title: Import primitive types to layout with data binding library
body: <p>I need one separate boolean variable within my item layout, which is intended to use as a row of <code>recyclerView</code>, to toggle the state of some views inside it. </p>
  
  <p>I know, I have got an option to include that boolean into my model class and use that. I am just curious whether it is possible to use primitive types inside layout with the help of data binding library.</p>