public function setup_nav( $main_nav = array(), $sub_nav = array() ) {

		// Determine user to use.
		if ( bp_displayed_user_domain() ) {
			$user_domain = bp_displayed_user_domain();
		} elseif ( bp_loggedin_user_domain() ) {
			$user_domain = bp_loggedin_user_domain();
		} else {
			$user_domain = false;
		}

		// Only grab count if we're on a user page.
		if ( bp_is_user() ) {
			$class = ( 0 === groups_total_groups_for_user( bp_displayed_user_id() ) ) ? 'no-count' : 'count';

			$nav_name = sprintf(
				/* translators: %s: Group count for the current user */
				_x( 'Groups %s', 'Group screen nav with counter', 'buddypress' ),
				sprintf(
					'<span class="%s">%s</span>',
					esc_attr( $class ),
					bp_get_total_group_count_for_user()
				)
			);
		} else {
			$nav_name = _x( 'Groups', 'Group screen nav without counter', 'buddypress' );
		}

		$slug = bp_get_groups_slug();

		// Add 'Groups' to the main navigation.
		$main_nav = array(
			'name'                => $nav_name,
			'slug'                => $slug,
			'position'            => 70,
			'screen_function'     => 'groups_screen_my_groups',
			'default_subnav_slug' => 'my-groups',
			'item_css_id'         => $this->id
		);

		if ( ! empty( $user_domain ) ) {
			$access      = bp_core_can_edit_settings();
			$groups_link = trailingslashit( $user_domain . $slug );

			// Add the My Groups nav item.
			$sub_nav[] = array(
				'name'            => __( 'Memberships', 'buddypress' ),
				'slug'            => 'my-groups',
				'parent_url'      => $groups_link,
				'parent_slug'     => $slug,
				'screen_function' => 'groups_screen_my_groups',
				'position'        => 10,
				'item_css_id'     => 'groups-my-groups'
			);

			// Add the Group Invites nav item.
			$sub_nav[] = array(
				'name'            => __( 'Invitations', 'buddypress' ),
				'slug'            => 'invites',
				'parent_url'      => $groups_link,
				'parent_slug'     => $slug,
				'screen_function' => 'groups_screen_group_invites',
				'user_has_access' => $access,
				'position'        => 30
			);

			parent::setup_nav( $main_nav, $sub_nav );
		}

		if ( bp_is_groups_component() && bp_is_single_item() ) {

			// Reset sub nav.
			$sub_nav = array();

			/*
			 * The top-level Groups item is called 'Memberships' for legacy reasons.
			 * It does not appear in the interface.
			 */
			bp_core_new_nav_item( array(
				'name'                => __( 'Memberships', 'buddypress' ),
				'slug'                => $this->current_group->slug,
				'position'            => -1, // Do not show in BuddyBar.
				'screen_function'     => 'groups_screen_group_home',
				'default_subnav_slug' => $this->default_extension,
				'item_css_id'         => $this->id
			), 'groups' );

			$group_link = bp_get_group_permalink( $this->current_group );

			// Add the "Home" subnav item, as this will always be present.
			$sub_nav[] = array(
				'name'            =>  _x( 'Home', 'Group screen navigation title', 'buddypress' ),
				'slug'            => 'home',
				'parent_url'      => $group_link,
				'parent_slug'     => $this->current_group->slug,
				'screen_function' => 'groups_screen_group_home',
				'position'        => 10,
				'item_css_id'     => 'home'
			);

			// If this is a private group, and the user is not a
			// member and does not have an outstanding invitation,
			// show a "Request Membership" nav item.
			if ( bp_current_user_can( 'groups_request_membership', array( 'group_id' => $this->current_group->id ) ) ) {

				$sub_nav[] = array(
					'name'            => _x( 'Request Membership','Group screen nav', 'buddypress' ),
					'slug'            => 'request-membership',
					'parent_url'      => $group_link,
					'parent_slug'     => $this->current_group->slug,
					'screen_function' => 'groups_screen_group_request_membership',
					'position'        => 30
				);
			}

			if ( $this->current_group->front_template || bp_is_active( 'activity' ) ) {
				/**
				 * If the theme is using a custom front, create activity subnav.
				 */
				if ( $this->current_group->front_template && bp_is_active( 'activity' ) ) {
					$sub_nav[] = array(
						'name'            => _x( 'Activity', 'My Group screen nav', 'buddypress' ),
						'slug'            => 'activity',
						'parent_url'      => $group_link,
						'parent_slug'     => $this->current_group->slug,
						'screen_function' => 'groups_screen_group_activity',
						'position'        => 11,
						'user_has_access' => $this->current_group->user_has_access,
						'item_css_id'     => 'activity',
						'no_access_url'   => $group_link,
					);
				}

