title: Android form validation UI library
body: <p>There is iOS <a href="https://github.com/ustwo/US2FormValidator" rel="noreferrer">US2FormValidator</a> library for user input validation (see the picture below). I think that library is better than the default of just popping an alert when something doesn't validate.</p>
  
  <p><img src="https://i.stack.imgur.com/G9Wx9.png" alt="US2FormValidator Preview"></p>
  
  <p>I'm looking for how to do such things on Android. Are there some Android analogs of <a href="https://github.com/ustwo/US2FormValidator" rel="noreferrer">US2FormValidator</a>?</p>