title: Error: java.lang.UnsupportedOperationException while generating APK
body: <p>I was following this tutorial: <a href="https://developers.google.com/chrome/mobile/docs/webview/gettingstarted" rel="nofollow">https://developers.google.com/chrome/mobile/docs/webview/gettingstarted</a>
  and I wanted to generate the .apk so I could test it on my android phone.</p>
  
  <p>I read here on stack overflow that to export the project to an apk we should go to <strong>Build > Generate Signed APK</strong> but I get the following error:</p>
  
  <p><em>java.lang.UnsupportedOperationException</em> </p>
  
  <p>So I can't get my APK.
  Can anybody Help me with this problem? </p>