title: Downloading pdf file using OKHTTP
body: <p>I am using ok-http in my android application.</p>
  
  <p>I have url of .pdf file which is coming from web-service.</p>
  
  <p>I have to download pdf file on click event of ImageView. I have searched it on google but, couldn't find specific answer.</p>
  
  <p>Please, provide me solution if anyone knows about it.
  Thanks.</p>