Kotlin Programming Cookbook

How to do it…

Let's follow the given steps to understand how coroutines work in Kotlin:

1. There are two functions to start the coroutine:
   • launch{}
   • async{}
2. Let's try to write our first simple coroutine function:

class MainActivity : AppCompatActivity() {    override fun onCreate(savedInstanceState: Bundle?) {        super.onCreate(savedInstanceState)        setContentView(R.layout.activity_main)        launch {            delay(10000)            println("Hello")        }    }}

The preceding function will print "Hello" in the Android Studio console after a duration of 10 seconds. Note that we have used the launch function to start a coroutine, which returns a Job, but it does not carry any resulting value. It starts a new coroutine on a given thread pool (by default, coroutines are run on a shared ...