title: Android architecture components liveData and room - what is minimum requirements?
body: <p>I realize its in alpha stage, however I'd like to know if the android architecture components like liveData and room have any minimum requirements ? such as min android api/sdk etc.  I looked <a href="https://developer.android.com/topic/libraries/architecture/adding-components.html" rel="noreferrer">here</a>
  but its not showing me if there is any requirement.  Can i assume i can use this right back to at least android ICS ?</p>