BuddyPress.org

I postet this question again 6 years ago and got an answer that worked until now:
https://buddypress.org/support/topic/how-can-i-set-show-newblogposts-as-default-on-acitivity-stream/

functions.php:

function blog_posts_by_default( $query_string ) {
global $bp;
if ( !$query_string )
$query_string = '';
if ( ($bp->current_component == BP_ACTIVITY_SLUG || !$bp->current_component) ) {
if ( strpos( $query_string, 'action' ) == 0 )
$query_string .= '&type=new_blog_post&action=new_blog_post';
}
return $query_string;
}
add_filter( 'bp_dtheme_ajax_querystring', 'blog_posts_by_default' );

Now I’m on wp 4.7.1, bp 2.7.4, php 7.0
It doesn’t work anymore. There ist everything of Blogs in the activity stream, not only posts.

I changed the activity loop in this, but this allone doesn’t work.

In child buddypress/activity/index.php

<li id="activity-filter-select" class="last">
				<label for="activity-filter-by"><?php _e( 'Show:', 'buddypress' ); ?></label>
				<select id="activity-filter-by">
					 <option value="new_blog_post" selected><?php _e( 'Posts', 'buddypress' ); ?></option>

					<?php bp_activity_show_filters( 'blogs' ); ?>

Can anybody please post the complete code I need, not just a link to activity loop, because I read any link and still don’t know what I can do now.