Variable 'runnable' must be initialized

Question

Why does Kotlin complains about this:

class MyActivity : Activity {
  private var handler:Handler = Handler()

  private var runnable: Runnable = Runnable {
         


        

Answer 1

You can also use

private var runnable: Runnable = Runnable {
    /* Do something very important */
    handler.postDelayed(runnable(), 5000)
}

private fun runnable() = runnable