Two weeks ago i wrote an Android app with connection to a REST-API. As yet i used Volley for requests. But i finally took a look at Retrofit and i think i like it. In this post i want to give a short introduction on how to use it.

What is Retrofit?

Retrofit is type-safe HTTP client for Android and Java by Square, Inc.
You can use it to simplify your API calls.

1) Create Project

Add internet permission to your AndroidManifest.xml:

Add Retrofit in your build.gradle:

In this example i will use Gson for JSON deserialization.

2) Create a new interface

In this example the baseUrl is “”
With the annotations you can set the standard HTTP methods like (GET, POST, PUT, DELETE, PATCH, and HEAD).

For example when you call getSinglePostQuery(3) Retrofit will connect to
When you call getSinglePost(3) it will be

3) Create Java class for parsing

This is how a typical response from looks like.

And this is my class that Gson will use to create objects from the JSON response:

4) Use the interface

Now you can use the methods from your network interface anywhere you want.

The Response in onResponse will return a List of Posts.
I think Retrofit is a easy way to connect to an REST-API.

Example Project

You can find my example project on GitHub

BTW: I used a similar library (Refit) in a Xamarin Project