Activity extending YouTubeBaseActivity

public class CustomYouTubeActivity extends YouTubeBaseActivity implements YouTubePlayer.OnInitializedListener, YouTubePlayer.PlayerStateChangeListener {

    private YouTubePlayerView mPlayerView;
    private YouTubePlayer mYouTubePlayer;
    private String mVideoId = "B08iLAtS3AQ";
    private String mApiKey;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mApiKey = Config.YOUTUBE_API_KEY;
        mPlayerView = new YouTubePlayerView(this);
        mPlayerView.initialize(mApiKey, this); // setting up OnInitializedListener
        addContentView(mPlayerView, new LayoutParams(LayoutParams.MATCH_PARENT,
                LayoutParams.MATCH_PARENT)); //show it in full screen
    }

    //Called when initialization of the player succeeds.
    @Override
    public void onInitializationSuccess(YouTubePlayer.Provider provider,
                                        YouTubePlayer player,
                                        boolean wasRestored) {

        player.setPlayerStateChangeListener(this); // setting up the player state change listener
        this.mYouTubePlayer = player;
        if (!wasRestored)
            player.cueVideo(mVideoId);
    }

        @Override
    public void onInitializationFailure(YouTubePlayer.Provider provider,
                                        YouTubeInitializationResult errorReason) {

        Toast.makeText(this, "Error While initializing", Toast.LENGTH_LONG).show();
    }

    @Override
    public void onAdStarted() {
    }

    @Override
    public void onLoaded(String videoId) { //video has been loaded
        if(!TextUtils.isEmpty(mVideoId) && !this.isFinishing() && mYouTubePlayer != null)
            mYouTubePlayer.play(); // if we dont call play then video will not auto play, but user still has the option to play via play button
    }

    @Override
    public void onLoading() {
    }

    @Override
    public void onVideoEnded() {
    }

    @Override
    public void onVideoStarted() {

    }

    @Override
    public void onError(ErrorReason reason) {
        Log.e("onError", "onError : " + reason.name());
    }

}