FragmentResultListener

FragmentResultListener.kt

fun Fagment.fragmentListeners(block: FragmentListenerBuilder.() -> Unit) {
    val builder = FragmentListenerBuilder().apply(block)
    builder.keys.forEach {
        val manager = if (it.value) childFragmentManager else parentFragmentManager
        manager.setFragmentResultListener(it.key, this, builder.listener)
    }
}

class FragmentListenerBuilder {
    var listener: (String, Bundle) -> Unit = { _, _ -> }
    val keys = mutableMapOf<String, Boolean>()
    fun child(key: String) {
        keys[key] = true
    }
    fun parent(key: String) {
        keys[key] = false
    }
}

Usage.kt

fragmentListeners {
    child(KEY_FOR_CHILD_FRAGMENT_MANAGER)
    parent(KEY_FOR_PARENT_FRAGMENT_MANAGER)
    
    listener = { requestkey, bundle ->
        when(requestkey){
            KEY_FOR_CHILD_FRAGMENT_MANAGER -> //do something
            KEY_FOR_PARENT_FRAGMENT_MANAGER -> //do something
        }
    }
}