				/**
				 * Only add the members subnav if it's not the home's nav.
				 */
				$sub_nav[] = array(
					'name'            => sprintf( _x( 'Members %s', 'My Group screen nav', 'buddypress' ), '<span>' . number_format( $this->current_group->total_member_count ) . '</span>' ),
					'slug'            => 'members',
					'parent_url'      => $group_link,
					'parent_slug'     => $this->current_group->slug,
					'screen_function' => 'groups_screen_group_members',
					'position'        => 60,
					'user_has_access' => $this->current_group->user_has_access,
					'item_css_id'     => 'members',
					'no_access_url'   => $group_link,
				);
			}

			if ( bp_is_active( 'friends' ) && bp_groups_user_can_send_invites() ) {
				$sub_nav[] = array(
					'name'            => _x( 'Send Invites', 'My Group screen nav', 'buddypress' ),
					'slug'            => 'send-invites',
					'parent_url'      => $group_link,
					'parent_slug'     => $this->current_group->slug,
					'screen_function' => 'groups_screen_group_invite',
					'item_css_id'     => 'invite',
					'position'        => 70,
					'user_has_access' => $this->current_group->user_has_access,
					'no_access_url'   => $group_link,
				);
			}

			// If the user is a group admin, then show the group admin nav item.
			if ( bp_is_item_admin() ) {
				$sub_nav[] = array(
					'name'            => _x( 'Manage', 'My Group screen nav', 'buddypress' ),
					'slug'            => 'admin',
					'parent_url'      => $group_link,
					'parent_slug'     => $this->current_group->slug,
					'screen_function' => 'groups_screen_group_admin',
					'position'        => 1000,
					'user_has_access' => true,
					'item_css_id'     => 'admin',
					'no_access_url'   => $group_link,
				);

				$admin_link = trailingslashit( $group_link . 'admin' );

				// Common params to all nav items.
				$default_params = array(
					'parent_url'        => $admin_link,
					'parent_slug'       => $this->current_group->slug . '_manage',
					'screen_function'   => 'groups_screen_group_admin',
					'user_has_access'   => bp_is_item_admin(),
					'show_in_admin_bar' => true,
				);

				$sub_nav[] = array_merge( array(
					'name'     => __( 'Details', 'buddypress' ),
					'slug'     => 'edit-details',
					'position' => 0,
				), $default_params );

				$sub_nav[] = array_merge( array(
					'name'     => __( 'Settings', 'buddypress' ),
					'slug'     => 'group-settings',
					'position' => 10,
				), $default_params );

				if ( ! bp_disable_group_avatar_uploads() && buddypress()->avatar->show_avatars ) {
					$sub_nav[] = array_merge( array(
						'name'     => __( 'Photo', 'buddypress' ),
						'slug'     => 'group-avatar',
						'position' => 20,
					), $default_params );
				}

				if ( bp_group_use_cover_image_header() ) {
					$sub_nav[] = array_merge( array(
						'name'     => __( 'Cover Image', 'buddypress' ),
						'slug'     => 'group-cover-image',
						'position' => 25,
					), $default_params );
				}

				$sub_nav[] = array_merge( array(
					'name'     => __( 'Members', 'buddypress' ),
					'slug'     => 'manage-members',
					'position' => 30,
				), $default_params );

				if ( 'private' == $this->current_group->status ) {
					$sub_nav[] = array_merge( array(
						'name'     => __( 'Requests', 'buddypress' ),
						'slug'     => 'membership-requests',
						'position' => 40,
					), $default_params );
				}

				$sub_nav[] = array_merge( array(
					'name'     => __( 'Delete', 'buddypress' ),
					'slug'     => 'delete-group',
					'position' => 1000,
				), $default_params );
			}

			foreach ( $sub_nav as $nav ) {
				bp_core_new_subnav_item( $nav, 'groups' );
			}
		}

		if ( isset( $this->current_group->user_has_access ) ) {

			/**
			 * Fires at the end of the groups navigation setup if user has access.
			 *
			 * @since 1.0.2
			 *
			 * @param bool $user_has_access Whether or not user has access.
			 */
			do_action( 'groups_setup_nav', $this->current_group->user_has_access );
		} else {

			/** This action is documented in bp-groups/bp-groups-loader.php */
			do_action( 'groups_setup_nav');
		}
	}