Google Plus +1 button inside app?

Hi people!

More information:
If I add:
<allow-navigation href="*" />
to config.xml
This happens when I click the +1 button:

(This means the +1 button doesn't work because is "in an anonymous browser", not authenticated with the OS)

I also created a demo app following this instructions: https://developers.google.com/+/mobile/android/recommend
It works perfectly...

My two possibilites:
1. Some way to make a native Android view with the +1 button appear on the webview.
2. Make a fake +1 button and when it's clicked it calls a plugin that makes some king of request/click on the real +1 button....

Are any of these two possibilities possible?

Thanks for your help!