How to handle error states with LiveData?

Question

The new LiveData can be used as a replacement for RxJava\'s observables in some scenarios. However, unlike Observable, LiveData has no callback for

Answer 1

In my app, I had to translate RxJava Observables into LiveData. While doing that, I of course had to maintain the error state. Here's how I did it (Kotlin)

class LiveDataResult<T>(val data: T?, val error: Throwable?)

class LiveObservableData<T>(private val observable: Observable<T>) : LiveData<LiveDataResult<T>>() {
    private var disposable = CompositeDisposable()

    override fun onActive() {
        super.onActive()

        disposable.add(observable.subscribe({
            postValue(LiveDataResult(it, null))
        }, {
            postValue(LiveDataResult(null, it))
        }))
    }

    override fun onInactive() {
        super.onInactive()

        disposable.clear()
    }
}