Using Retrofit to access JSON arrays

Question

I thought I understood how to do this, but obviously not. I have my API from Flickr, which begins like so:

jsonFlickrApi({
   \"photos\":{
      \"page\":1,         


        

Answer 1

A quick look at Retrofit's docs says it uses Gson to convert JSON to Java classes. This means you need a class hierarchy in Java that matches the JSON. Yours ... doesn't.

The returned JSON is an object with a single field "photos" that holds an object;

{ "photos" : { ... } }

So, your top level class would be a Java class with a single field:

public class PhotosResponse {
    private Photos photos;

    // getter/setter
}

And that Photos type would be another class that matches the JSON for the object that field contains:

{ "page":1, "pages":10, ... }

So you'd have:

public class Photos {
    private int page;
    private int pages;
    private int perpage'
    private int total;
    private List photo;

    // getters / setters
}

And then you'd create a Photo class to match the structure of the object in that inner array. Gson will then map the returned JSON appropriately.