I have a Google Plus
page
https://plus.google.com/u/0/b/101839105638971401281/101839105638971401281/posts
and an Android application.
Why not just Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
. Android OS queries all Applications that can handle a specific Uri. Google+, as an app, is programmed to be able to handle the Uri you are requesting. So it will show up as an option in a chooser (or just go to it if the user has already selected the Google+ app to be default for that Uri.