ObserveUntilFinished example

ObserveUntilFinished.kt

fun <T> observeUntilFinished(liveData: LiveData<T>, observer: Observer<T>? = null) {
    liveData.observeForever(object : Observer<T> {
        override fun onChanged(resource: Resource<T>?) {
            observer?.onChanged(resource)
            liveData.removeObserver(this) // SAM conversion is not applicable because of `this`
        }
    })
}