Method removeObserver

app/src/main/java/androidx/lifecycle/LiveData.java:243–252

Removes the given observer from the observers list. @param observer The Observer to receive events.

(final @NonNull Observer<? super T> observer)

     * @param observer The Observer to receive events.
     */
    @MainThread
    public void removeObserver(final @NonNull Observer<? super T> observer) {
        assertMainThread("removeObserver");
        ObserverWrapper removed = mObservers.remove(observer);
        if (removed == null) {
            return;
        }
        removed.detachObserver();
        removed.activeStateChanged(false);
    }

    /**
     * Removes all observers that are tied to the given {@link LifecycleOwner}.