code: private void initializeDraggablePanel() {
      draggablePanel.setFragmentManager(getSupportFragmentManager());
      draggablePanel.setTopFragment(youtubeFragment);
      MoviePosterFragment moviePosterFragment = new MoviePosterFragment();
      moviePosterFragment.setPoster(VIDEO_POSTER_THUMBNAIL);
      moviePosterFragment.setPosterTitle(VIDEO_POSTER_TITLE);
      draggablePanel.setBottomFragment(moviePosterFragment);
      draggablePanel.initializeView();
      Picasso.with(this)
          .load(SECOND_VIDEO_POSTER_THUMBNAIL)
          .placeholder(R.drawable.xmen_placeholder)
          .into(thumbnailImageView);
    }
docs: Initialize and configure the DraggablePanel widget with two fragments and some attributes.