Buddypress custom posts on activity stream.

gistfile1.php

/*
** Put this in your ( for example ) functions.php file.
** Credits
** http://pastebin.com/qrfjCat8
** http://premium.wpmudev.org/forums/topic/how-to-add-custom-posts-types-in-buddypress-activity
*/

function custom_record_activity( $post_id, $post, $user_id = false ) {
	
	global $bp, $wpdb;
	
	//check for multisite install
	if(!is_multisite()) return false;
	
	$post_id = (int)$post_id;
	$blog_id = (int)$wpdb->blogid;
	
	if ( !$user_id )
		$user_id = (int)$post->post_author;
	
	/* This is to stop infinite loops with Donncha's sitewide tags plugin */
	if ( (int)$bp->site_options['tags_blog_id'] == (int)$blog_id ) return false;
	
	/* Don't record this if it's a regular post */
	if ( $post->post_type == 'post' ) return false;
	
	if ( ( 'publish' == $post->post_status ) && ( '' == $post->post_password ) ) {
		
		if ( (int)get_blog_option( $blog_id, 'blog_public' ) || !bp_core_is_multisite() ) {
			
			/* Record this in activity streams */
			$post_permalink = get_permalink( $post_id );
	
			$activity_action = sprintf( __( '%1$s wrote a new post, %2$s, on the site %3$s', 'buddypress' ), bp_core_get_userlink( (int)$post->post_author ), '<a href="' . $post_permalink . '">' . $post->post_title . '</a>', get_blog_option($blog_id, 'blogname') );
			$activity_content = $post->post_content;
	
			bp_blogs_record_activity( array(
				'user_id' => (int)$post->post_author,
				'action' => apply_filters( 'bp_blogs_activity_new_post_action', $activity_action, &$post, $post_permalink ),
				'content' => apply_filters( 'bp_blogs_activity_new_post_content', $activity_content, &$post, $post_permalink ),
				'primary_link' => apply_filters( 'bp_blogs_activity_new_post_primary_link', $post_permalink, $post_id ),
				'type' => 'new_blog_post',
				'item_id' => $blog_id,
				'secondary_item_id' => $post_id,
				'recorded_time' => $post->post_date_gmt
			));
		}
	} else
		bp_blogs_remove_post( $post_id, $blog_id );
	
	bp_blogs_update_blogmeta( $blog_id, 'last_activity', bp_core_current_time() );
	
	do_action( 'bp_blogs_new_blog_post', $post_id, $post, $user_id );
}
	 
add_action( 'save_post', 'custom_record_activity', 10, 2 );