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class MainActivity : AppCompatActivity() {

    private val viewModel: MainViewModel by viewModels()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val splashScreen = installSplashScreen() // ★ SplashScreenを適用
        setContentView(R.layout.activity_main)

        splashScreen.setKeepVisibleCondition {　 // ★　ここでtrueを返してる間はSplashScreenが表示されたまま

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fun ConcatAdapter.findAdapter(position: Int): RecyclerView.Adapter<*>? {
    var totalCount = 0
    adapters.forEach { adapter ->
        totalCount += adapter.itemCount
        if (position < totalCount) {
            return adapter
        }
    }
    return null
}

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#!/bin/sh
dir=$(dirname $0)
java -jar "$dir/bundletool-all-0.3.3.jar" $@

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def supportLibraryVersion = '27.1.1'

android {
    // ...
    defaultConfig {
        // ...

        multiDexEnabled true
    }
    

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task searchCompileDependencies() {
    doLast {
        configurations.find { it.name == 'compile' }?.dependencies?.each {
            println "$it.group:$it.name"
        }
    }
}

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<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_anchor="@id/toolbar"
    tools:context=".MainActivity">

    <android.support.design.widget.AppBarLayout

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def robolectricDependenciesFolder = project.rootDir.path + "/.robolectric-dependencies"

configurations.create('robolectricRuntime')

dependencies {
    robolectricRuntime "org.robolectric:android-all:o-preview-4-robolectric-0"
}

rootProject.task(type: Copy, overwrite: true, "downloadRobolectricDependencies") {
    from configurations.robolectricRuntime

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// compile "org.jetbrains.kotlinx:kotlinx-coroutines-android:0.16"
// compile "android.arch.lifecycle:runtime:1.0.0-alpha3"
// compile "android.arch.lifecycle:extensions:1.0.0-alpha3"
// kapt "android.arch.lifecycle:compiler:1.0.0-alpha3"

class AsyncLiveData<T> private constructor(private val exec: suspend () -> T) : LiveData<T>() {

    private var observer: Observer<T>? = null

    private var job: Job? = null

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class Test: SequenceType {
    typealias Generator = IndexingGenerator<[String]>
    
    func generate() -> Generator {
        return ["A", "B", "C"].generate()
    }
}

let test = Test()
for t in test {

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func foo() -> String? {
    return nil
}

let hoge: String
if let t = foo() {
    // nilじゃなければ、その値を使いたい
    hoge = t
} else {
    // nilだったらデフォルト設定したい