Convenient extensions for LiveData in Kotlin

LiveDataExtensions.kt

   fun <T> LiveData<T>.observeOnce(lifecycleOwner: LifecycleOwner,observer: androidx.lifecycle.Observer<T>) {
        observe(lifecycleOwner, object : androidx.lifecycle.Observer<T> {
            override fun onChanged(t: T) {
                observer.onChanged(t)
                removeObserver(this)
            }
        })
    }