Dependency: (In gradle file)

    implementation 'com.google.code.gson:gson:2.8.5'

    implementation 'com.squareup.retrofit2:converter-gson:2.6.0'

    implementation 'com.squareup.retrofit2:retrofit:2.6.0'

    implementation 'com.android.support:recyclerview-v7:28.0.0'

Manifest

  <uses-permission android:name="android.permission.INTERNET"/>

Api client java file.

class APIClient {

    private static Retrofit retrofit = null;

    static Retrofit getClient() {

//

//        HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();

//        interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

//        OkHttpClientttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor).build();

        retrofit = new Retrofit.Builder()

//                .baseUrl("https://reqres.in")

                .baseUrl("https://jsonplaceholder.typicode.com/")

                .addConverterFactory(GsonConverterFactory.create())

//                .client(client)

                .build();

        return retrofit;

    }

}

**********************************************************************

Api Interface

interface APIInterface {

    @GET("/comments")

    Call<ArrayList<Comments>> getComments();

}

***********************************************************************

Model class

public class Comments {

    private long postID;

    private long id;

    private String name;

    private String email;

    private String body;

    public long getPostID() { return postID; }

    public void setPostID(long value) { this.postID = value; }

    public long getID() { return id; }

    public void setID(long value) { this.id = value; }

    public String getName() { return name; }

    public void setName(String value) { this.name = value; }

    public String getEmail() { return email; }

    public void setEmail(String value) { this.email = value; }

    public String getBody() { return body; }

    public void setBody(String value) { this.body = value; }

}

*******************************************************************************

public class MainActivity extends AppCompatActivity {

    APIInterface apiInterface;

    RecyclerView mList;

    MyRecyclerAdapter adapter;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mList = findViewById(R.id.list);

        apiInterface = APIClient.getClient().create(APIInterface.class);

        Call<ArrayList<Comments>> c = apiInterface.getComments();

        c.enqueue(new Callback<ArrayList<Comments>>() {

            @Override

            public void onResponse(Call<ArrayList<Comments>> call, Response<ArrayList<Comments>> response) {

                Log.e("data",response.body().toString());

                adapter = new MyRecyclerAdapter(MainActivity.this,response.body());

                mList.setAdapter(adapter);

            }

            @Override

            public void onFailure(Call<ArrayList<Comments>> call, Throwable t) {

            }

        });

    }

}

*******************************************************************************

Recycler adapter (in java file)

package com.example.retrofitex.Adapter;

import android.content.Context;

import android.support.annotation.NonNull;

import android.support.v7.widget.RecyclerView;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

import com.example.retrofitex.R;

import com.example.retrofitex.pojo.Comments;

import java.util.ArrayList;

public class MyRecyclerAdapter extends RecyclerView.Adapter<MyRecyclerAdapter.ViewHolder> {

    LayoutInflater inflater;

    ArrayList<Comments> allItems;

    Context context;

    public MyRecyclerAdapter(Context context,ArrayList<Comments> comments){

            inflater = LayoutInflater.from(context);

            this.context = context;

            this.allItems = comments;

    }

    @NonNull

    @Override

    public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {

        View view = inflater.inflate(R.layout.adapter_view,viewGroup,false);

        return new ViewHolder(view);

    }

    @Override

    public void onBindViewHolder(@NonNull final ViewHolder holder,

                                 final int i) {

        Comments c = allItems.get(i);

        holder.mName.setText(c.getName()+"");

    }

    @Override

    public int getItemCount() {

        return allItems.size();

    }

    public class ViewHolder extends RecyclerView.ViewHolder{

        TextView mName;

        public ViewHolder(@NonNull View view) {

            super(view);

            this.mName = view.findViewById(R.id.name);

        }

    }

}

******************************************************************************

Adapter view ..

<?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="wrap_content"
    tools:context=".MainActivity">


    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/name"
        android:padding="10dp"

        />

</LinearLayout>

*******************************************************************************

activity_main.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"
    tools:context=".MainActivity">

    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:listitem="@layout/adapter_view"
        android:orientation="vertical"
        app:layoutManager="android.support.v7.widget.LinearLayoutManager"
        android:id="@+id/list"
        />

</LinearLayout>

Exployer

Gradle Dependency :

  implementation 'com.google.android.exoplayer:exoplayer:2.8.4'

Manifest : 

Internet Permission

Layout file : 

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout 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"

    tools:context=".MainActivity">

    <com.google.android.exoplayer2.ui.SimpleExoPlayerView

        android:layout_width="match_parent"

        app:resize_mode="fill"

        android:layout_height="match_parent"

        android:id="@+id/view"

        />

</android.support.constraint.ConstraintLayout>

*****************************************************************************************

Main java file

*****************************************************************************************

import android.content.DialogInterface;

import android.net.Uri;

import android.os.Handler;

import android.support.v7.app.AlertDialog;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import com.google.android.exoplayer2.ExoPlayerFactory;

import com.google.android.exoplayer2.SimpleExoPlayer;

import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory;

import com.google.android.exoplayer2.extractor.ExtractorsFactory;

import com.google.android.exoplayer2.source.ExtractorMediaSource;

import com.google.android.exoplayer2.source.MediaSource;

import com.google.android.exoplayer2.trackselection.AdaptiveTrackSelection;

import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;

import com.google.android.exoplayer2.trackselection.TrackSelector;

import com.google.android.exoplayer2.ui.SimpleExoPlayerView;

import com.google.android.exoplayer2.upstream.BandwidthMeter;

import com.google.android.exoplayer2.upstream.DefaultBandwidthMeter;

import com.google.android.exoplayer2.upstream.DefaultHttpDataSource;

import com.google.android.exoplayer2.upstream.DefaultHttpDataSourceFactory;

public class MainActivity extends AppCompatActivity {

    private SimpleExoPlayerView simpleExoPlayerView;

    private String hlsVideoUri = "https://www.radiantmediaplayer.com/media/bbb-360p.mp4";

    private SimpleExoPlayer player;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        simpleExoPlayerView = findViewById(R.id.view);

        try{

            BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();

            TrackSelector trackSelector = new DefaultTrackSelector(new AdaptiveTrackSelection.Factory(bandwidthMeter));

            player = ExoPlayerFactory.newSimpleInstance(this,trackSelector);

            Uri videoUri = Uri.parse(hlsVideoUri);

            DefaultHttpDataSourceFactory dataSourceFactory = new DefaultHttpDataSourceFactory("exoplayer_video");

            ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();

            MediaSource mediaSource = new ExtractorMediaSource(videoUri,dataSourceFactory,extractorsFactory,null,null);

            simpleExoPlayerView.setPlayer(player);

            player.prepare(mediaSource);

            player.setPlayWhenReady(true);

        }catch (Exception e){

            Log.e("error",Log.getStackTraceString(e));

        }

    }

}