public class MainActivity extends AppCompatActivity {

    private StyledPlayerView playerView;
    private ExoPlayer player;

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

        playerView = findViewById(R.id.video_view);

        MediaItem.Builder mediaItemBuilder = new MediaItem.Builder()
                .setUri(getIntent().getData())
                .setMimeType(getIntent().getType());

        player = new ExoPlayer.Builder(this)
                .build();

        playerView.setPlayer(player);

        player.setMediaItem(mediaItemBuilder.build());

        player.prepare();
    }
}