Url change

    function _bp_core_get_user_domain($domain, $user_id, $user_nicename = false, $user_login = false) {
        if ( empty( $user_id ) ){
            return;
        }
        if( isset($user_nicename) ){
            $user_nicename = bp_core_get_username($user_id);
        }
        $after_domain =  bp_get_members_root_slug() . '/' . $user_id;

        $domain = trailingslashit( bp_get_root_domain() . '/' . $after_domain );
        $domain = apply_filters( 'bp_core_get_user_domain_pre_cache', $domain, $user_id, $user_nicename, $user_login );
        if ( !empty( $domain ) ) {
            wp_cache_set( 'bp_user_domain_' . $user_id, $domain, 'bp' );
        }
        return $domain;
    }

    add_filter('bp_core_get_user_domain', '_bp_core_get_user_domain', 10, 4);

    function _bp_core_get_userid($userid, $username){
        if(is_numeric($username)){
            $aux = get_userdata( $username );
            if( get_userdata( $username ) )
                $userid = $username;
        }
        return $userid;
    }

    add_filter('bp_core_get_userid', '_bp_core_get_userid', 10, 2);

    function _bp_get_activity_parent_content($content){
        global $bp;
        $user = get_user_by('slug', $bp->displayed_user->fullname); // 'slug' - user_nicename
        return preg_replace('/href=\"(.*?)\"/is', 'href="'.bp_core_get_user_domain($user->ID, $bp->displayed_user->fullname).'"', $content);
    }

    add_filter( 'bp_get_activity_parent_content','_bp_get_activity_parent_content', 10, 1 );

    add_filter('bp_core_get_userid_from_nicename', '_bp_core_get_userid', 10, 2);