Why does I'm not getting lifecycleScope in Java Android?

Question

Exactly this below code I want to use in my existing Java class, because write now it is not possible to convert entire class in Kotlin:

viewLifecycleOwner.lifecycleScope.launchWhenStarted {
    viewModel.tasksEvent.collect { event ->
            
    }
}

Kindly suggest the best approach. I know AsyncTask is deprecated.

Answer 1

Since lifecycleScope it's an extension function you need to call it with a different syntax from java:

LifecycleOwnerKt.getLifecycleScope(this)

Where this is your activity, fragment, etc.

After that you can pass that lifecycleScope to a new kotlin class and return the result with a callback, something like this:

KotlinClass.kt

class KotlinClass {
    fun useCoroutineScope(
        scope: LifecycleCoroutineScope,
        callback: (SomeType) -> Unit
    ) {
        scope.launchWhenCreated {
            // Computation code...
            callback(someValue)
        }
    }
}

}