How to consume this JSON structure via Retrofit 2?

Question

Hello I have a json structure and I need to get the datas from url. How can I do that? What are classes and functions. Please help me. Thanks.

here is my json.

Answer 1

http://www.jsonschema2pojo.org/

Put your JSON response here and download java code from this website . Then put this java code into your project and use it . This website will make all required classes with all required fields which will be perfect fit for your response of JSON. I have used it many time this will surely work.

http://square.github.io/retrofit/ here you can get detailed information about how to use retrofit to POST or GET data .

Retrofit turns your HTTP API into a Java interface.

public interface YourService {
  @GET("users/{user}/repos")
  Call<List<Repository>> listRepos(@Path("user") String user);
}

The Retrofit class generates an implementation of the interface.

Retrofit retrofit = new Retrofit.Builder()
    .baseUrl("https://api.yourAPI.com/")
    .build();

YourService  service = retrofit.create(YourService .class);

Call<List<Repository>> repos = service.listRepos("myrepository");

Use annotations to describe the HTTP request:

• URL parameter replacement and query parameter support Object conversion to request body (e.g., JSON, protocol buffers) Multipart request body and file upload

Answer 2

Use jsonschema2pojo.org Paste you responce and it will generate Java classes for you. You instantiate Retrofit instance by setting all necessary components like this:

Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(BuildConfig.BASE_URL)
                .client(okHttpClient)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .build();

and your interfaces will look like:

@GET("api/service/schedule/{filial}")
    Observable<Response<List<Event>>> getSchedule(@Path("filial") String filial);

where @GET- annotation defining request type, Response<> - type used by Retrofit, carrying information whether response is successful or not (see class methods). Observable<> - type from rxJava library, allowing to process request in reactive way. I strongly recommend to use RxJava, because it simplifies execution in background very much. (DON't use AsyncTasks!!).

in order to use Retrofit2 add following lines to your Gradle file:

   //Reactive programming
    compile 'io.reactivex:rxjava:1.1.5'
    compile 'io.reactivex:rxandroid:1.2.0'


    compile 'com.google.code.gson:gson:2.4'
    //retrofit and okhttp
    compile 'com.squareup.okhttp3:okhttp:3.2.0'
    compile 'com.squareup.retrofit2:retrofit:2.0.2'
    compile 'com.squareup.retrofit2:converter-gson:2.0.2'
    compile 'com.squareup.retrofit2:adapter-rxjava:2.0.2'

You will instantiate Retrofit2 interface by a similar call: retrofit.create(Api.class)