title: Show second spinner dialog once first spinner has selected an item, if not then show message
body: <p>I have a form where I have a spinner for state and a spinner for city. I already populate the city spinner when a state has been selected. The issue is to show an error message saying something like "Please choose a state first", when the user tries to choose a city without having chosen a state, without triggering the onitemselected listener. I thought maybe adding/removing the listener depending on whether a state is currently chosen but then how to trigger the error message? any thoughts? thank you.</p>
  
  <p>ps: I tried working with setEnabled and setClickable false but that did not work. </p>