RxJava introduced Single. How do I convert an Observable to a Single?

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I think another answer is outdated. You should probably check the following methods.

singleOrError: Emits the one and only element, IndexOutOfBoundsException if the source is longer than 1 item or a NoSuchElementException if the source is empty.

firstOrError: Emits the first element or a NoSuchElementException if the source is empty.

lastOrError: Emits the lastelement or a NoSuchElementException if the source is empty.

elementAtOrError: Emits the indexth element or a NoSuchElementException.

More info on this page: https://github.com/ReactiveX/RxJava/wiki/What%27s-different-in-2.0

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