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[MUSIC]

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Welcome back.

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We've set up our app project and

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now we're ready to display
a list of items from Etsy.

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To help us interact with the Etsy API,

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we're gonna be using two
helpful open-source libraries.

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The first is called Picasso.

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It allows us to load images from the
internet without worrying about advanced

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topics like caching, multi-threading,
or memory constraints.

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The second is called Retrofit.

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Retrofit enables us to create
readable Java interfaces and

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classes that match
the API we're accessing.

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It also allows us to interact with
simple Java objects instead of having to

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parse network responses manually.

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Both Picasso and Retrofit are provided
by the same company, Square,

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which provides other libraries used at
TreeHouse, like OkHttp and Butterknife.

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To add these to our project,
we need just two lines of code.

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Let's jump in and get started.

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Code libraries can be added just like
we did for Google Play Services.

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We open our build.gradle file.

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Here in the aptly named
dependencies section,

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we can add two lines to bring in
Picasso and Retrofit to our project.

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Compile statements start with the word
compile, then contain a string,

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and it has three parts.

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The first part is the project name.

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The second part is
the specific library we want.

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This is sometimes referred
to as the artifact.

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The final part is the version
of the artifact that we want.

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The latest version can be found by
checking the place where the code is

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posted online.

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I've provided links to these
two projects in the teacher's

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notes to make sure you
grab the latest version.

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Let's go ahead and
add in new dependencies for Picasso.

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[SOUND] We're gonna use
com.squareup.picasso,

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and the artifact is Picasso, and

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the version right now is 2.5.0.

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And for Retrofit, also from Square,

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[SOUND] version is 1.9.0.

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And again, every time that we
change our build.gradle file,

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we're going to have to go ahead and
sync again.

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So let's click Sync Now.

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Now that our sync is done,

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we can use the code in these
libraries that we've just added.

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We'll get to that in a bit, but
let's take a short break and

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then we'll add a few more classes to
our project to help us model our data.