How to get List from JSON list using Retrofit 2?

Question

I am new to Android. I need to get a list of strings from a JSON list. It will be added to a Spinner list. I have the list on server like

[{\"bgrou         


        

Answer 1

This is sample code :

 GroupService groupService = createService(GroupService.class);

 Call<List<Groups>> groupCall = groupService.getGroups();

    groupCall.enqueue(new Callback<List<Groups>>() {
            @Override
            public void onResponse(retrofit.Response<List<Groups>> response, Retrofit retrofit) {


            }

            @Override
            public void onFailure(Throwable t) {
                t.printStackTrace();

            }
        });

Interfaces :

public interface GroupService {

@GET("<URL>")
Call<List<Groups>> getGroups();
}

Also create model name Groups.

I hope this helps you.

Answer 2

Make the following model class (parcelable)

package com.example;

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

public class Example implements Parcelable {

@SerializedName("bgroup")
@Expose
private String bgroup;

public String getBgroup() {
return bgroup;
}

public void setBgroup(String bgroup) {
this.bgroup = bgroup;
}


    protected Example(Parcel in) {
        bgroup = in.readString();
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(bgroup);
    }

    @SuppressWarnings("unused")
    public static final Parcelable.Creator<Example> CREATOR = new Parcelable.Creator<Example>() {
        @Override
        public Example createFromParcel(Parcel in) {
            return new Example(in);
        }

        @Override
        public Example[] newArray(int size) {
            return new Example[size];
        }
    };
}

Than create interface class like this

public interface ApiService {

@GET("<URL>")
Call<List<Example>> getBloodGroups();
}

And finally call retrofit like following :

Call<List<Example>> call = new RestClient(this).getApiService()
                .getBloodGroups();
        call.enqueue(new Callback<List<Example>>() {
            @Override
            public void onResponse(Call<List<Example>> call, Response<List<Example>> response) {

            }

            @Override
            public void onFailure(Call<List<Example>> call, Throwable throwable) {

            }
        });