Question: There is already a good SO question for displaying a Google+ Page in the Google+ Android app:

[Open Google Plus Page Via Intent In Android](https://stackoverflow.com/questions/11867989/open-google-plus-page-via-intent-in-android)

But what about the Intent to launch the Google+ app at a specific Google+ Community?

EDIT - to the silent down-voters, please explain why you down-voted.

Answer: 
My solution, working with G+ version "5.3.0.91034052", tested today

```
final Intent intent = new Intent( Intent.ACTION_VIEW, Uri.parse( "https://plus.google.com/communities/107847486351510098159" ) );
intent.setPackage( "com.google.android.apps.plus" );
if (intent.resolveActivity(getPackageManager()) != null) { 
    startActivity( intent );
}

```

It's not bullet proof, you need Google+ app on your device, in case you don't have it some kind of try-catch might be nice (?),
I achieved this by using: 

```
String communityPage = "communities/123456789";
    try {
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setClassName("com.google.android.apps.plus",
                "com.google.android.apps.plus.phone.UrlGatewayActivity");
        intent.putExtra("customAppUri", communityPage);
        startActivity(intent);
        } catch(ActivityNotFoundException e) {
            // fallback if G+ app is not installed
            startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://plus.google.com/"+communityPage)));
        }

```

Where 123456789 is the id of the community copied from the address bar.