You can also try for current Logged In Person like:
Person currentPerson = Plus.PeopleApi.getCurrentPerson(mGoogleApiClient);
System.out.println("ID:\t" + currentPerson.getId());
System.out.println("Display Name:\t" + currentPerson.getDisplayName());
System.out.println("Image URL:\t" + currentPerson.getImage().getUrl());
System.out.println("Profile URL:\t" + currentPerson.getUrl());
before that you must have to initialized mGoogleApiClient:
// [START create_google_api_client]
// Build GoogleApiClient with access to basic profile
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(Plus.API)
.addScope(new Scope(Scopes.PROFILE))
.addScope(new Scope(Scopes.EMAIL))
.build();
// [END create_google_api_client]
Reference Link you can Visit Here.
Thank you.