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Add Third Party Libraries

2:29 with Jamie Huson

We’ve set up our app project and now we’re ready to display a list of items from Etsy. To help us interact with the Etsy API we’re going to use two helpful open source libraries, Picasso and Retrofit.

Be sure to check for the latest versions of these libraries available at the sites below:

  • Picasso: lets us load images from the internet without worrying about advanced topics like caching, multi-threading, or memory constraints.
  • Retrofit: enables us to create readable Java interfaces and classes that match the API we are accessing, as well as allowing us to interact with simple Java objects instead of having to parse network responses manually

Bring in Picasso and Retrofit to your API

compile 'com.squareup.picasso:picasso:2.5.0'
compile 'com.squareup.retrofit:retrofit:1.9.0'

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    [MUSIC] 0:00
    Welcome back. 0:04
    We've set up our app project and 0:05
    now we're ready to display a list of items from Etsy. 0:07
    To help us interact with the Etsy API, 0:11
    we're gonna be using two helpful open-source libraries. 0:13
    The first is called Picasso. 0:17
    It allows us to load images from the internet without worrying about advanced 0:19
    topics like caching, multi-threading, or memory constraints. 0:23
    The second is called Retrofit. 0:28
    Retrofit enables us to create readable Java interfaces and 0:30
    classes that match the API we're accessing. 0:34
    It also allows us to interact with simple Java objects instead of having to 0:37
    parse network responses manually. 0:42
    Both Picasso and Retrofit are provided by the same company, Square, 0:44
    which provides other libraries used at TreeHouse, like OkHttp and Butterknife. 0:49
    To add these to our project, we need just two lines of code. 0:55
    Let's jump in and get started. 0:59
    Code libraries can be added just like we did for Google Play Services. 1:02
    We open our build.gradle file. 1:07
    Here in the aptly named dependencies section, 1:08
    we can add two lines to bring in Picasso and Retrofit to our project. 1:11
    Compile statements start with the word compile, then contain a string, 1:16
    and it has three parts. 1:19
    The first part is the project name. 1:21
    The second part is the specific library we want. 1:23
    This is sometimes referred to as the artifact. 1:25
    The final part is the version of the artifact that we want. 1:28
    The latest version can be found by checking the place where the code is 1:31
    posted online. 1:34
    I've provided links to these two projects in the teacher's 1:35
    notes to make sure you grab the latest version. 1:38
    Let's go ahead and add in new dependencies for Picasso. 1:41
    [SOUND] We're gonna use com.squareup.picasso, 1:44
    and the artifact is Picasso, and 1:50
    the version right now is 2.5.0. 1:54
    And for Retrofit, also from Square, 1:59
    [SOUND] version is 1.9.0. 2:05
    And again, every time that we change our build.gradle file, 2:10
    we're going to have to go ahead and sync again. 2:13
    So let's click Sync Now. 2:15
    Now that our sync is done, 2:17
    we can use the code in these libraries that we've just added. 2:20
    We'll get to that in a bit, but let's take a short break and 2:22
    then we'll add a few more classes to our project to help us model our data. 2:25

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