diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..637a9a1
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+.*
+*.iml
+/captures
+/local.properties
+
+build/
diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
new file mode 100644
index 0000000..f9655c9
--- /dev/null
+++ b/.idea/codeStyles/Project.xml
@@ -0,0 +1,254 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
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+
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+
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+
+
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+
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+
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+
+
+
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+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ xmlns:android
+ ^$
+
+
+
+
+
+
+
+
+ xmlns:.*
+ ^$
+
+
+ BY_NAME
+
+
+
+
+
+
+ .*:id
+ http://schemas.android.com/apk/res/android
+
+
+
+
+
+
+
+
+ .*:name
+ http://schemas.android.com/apk/res/android
+
+
+
+
+
+
+
+
+ name
+ ^$
+
+
+
+
+
+
+
+
+ style
+ ^$
+
+
+
+
+
+
+
+
+ .*
+ ^$
+
+
+ BY_NAME
+
+
+
+
+
+
+ .*:layout_width
+ http://schemas.android.com/apk/res/android
+
+
+
+
+
+
+
+
+ .*:layout_height
+ http://schemas.android.com/apk/res/android
+
+
+
+
+
+
+
+
+ .*:layout_margin.*
+ http://schemas.android.com/apk/res/android
+
+
+ BY_NAME
+
+
+
+
+
+
+ .*:layout_.*
+ http://schemas.android.com/apk/res/android
+
+
+ BY_NAME
+
+
+
+
+
+
+ .*:width
+ http://schemas.android.com/apk/res/android
+
+
+ BY_NAME
+
+
+
+
+
+
+ .*:height
+ http://schemas.android.com/apk/res/android
+
+
+ BY_NAME
+
+
+
+
+
+
+ .*
+ http://schemas.android.com/apk/res/android
+
+
+ BY_NAME
+
+
+
+
+
+
+ .*
+ .*
+
+
+ BY_NAME
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/codeStyles/codeStyleConfig.xml b/.idea/codeStyles/codeStyleConfig.xml
new file mode 100644
index 0000000..79ee123
--- /dev/null
+++ b/.idea/codeStyles/codeStyleConfig.xml
@@ -0,0 +1,5 @@
+
+
+
+
+
\ No newline at end of file
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..423217d
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,2 @@
+teams:
+- Core Android
diff --git a/app.gradle b/app.gradle
new file mode 100644
index 0000000..1a25706
--- /dev/null
+++ b/app.gradle
@@ -0,0 +1,39 @@
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+
+android {
+ compileSdkVersion 27
+ defaultConfig {
+ minSdkVersion 21
+ targetSdkVersion 27
+ versionCode 1
+ versionName "1.0"
+
+ testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+
+ }
+
+ buildTypes {
+ release {
+ minifyEnabled false
+ }
+ }
+
+}
+
+
+dependencies {
+ implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+ implementation"org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
+ implementation 'com.android.support:appcompat-v7:27.1.1'
+ implementation "io.reactivex.rxjava2:rxjava:2.1.13"
+ implementation "com.google.guava:guava:25.0-android"
+
+ testImplementation 'junit:junit:4.12'
+ testImplementation 'org.mockito:mockito-inline:2.18.3'
+
+ androidTestImplementation 'org.mockito:mockito-android:2.18.3'
+ androidTestImplementation 'com.android.support.test:runner:1.0.2'
+ androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+}
diff --git a/app/build.gradle b/app/build.gradle
new file mode 100644
index 0000000..e83ea7d
--- /dev/null
+++ b/app/build.gradle
@@ -0,0 +1,7 @@
+apply from:'../app.gradle'
+
+android {
+ defaultConfig {
+ applicationId "demo.my.myapplication"
+ }
+}
diff --git a/app/constructors.kts b/app/constructors.kts
new file mode 100644
index 0000000..5b32f5c
--- /dev/null
+++ b/app/constructors.kts
@@ -0,0 +1,33 @@
+open class Parent(arg: Unit = println("Parent primary default argument")) {
+ private val a = println("Parent.a")
+
+ init {
+ println("Parent.init")
+ }
+
+ constructor(arg: Int, arg2: Unit = println("Parent secondary default argument")) : this() {
+ println("Parent secondary constructor")
+ }
+
+ private val b = println("Parent.b")
+}
+
+class Child(arg: Unit = println("Child primary default argument")) : Parent(2) {
