E/MediaPlayer: error (1, -38)
E/MediaPlayer: error (1, -2147483648)
E/MediaPlayer: Error (1,-38)
E/MediaPlayer: error (1, -2147479551)
E/MediaPlayer: error (1, -38)

E/MediaPlayer: error (1, -2147479551)
E/MediaPlayer: Error (1,-2147479551)
E/MediaPlayer: error (1, -38)

E/MediaPlayer: error (1, -38)
E/MediaPlayer: error (1, -2147479551)
E/MediaPlayer: error (1, -38)
E/MediaPlayer: Error (1,-38)

MEDIA_ERROR_SYSTEM = -2147483648

MEDIA_ERROR_UNKNOWN = 1

    Playlist masterPlaylist;
    public boolean surfaceCreated;
    AudioURI currentSong;
    AudioURI nextSong;
    MediaPlayer mediaPlayer;
    MediaPlayer nextMediaPlayer;
    VideoView videoView;
    final Object lock = new Object();

    MediaPlayer.OnCompletionListener onCompletionListener = new MediaPlayer.OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mediaPlayer2) {
            synchronized (lock) {
                Log.i(TAG, "onCompletion started");
                currentSong = nextSong;
                mediaPlayer.release();
                mediaPlayer = nextMediaPlayer;
                if (surfaceCreated) {
                    mediaPlayer.setDisplay(videoView.getHolder());
                    mediaPlayer.start();
                }
                nextSong = masterPlaylist.next();
                executorService.submit(runnableNextMediaPlayer);
                Log.i(TAG, "onCompletion ended");
            }
        }
    };

    View.OnClickListener onClickListener = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Log.i(TAG, "onClick started");
            currentSong = nextSong;
            mediaPlayer.release();
            mediaPlayer = nextMediaPlayer;
            if (surfaceCreated) {
                mediaPlayer.setDisplay(videoView.getHolder());
                mediaPlayer.start();
            }
            nextSong = masterPlaylist.next();
            executorService.submit(runnableNextMediaPlayer);
            Log.i(TAG, "onClick ended");
        }
    };

    ExecutorService executorService = Executors.newSingleThreadExecutor();

    Runnable runnableNextMediaPlayer = new Runnable() {
        @Override
        public void run() {
            synchronized (lock) {
                Log.i(TAG, "creating next MediaPlayer");
                nextMediaPlayer = MediaPlayer.create(getApplicationContext(), nextSong.getUri());                nextMediaPlayer.setVideoScalingMode(MediaPlayer.VIDEO_SCALING_MODE_SCALE_TO_FIT_WITH_CROPPING);
                nextMediaPlayer.setOnCompletionListener(onCompletionListener);
                Log.i(TAG, "next MediaPlayer created");
            }
        }
    };

    public void calledAtTheEndOfOnCreate() {
        videoView = findViewById(R.id.video_view);
        currentSong = masterPlaylist.next();
        mediaPlayer = MediaPlayer.create(getApplicationContext(), currentSong.getUri());
        mediaPlayer.setVideoScalingMode(MediaPlayer.VIDEO_SCALING_MODE_SCALE_TO_FIT_WITH_CROPPING);
        mediaPlayer.setOnCompletionListener(onCompletionListener);
        nextSong = masterPlaylist.next();
        executorService.submit(runnableNextMediaPlayer);
        videoView.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(@NonNull SurfaceHolder surfaceHolder) {
                surfaceCreated = true;
                mediaPlayer.setDisplay(surfaceHolder);
                mediaPlayer.start();
            }

            @Override
            public void surfaceChanged(@NonNull SurfaceHolder surfaceHolder, int i, int i1, int i2) {}

            @Override
            public void surfaceDestroyed(@NonNull SurfaceHolder surfaceHolder) {surfaceCreated = false;}
        });
        FloatingActionButton floatingActionButton = findViewById(R.id.fab);
        floatingActionButton.setOnClickListener(onClickListener);
    }