Nullability and LiveData with Kotlin

Question

I want to use LiveData with Kotlin and have values that should not be null. How do you deal with this? Perhaps a wrapper around LiveData? Searching for good patterns here .. As

Answer 1

You can do this

normalLiveData
  .nonNull()
  .observe(this, { result -> 
    // result is non null now
  })

There is an article about it. https://medium.com/@henrytao/nonnull-livedata-with-kotlin-extension-26963ffd0333

Answer 2

You can create an extension for LifecycleOwner

fun <T> LifecycleOwner.observe(liveData: LiveData<T?>, lambda: (T) -> Unit) {
    liveData.observe(this, Observer { if (it != null) lambda(it) })
}

and then in your fragment/activity

observe(liveData) { ... }