code: @Override
  	public boolean isAvailableOnDevice(Context context) {
  		try {
  			context.getPackageManager().getPackageInfo(PLUS_PACKAGE, 0);
  			return true;
  		}
  		catch (NameNotFoundException e) {
  			return false;
  		}
  	}
docs: /* (non-Javadoc)
  @see com.socialize.share.ShareHandler#isAvailableOnDevice(android.content.Context)