In software engineering, dependency injection is a technique whereby one object supplies the dependencies of another object.

interface Foo

class FooImpl: Foo

interface Bar

class BarImpl(val foo: Foo): Bar

fun main(args: Array<String>) {
    Kodein {
        bind<Foo>() with singleton { FooImpl() }
        bind<Bar>() with singleton { BarImpl(instance()) }
    }
}

KodeinInjected

class MyActivity : Activity(), KodeinInjected {
    override val injector = KodeinInjector()

    val random: Random by instance()

    override fun onCreate(savedInstanceState: Bundle?) {
        inject(appKodein())
    }
}

@Inject lateinit var random: Random

val random: Random by instance()

KodeinInjected

AndroidInjector

In software engineering, dependency injection is a technique whereby one object supplies the dependencies of another object.