteStarter: Char? = null

afollestad / IntervalFlow.kt

Created January 30, 2020 22:25

	import kotlinx.coroutines.*
	import kotlinx.coroutines.flow.Flow
	import kotlinx.coroutines.flow.channelFlow
	import kotlinx.coroutines.flow.launchIn
	import kotlinx.coroutines.flow.onEach

	@FlowPreview
	@ExperimentalCoroutinesApi
	fun main() {
	runBlocking {

afollestad / TestCollector.kt

Created February 1, 2020 04:21

	@file:Suppress("unused", "MemberVisibilityCanBePrivate")

	package com.afollestad.flow.util

	import com.google.common.truth.Truth.assertThat
	import com.google.common.truth.Truth.assertWithMessage
	import kotlinx.coroutines.CoroutineScope
	import kotlinx.coroutines.Dispatchers.Unconfined
	import kotlinx.coroutines.ExperimentalCoroutinesApi
	import kotlinx.coroutines.Job