+ val a = println("Child.a")
+
+ init {
+ println("Child.init 1")
+ }
+
+ val b = println("Child.b")
+
+ constructor(arg: Int, arg2: Unit = println("Child secondary default argument")) : this() {
+ println("Child secondary constructor")
+ }
+
+ init {
+ println("Child.init 2")
+ }
+}
+
+Child(2)
\ No newline at end of file
diff --git a/app/delegates.kts b/app/delegates.kts
new file mode 100644
index 0000000..298d304
--- /dev/null
+++ b/app/delegates.kts
@@ -0,0 +1,19 @@
+open class BackedByMap {
+ protected val _map = mutableMapOf()
+ val map get() = _map.filterValues { it != null }
+}
+
+class Foo : BackedByMap() {
+ var foo: String? by _map
+ var bar: Int? by _map
+}
+
+val f = Foo()
+println(f.map)
+f.foo = "moo"
+f.bar = 5
+println(f.map)
+f.foo = null
+println(f.map)
+f.bar = null
+println(f.map)
diff --git a/app/disposables.kts b/app/disposables.kts
new file mode 100644
index 0000000..b3f682b
--- /dev/null
+++ b/app/disposables.kts
@@ -0,0 +1,25 @@
+import android.view.View
+import io.reactivex.Observable
+import io.reactivex.Single
+import io.reactivex.disposables.CompositeDisposable
+import io.reactivex.disposables.Disposable
+import io.reactivex.schedulers.Schedulers
+
+fun Disposable.addTo(composite: CompositeDisposable) = let(composite::add)
+val disposables = CompositeDisposable()
+Observable.fromArray(*(1L..500L).toList().toTypedArray())
+ .filter { it % 2L == 0L}
+ .doOnNext(Thread::sleep)
+ .subscribeOn(Schedulers.computation())
+ .observeOn(Schedulers.computation())
+ .subscribe { println("$it") }
+ .addTo(disposables)
+
+Thread.sleep(500)
+disposables.clear()
+
+val listener = View.OnClickListener {}
+val view: View? = null
+
+if (view != null) listener.onClick(view)
+view?.let(listener::onClick)
\ No newline at end of file
diff --git a/app/let.kts b/app/let.kts
new file mode 100644
index 0000000..7451e47
--- /dev/null
+++ b/app/let.kts
@@ -0,0 +1,12 @@
+val any: Any = Any()
+val maybe: Any? = null
+
+fun show(maybe: Any?) = print(maybe)
+fun reallyShow(any: Any) = print(any)
+
+show(any)
+show(maybe)
+
+reallyShow(any)
+reallyShow(maybe) // compiler error
+maybe?.run(::reallyShow) // OK
\ No newline at end of file
diff --git a/app/objects.kts b/app/objects.kts
new file mode 100644
index 0000000..6cfbc10
--- /dev/null
+++ b/app/objects.kts
@@ -0,0 +1,30 @@
+interface Factory {
+ var mock: T?
+ fun get(): T
+}
+
+class Provider(init: () -> T): Factory {
+ override var mock: T? = null
+ val instance: T by lazy(init)
+
+ override fun get() = mock ?: instance
+}
+
+class UserRepo {
+ companion object : Factory by Provider({ UserRepo() })
+}
+
+class BizRepo {
+ companion object : Factory by Provider({ BizRepo() })
+}
+
+
+
+UserRepo.get() // returns the real repo
+BizRepo.get() // returns the real repo
+UserRepo.mock = mock(UserRepo)
+BizRepo.mock = mock(BizRepo)
+UserRepo.get() // returns the mock repo
+BizRepo.get() // returns the mock repo
+UserRepo.mock = null
+BizRepo.mock = null
\ No newline at end of file
diff --git a/app/src/androidTest/java/demo/my/myapplication/ExampleInstrumentedTest.kt b/app/src/androidTest/java/demo/my/myapplication/ExampleInstrumentedTest.kt
new file mode 100644
index 0000000..dbf9249
--- /dev/null
+++ b/app/src/androidTest/java/demo/my/myapplication/ExampleInstrumentedTest.kt
@@ -0,0 +1,24 @@
+package demo.my.myapplication
+
+import android.support.test.InstrumentationRegistry
+import android.support.test.runner.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+ @Test
+ fun useAppContext() {
+ // Context of the app under test.
+ val appContext = InstrumentationRegistry.getTargetContext()
+ assertEquals("demo.my.myapplication", appContext.packageName)
+ }
+}
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..1197682
--- /dev/null
+++ b/app/src/main/AndroidManifest.xml
@@ -0,0 +1,11 @@
+
+
+
+
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
new file mode 100644
index 0000000..c7bd21d
--- /dev/null
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -0,0 +1,34 @@
+
+
+
+
+