In the last article, we took a basic look at RxJava, and used
Observable.create() to create our
Observable. We also setup an
Observer that listens for data. In this blog post, we’ll talk about
Single.just() and how it differs from
Observable.just(). Let’s get started!
Let’s make some changes to our
What exactly is going on here? First, we changed
firstName. As you can tell, we only pass in one name, “Daniel.” But the important thing to note is that
Observable.just() got changed to
Single.just(). What’s the difference? The difference lies with the subscriber. If you look at the observer variable, you’ll noticed a few things changed. First of all, we only have 2 callback methods:
Before we had methods like
Single, we only get these 2 methods:
onError. That’s it. If it’s successful, the name “Daniel” will go to
onSuccess(). If for some reason there is an error,
onError() will be called.
Single, we simply care about the 1 result, or the 1 error, that’s all.
Single cannot accept multiple names like Mel, Daniel or Nathan. Just one name, like Daniel.
Single, you can pass a list of names, but the names will be in
List<String> instead of just