How do I use the Gson converter in RetroFit?

Question

I'm making a simple RetroFit application for educational purposes, and use IntelliJ IDEA as my IDE.

I have imported the Retrofit library properly (at least I think I have) but I'm not able to get the Gson Converter package. I have the gson.jar from google installed but nowhere in either of these libraries is there a class called "GsonConverterFactory", which is required for me to parse JSON.

Edit: I'm on Windows.

Answer 1

Add compile 'com.squareup.retrofit:converter-gson:2.0.0-beta2' to your build.gradle file and get the dependency resolved or add corresponding jars to your bulid path.

then use GsonConverterFactory.create() to get the Converter Factory

I tried using 2.0.0-beta1 but it gave me an illegal type conversion error for factory as given below, so moved to 2.0.0-beta2

  error: method addConverterFactory in class Builder cannot be applied to   given types;
    required: Factory
    found: GsonConverterFactory
    reason: actual argument GsonConverterFactory cannot be converted to Factory by method invocation conversion

So my suggestion is to use 2.0.0-beta2

my build.gradle has following dependencies to resolve retrofit.

 compile 'com.squareup.retrofit:retrofit:2.0.0-beta2'  
 compile 'com.squareup.retrofit:converter-gson:2.0.0-beta2'

Answer 2

If you are using retrofit 2, you need to include the convert-gson package. For gradle builds, you can add compile 'com.squareup.retrofit:converter-gson:2.0.0-beta3' to your dependencies section.

For other build systems, or to download the jar, checkout the Maven Central convert-gson page.

Answer 3

in your Module:app build.gradle add

compile 'com.squareup.retrofit2:converter-gson:[retrofit2 version]'

the version above is same with your retrofit2 version, so for example your retrofit2 version is 2.1.0, than your build.gradle should be like this :

compile 'com.squareup.retrofit2:retrofit:2.1.0'
compile 'com.squareup.retrofit2:converter-gson:2.1.0'