title: Android spinner does not have ripple on button itself, just its options
body: <p>I can't seem to get the pressed state ripple to work on a Spinner. The individual drop down items have the ripple, but not the spinner itself. I thought maybe this was expected behavior, but this animation from the material design guidelines clearly shows the spinner with a pressed state ripple before the options drop dropdown appears.</p>
  
  <p><a href="https://material-design.storage.googleapis.com/publish/material_v_4/material_ext_publish/0B3321sZLoP_HTS1LdnhrTl9TRzg/components-buttons-otherbuttons-060203_MobileDropdowns_xhdpi_006.webm">https://material-design.storage.googleapis.com/publish/material_v_4/material_ext_publish/0B3321sZLoP_HTS1LdnhrTl9TRzg/components-buttons-otherbuttons-060203_MobileDropdowns_xhdpi_006.webm</a></p>