Retrofit Http Library With Recyclerview Example in Android

Add Library

compile 'com.squareup.retrofit2:retrofit:2.0.2'
compile 'com.android.support:recyclerview-v7:26.0.+'

RetrofitDemoActivity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.bhaumik.networkingtask.RetrofitDemoActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view_retrofit"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

retrofit_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content">


    <ImageView
        android:id="@+id/retrofit_image_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"/>


</LinearLayout>

RetrofitDemoActivity.java

package com.example.bhaumik.networkingtask;

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

import com.example.bhaumik.networkingtask.adapter.RetrofitAdapter;
import com.example.bhaumik.networkingtask.interfaces.Api;
import com.example.bhaumik.networkingtask.pojo.Image;
import com.example.bhaumik.networkingtask.pojo.Network;
import com.example.bhaumik.networkingtask.retrofits.ApiClient;

import java.util.List;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class RetrofitDemoActivity extends AppCompatActivity {

    RecyclerView recyclerView;

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

        recyclerView = (RecyclerView) findViewById(R.id.recycler_view_retrofit);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        adapter = new RetrofitAdapter(RetrofitDemoActivity.this);

        recyclerView.setAdapter(adapter);

        Api api = ApiClient.getRetrofit().create(Api.class);

        Call<Network> call = api.getImageData();

        call.enqueue(new Callback<Network>() {
            @Override
            public void onResponse(Call<Network> call, Response<Network> response) {
                List<Image> list = response.body().getImages();
                adapter.addImage(list);
            }

            @Override
            public void onFailure(Call<Network> call, Throwable t) {
                Log.d("tag","Error -> " +t.toString());
            }
        });
    }
}

RetrofitAdapter.java

package com.example.bhaumik.networkingtask.adapter;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import com.bumptech.glide.Glide;
import com.example.bhaumik.networkingtask.R;
import com.example.bhaumik.networkingtask.pojo.Image;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by Bhaumik on 9/1/2017.
 */

public class RetrofitAdapter extends RecyclerView.Adapter<RetrofitAdapter.RetrofitHolder>{

    List<Image> list;
    Context context;

    public RetrofitAdapter(Context context) {
        list = new ArrayList<>();
        this.context = context;
    }

    @Override
    public RetrofitHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View view = LayoutInflater.from(context).inflate(R.layout.retrofit_item,parent,false);

        return new RetrofitHolder(view);
    }

    @Override
    public void onBindViewHolder(RetrofitHolder holder, int position) {

        String url = "http://www.bing.com/" + list.get(position).getUrl();

        Glide.with(context).load(url).into(holder.imageView);
    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    public static class RetrofitHolder extends RecyclerView.ViewHolder{

        ImageView imageView;

        public RetrofitHolder(View itemView) {
            super(itemView);
            imageView = itemView.findViewById(R.id.retrofit_image_view);
        }
    }

    public void addImage(List<Image> data){

        list.addAll(data);
        notifyDataSetChanged();
    }
}

Create An Interface to Retrofit Api Call.

Api.java

package com.example.bhaumik.networkingtask.interfaces;

import com.example.bhaumik.networkingtask.pojo.Network;

import retrofit2.Call;
import retrofit2.http.Field;
import retrofit2.http.FormUrlEncoded;
import retrofit2.http.GET;
import retrofit2.http.POST;

/**
 * Created by Bhaumik on 9/1/2017.
 */

public interface Api {

    @GET("/HPImageArchive.aspx?format=js&idx=0&n=50&mkt=en-US")
    Call<Network> getImageData();
}

How to Create Retrofit Object And Build Url in retrofit

package com.example.bhaumik.networkingtask.retrofits;


import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class ApiClient {

    public static final String BASE_URL = "http://www.bing.com/";
    public static Retrofit retrofit = null;

    public static Retrofit getRetrofit(){

        if(retrofit == null){

            retrofit = new Retrofit.Builder().baseUrl(BASE_URL)
                        .addConverterFactory(GsonConverterFactory.create())
                    .build();
        }
        return retrofit;
    }
}