Android LiveData prevent receive the last value on observe

Question

Is it possible to prevent LiveData receive the last value when start observing? I am considering to use LiveData as events.

For example eve

Answer 1

There is no reason to use LiveData as something that it is not. If you need a separate behavior (something that doesn't retain the previous value), then you should use a component that doesn't retain the previous value -- instead of hacking around it ("remembering" that it had emitted and then forgetting to emit, etc.)

You can add event-emitter library:

implementation 'com.github.Zhuinden:live-event:1.1.0'

from Jitpack: maven { url "https://jitpack.io" }

Then you can do

private val eventEmitter = EventEmitter()
val controllerEvents: EventSource = eventEmitter

and

controllerEvents.observe(viewLifecycleOwner) { event: WordController.Events ->
    when (event) {
        is WordController.Events.NewWordAdded -> showToast("Added ${event.word}")
    }.safe()
}