Should Lifecycle.removeObserver be called in Activity? - Android

Question

I am finding clear answer with LifecycleObserver.

class MyActivity : AppCompatActivity(), LifecycleObserver {
    override fun onCreate() {
       ...
       this.lifecycle.addObserver(this)
    }
}

In this situation, should I call removeObserver(this) at onDestroy()? I think it is not necessary, but I couldn't sure it.

I want an official document or real library code, not just opinion.

Answer 1

No you don't need to call removeObserver() .

It's surprisingly difficult to find anything about this in the docs. There is an Issue about this in the repo for the code lab for Lifecycles, where someone asks:

Here, there is addObserver() call, but there is no removeObserver() call for onDestroy. Is this intentional?

And Jose Alcerreca (an Android Developer Relations Engineer at Google) says:

Yes, that's the whole point of the new lifecycle-aware components, no need to unsubscribe/remove observers.