Our application is in pretty good shape.

There is, however,

one other thing we can do to help the performance of our RecyclerView.

We can enable an optimization for cases when the size of the data set is static.

In our case, the hourly forecast we're getting back from Dark Sky will always

have the same number of items.

We won't be adding or deleting any items.

So, inside HourlyForecastActivity, we'll want to add this line.

So, after we've done our binding, do binding.hourlyListItems,

we'll use setHasFixedSize, set it to true.

This allows the RecyclerView to perform several optimizations

by knowing in advance that the size won't be affected by the adapter contents.

While we're done with this app for now, I would like to stress that RecyclerView

is very flexible and customizable, with a lot of available options.

If we take a look at the documentation, we can find a list of public methods,

and see a lot of them listed out.

For example, if we want to add a dividing line between our list items,

we can use this addItemDecoration method.

So we go back to our app.

Down here.

We can do binding.

HourlyListItems, we'll andItemDecoration.

We can pass in, for example, a divider line.

We'll do a new DividerItemDecoration.

Context is this.

And we'll do a DividerItemDecoration.

And we want it to be vertical.

Let's see what that looks like.

Run our app again.

Go over to the hourly forecast, and there's our divider lines.

Perhaps not needed in the Stormy app, but it doesn't look too bad.

There's definitely lots of ways to enhance an app with RecyclerView.

I'd encourage you to see what you can do to make this app even better.

There are some great animations available from,

I'm not sure how to pronounce this exactly, wasabeef's GitHub site.

You could try implementing some of these into your project.

Or Treehouse offers a great course on animations and transitions,

check the teacher's notes for links