BuddyPress.org

add new function in wp-core-avatars.php ->

function bp_core_get_avatar_url( $user, $version = 1, $width = null, $height = null, $no_tag = false ) {

global $bp, $current_blog;



if ( !is_int($version) )

$version = (int) $version;



if ( CORE_AVATAR_V2_W == false && CORE_AVATAR_V2_H == false )

$version = 1;



if ( !$width )

$width = constant('CORE_AVATAR_V' . $version . '_W');



if ( !$height )

$height = constant('CORE_AVATAR_V' . $version . '_H');



$avatar_file = get_usermeta( $user, "bp_core_avatar_v$version" );

$url = $bp['root_domain'] . '/' . $avatar_file;



if ( strlen($avatar_file) ) {

if ( $no_tag )

return $url;

else

return $url;

} else {

$ud = get_userdata($user);

$grav_option = get_site_option('user-avatar-default');



if ( $grav_option == '' ) {

$default_grav = 'wavatar';

} else if ( $grav_option == 'mystery' ) {

$default_grav = site_url('wp-content/mu-plugins/bp-core/images/mystery-man.jpg');

} else {

$default_grav = $grav_option;

}



$gravatar = 'https://secure.gravatar.com/avatar/' . md5( $ud->user_email ) . '?d=' . $default_grav . '&s=';

if ( $no_tag )

return $gravatar . constant('CORE_AVATAR_V' . $version . '_W');

else

return $gravatar . constant('CORE_AVATAR_V' . $version . '_W');

}

}

and use bp_core_get_avatar_url(user_id_here,1)