code: @Override
      public void onClick(View v) {
          if (v.getId() == R.id.vcv_img_play) {
              if (isPlaying()) {
                  pause();
              } else {
                  start();
              }
          } else {
              setFullscreen(!isFullscreen());
          }
      }
docs: Onclick action
  Controls play button and fullscreen button.
  
  @param v View defined in XML