Integrate custom youtube player using library.

activity_youtube_video.xml

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

    <com.pierfrancescosoffritti.androidyoutubeplayer.player.YouTubePlayerView
        android:id="@+id/youtube_player_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:visibility="visible"/>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

build.gradle

implementation 'com.pierfrancescosoffritti.androidyoutubeplayer:core:8.0.1'
implementation "android.arch.lifecycle:extensions:1.1.1"

item_youtube_video.xml

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

    <com.pierfrancescosoffritti.androidyoutubeplayer.player.YouTubePlayerView
        android:id="@+id/youtube_player_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

VideoPagerAdapter.java

package com.rajnit.photostudio.adapter;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.pierfrancescosoffritti.androidyoutubeplayer.player.YouTubePlayer;
import com.pierfrancescosoffritti.androidyoutubeplayer.player.YouTubePlayerView;
import com.pierfrancescosoffritti.androidyoutubeplayer.player.listeners.AbstractYouTubePlayerListener;
import com.pierfrancescosoffritti.androidyoutubeplayer.player.listeners.YouTubePlayerInitListener;
import com.pierfrancescosoffritti.androidyoutubeplayer.ui.PlayerUIController;
import com.rajnit.photostudio.R;

/**
 * Created by PhotoStudio on 07/09/18.
 */

public class VideoPagerAdapter extends PagerAdapter {

    private Context mContext;

    public VideoPagerAdapter(Context context) {
        mContext = context;
    }

    @Override
    public Object instantiateItem(ViewGroup collection, int position) {
        LayoutInflater inflater = LayoutInflater.from(mContext);
        ViewGroup layout = (ViewGroup) inflater.inflate(R.layout.item_youtube_video, collection, false);
        collection.addView(layout);

        YouTubePlayerView youtubePlayerView = layout.findViewById(R.id.youtube_player_view);

        PlayerUIController playerUIController = youtubePlayerView.getPlayerUIController();
        playerUIController.showFullscreenButton(false);


        youtubePlayerView.initialize(new YouTubePlayerInitListener() {
            @Override
            public void onInitSuccess(@NonNull final YouTubePlayer initializedYouTubePlayer) {
//                youTubePlayer = initializedYouTubePlayer;
                initializedYouTubePlayer.addListener(new AbstractYouTubePlayerListener() {
                    @Override
                    public void onReady() {
                        String videoId = "-m3V8w_7vhk";
                        initializedYouTubePlayer.cueVideo(videoId, 0);
                    }
                });
            }
        }, false);

        return layout;
    }

    @Override
    public void destroyItem(ViewGroup collection, int position, Object view) {
        collection.removeView((View) view);
    }

    @Override
    public int getCount() {
        return 10;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return "Page : " + position;
    }

}

YoutubeVideoActivity.java

package com.rajnit.photostudio;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;

import com.pierfrancescosoffritti.androidyoutubeplayer.player.YouTubePlayer;
import com.pierfrancescosoffritti.androidyoutubeplayer.player.YouTubePlayerView;
import com.pierfrancescosoffritti.androidyoutubeplayer.player.listeners.AbstractYouTubePlayerListener;
import com.pierfrancescosoffritti.androidyoutubeplayer.player.listeners.YouTubePlayerInitListener;

public class YoutubeVideoActivity extends AppCompatActivity {

    private static final String TAG = "YoutubeVideoActivity";

    public ViewPager viewPager;
    public YouTubePlayerView youtubePlayerView;
    public YouTubePlayer youTubePlayer;

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

        youtubePlayerView = findViewById(R.id.youtube_player_view);

      // add below line and no need to handle pause or release youtube player...
        getLifecycle().addObserver(youtubePlayerView);
            
        youtubePlayerView.initialize(new YouTubePlayerInitListener() {
            @Override
            public void onInitSuccess(@NonNull final YouTubePlayer initializedYouTubePlayer) {
                youTubePlayer = initializedYouTubePlayer;
                initializedYouTubePlayer.addListener(new AbstractYouTubePlayerListener() {
                    @Override
                    public void onReady() {
                        String videoId = "-m3V8w_7vhk";
                        initializedYouTubePlayer.loadVideo(videoId, 0);
                    }
                });
            }
        }, false);

        youtubePlayerView.getPlayerUIController().setFullScreenButtonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.d(TAG, "setFullScreenButtonClickListener: ");
            }
        });

        youtubePlayerView.getPlayerUIController().showYouTubeButton(false);
        youtubePlayerView.getPlayerUIController().showCurrentTime(false);
        youtubePlayerView.getPlayerUIController().showDuration(false);
//        youtubePlayerView.getPlayerUIController().showSeekBar(false);

      /* Try viewpager demo... */
       viewPager = findViewById(R.id.viewPager);
       viewPager.setAdapter(new VideoPagerAdapter(this));

      
    }

}