package com.mkurbanov.json;

import java.util.List;

import retrofit2.Call;
import retrofit2.http.GET;

/**
 * Created by Admin on 02.04.2018.
 */
public interface MessagesApi {
    @GET("messages1.json")
    Call<List<Message>> messages();
}

package com.mkurbanov.json;

/**
 * Created by Admin on 02.04.2018.
 */
public class Message {

        private long id;
        private long time;
        private String text;
        private String image;

        // getters and setters
}

package com.mkurbanov.json;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

import java.util.List;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.Converter;
import retrofit2.converter.gson.GsonConverterFactory;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("https://rawgit.com/startandroid/data/master/messages/")
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        MessagesApi messagesApi = retrofit.create(MessagesApi.class);

        Call<List<Message>> messages = messagesApi.messages();

        messages.enqueue(new Callback<List<Message>>() {
            @Override
            public void onResponse(Call<List<Message>> call, Response<List<Message>> response) {
                if (response.isSuccessful()) {
                    Log.d("tag", "response " + response.body().size());
                } else {
                    Log.d("tag", "response code " + response.code());
                }
            }

            @Override
            public void onFailure(Call<List<Message>> call, Throwable t) {
                Log.d("tag","failure " + t);
            }
        });

    }
}