sys1yagi

// in Activity
override fun onCreate(savedInstanceState: Bundle?) {
  super.onCreate(savedInstanceState)  
  lifecycleScope.launchWhenCreated {
      editNickName.textChangeAsFlow()
        .map { it?.isNotEmpty() ?: false }
        .collect {
            sendButton.isEnabled = it
        }
}

sys1yagi

// deprecatedだけど新しいのは API 23からなので仕方ない
val intent = AccountManager.newChooseAccountIntent(
  null, 
  null, 
  arrayOf("com.google"),
  true, 
  null, 
  null, 
  null, 
  null

sys1yagi

fun delay(delayTime: Long, stateMachine: StateMachine) {
    Thread.sleep(delayTime)
    stateMachine.resume()
}

class StateMachine {
    var state = 0
    var start = 0L
    fun resume() {
        when (state) {

sys1yagi

import android.app.IntentService
import android.content.Context
import android.content.Intent
import android.os.Bundle
import androidx.work.Data
import androidx.work.OneTimeWorkRequest
import androidx.work.WorkManager
import androidx.work.Worker

sys1yagi

import android.text.Editable
import android.text.TextWatcher
import android.widget.EditText
import kotlinx.coroutines.experimental.channels.Channel
import kotlinx.coroutines.experimental.channels.ReceiveChannel
import kotlinx.coroutines.experimental.channels.sendBlocking
import kotlinx.coroutines.experimental.launch

object EditTextChannel {
    fun empty(editText: EditText): ReceiveChannel<Boolean> = ConflatedChannel<Boolean>().apply {

sys1yagi

class StateLiveData<T> : MutableLiveData<T>() {
    override fun onInactive() {
        super.onInactive()
        value = null
    }
}

sys1yagi

class Value(val value: Int, var output: String = "")

fun rule(seed: Int, print: String, next: SendChannel<Value>) = actor<Value> {
    for (value in channel) {
        next.send(value.apply {
            if (value.value % seed == 0) {
                this.output += print
            }
        })
    }

sys1yagi

fun shouldOpenShop(shopId: Long): Boolean {
  if( shopId <= 0L ){
     return false 
  }
  if( this.shop == null ) {
     return false 
  }
  if( this.shop.id == shopId ) { // これを return this.shop.id == shopId にしろって言われる
     return false 
  }

sys1yagi

fun <T> async(context: CoroutineContext = CommonPool, start: CoroutineStart = CoroutineStart.DEFAULT, block: suspend CoroutineScope.() -> T)
        = kotlinx.coroutines.experimental.async(context, start, block)

fun ui(start: CoroutineStart = CoroutineStart.DEFAULT, block: suspend CoroutineScope.() -> Unit)
        = launch(UI, start, block)

suspend fun <T, U> parallel(c1: suspend CoroutineScope.() -> T, c2: suspend CoroutineScope.() -> U): Pair<T, U> {
    val c1Job = async(block = c1)
    val c2Job = async(block = c2)
    return Pair(c1Job.await(), c2Job.await())

sys1yagi

@startuml

start

if (Have an access token?) then (yes)
else (no)
  if (Have an refresh token?) then (yes)
    while (Request access token) is (error)
 if (retry?) then (yes)