you can use get_queried_object, as get_post_type
does not work on custom post type (I don’t know yet why, more info here)
$obj = get_queried_object();
$custom_post_type = $obj->post_type;
then you can proceed with
if($custom_post_type == "type1"){
// do something
} else {
// etc..
}
I’ve tested this in one of the sites I’m working on, I hope it work on yours too..
EDIT:
here is the new code that you can use for archives too:
global $wp_query;
if (is_archive()):
$custom_post_type = get_query_var('post_type');
$custom_taxonomy = get_query_var('taxonomy');
else:
$obj = get_queried_object();
$custom_post_type = $obj->post_type;
endif;
I’ve added a taxonomy type too in case you would need one yourself.