SampleActivity.kt

import android.app.Activity
import android.os.Bundle
import android.widget.Toast
import kotlinx.coroutines.experimental.android.UI
import kotlinx.coroutines.experimental.delay
import kotlinx.coroutines.experimental.launch
import java.util.concurrent.TimeUnit

/**
 * Example using Kotlin Coroutines:
 * https://kotlinlang.org/docs/tutorials/coroutines-basic-jvm.html
 */
class SampleActivity: Activity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        launch (UI){
            delay(5, TimeUnit.SECONDS)
            Toast.makeText(this@SampleActivity, "Hello", Toast.LENGTH_SHORT).show()
        }
    }
}