How to resolve expecting class body error in kotlin

Question

The Code:

var shouldStopLoop = false

val handler = object : Handler()
val runnable = object: Runnable            //error occurs here
{
    override fun run() {
        getSubsData()
        if(!shouldStopLoop)
        {
            handler.postDelayed(this, 5000)
        }
    }
}

handler.post(runnable)

Expecting a class body error occurs while I am trying to create the val runnable.

Answer 1

the error occurs because you are treating Handler as an abstract class in the following statement:

val handler = object : Handler()

this statement needs a class body after it as the error says, like this:

val handler = object : Handler(){}

However, as Handler is not an abstract class more appropriate statement will be:

val handler = Handler()

Answer 2

You can try next approach:

// function takes lambda extension function on class Runnable as the parameter, it is known as lambda with receiver
inline fun runnable(crossinline body: Runnable.() -> Unit) = object : Runnable {
    override fun run() = body()
}

fun usingRunnable() {
    val handler = Handler()
    val runnableCode = runnable {
        getSubsData()
        if(!shouldStopLoop)
        {
            handler.postDelayed(this, 5000)
        }
    }
    handler.post(runnableCode)
}