bp_update_activity_feed_of_custom_post_type( $post_id,  $post,  $update )

function bp_update_activity_feed_of_custom_post_type( $post_id, $post, $update ) {

	// check is WP_Post if not then return
	if ( ! is_a( $post, 'WP_Post' ) ) {
		return;
	}

	if ( 'post' === $post->post_type ) {
		return;
	}

	$enabled = bp_is_post_type_feed_enable( $post->post_type );

	// If enabled update the activity.
	if ( $enabled  ) {

		// Get the post type tracking args.
		$activity_post_object = bp_activity_get_post_type_tracking_args( $post->post_type );

		if ( empty( $activity_post_object->action_id ) ) {
			return;
		}

		// Get the existing activity id based on the post.
		$activity_id = bp_activity_get_activity_id( array(
			'component'         => $activity_post_object->component_id,
			'item_id'           => get_current_blog_id(),
			'secondary_item_id' => $post->ID,
			'type'              => $activity_post_object->action_id,
		) );

		// Activity ID doesn't exist, so stop!
		if ( empty( $activity_id ) ) {
			return;
		}

		// Delete the activity if the post was updated with a password.
		if ( ! empty( $post->post_password ) ) {
			bp_activity_delete( array( 'id' => $activity_id ) );
		}

		// Update the activity entry.
		$activity = new BP_Activity_Activity( $activity_id );

		// get the excerpt first of post.
		$excerpt = get_the_excerpt( $post->ID );

		// if excert found then take content as a excerpt otherwise take the content as a post content.
		$content = ( $excerpt ) ?: $post->post_content;

		// If content not empty.
		if ( ! empty( $content ) ) {
			$activity_summary = bp_activity_create_summary( $content, (array) $activity );

			$src = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'full', false );

			if ( isset( $src[0] ) ) {
				$activity_summary .= sprintf( ' <img src="%s">', esc_url( $src[0] ) );
			}
			// Backward compatibility filter for the blogs component.
			if ( 'blogs' == $activity_post_object->component_id ) {
				$activity->content = apply_filters( 'bp_update_activity_feed_of_custom_post_content',
					$activity_summary,
					$content,
					(array) $activity,
					$post->post_type );
			} else {
				$activity->content = $activity_summary;
			}
		} else {

			$src              = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'full', false );
			$activity_summary = '';
			if ( isset( $src[0] ) ) {
				$activity_summary = sprintf( ' <img src="%s">', esc_url( $src[0] ) );
			}

			// Backward compatibility filter for the blogs component.
			if ( 'blogs' == $activity_post_object->component_id ) {
				$activity->content = apply_filters( 'bp_update_activity_feed_of_custom_post_content',
					$activity_summary,
					$post->post_content,
					(array) $activity,
					$post->post_type );
			} else {
				$activity->content = $activity_summary;
			}
		}

		// Save the updated activity.
		$updated = $activity->save();

	}

}