bp-admin-notice.php

add_action( 'admin_notices','bp_admin_notices' );
/**
 * Add Admin Notice when BuddyPress is not activated. 
 */
public function  bp_live_admin_notices( ){
	if( ! is_plugin_active('buddypress/bp-loader.php') ){ ?>
		<div class="notice notice-warning is-dismissible">
			<p>
			<?php _e( 'BuddyPress Live Notification required BuddyPress to be activated', 'bp_live_notification' ); ?></p>
		</div>
	<?php }
}