title: Square`s OkHttp. Download progress
body: <p>Is there any way to get downloading file progress when using square`s <a href="http://square.github.io/okhttp/">OkHttp</a>?</p>
  
  <p>I did not find any solution in <a href="https://github.com/square/okhttp/wiki/Recipes">Recipes</a>.</p>
  
  <p>They have class <a href="http://square.github.io/okhttp/javadoc/com/squareup/okhttp/Call.html">Call</a> which can get content asynchronically, but there is no method to get current progress.</p>