Add Third Party Libraries

[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