create-tab-in-group-and-list-products-of-group-admin.php

<?php
/**
 * Create admin product tab at single groups page.
 *
 * @return void
 */
function wbcom_add_admin_product_nav_at_single_group_page() {
	global $bp;
	/* Add some group subnav items */
	$user_access = false;
	$group_link  = '';
	$user_id     = get_current_user_id();
	$group_id    = $bp->groups->current_group->id;
	$user_admin  = groups_is_user_admin( $user_id, $group_id );
	if ( $user_admin ) {
		if ( bp_is_active( 'groups' ) && ! empty( $bp->groups->current_group ) ) {
			$group_link  = $bp->root_domain . '/' . bp_get_groups_root_slug() . '/' . $bp->groups->current_group->slug . '/';
			$user_access = $bp->groups->current_group->user_has_access;
			bp_core_new_subnav_item(
				array(
					'name'            => __( 'Admin Products', 'Admin Products' ),
					'slug'            => 'admin-products',
					'parent_url'      => $group_link,
					'parent_slug'     => $bp->groups->current_group->slug,
					'screen_function' => 'wbcom_display_admin_product_screen',
					'position'        => 50,
					'user_has_access' => $user_access,
					'item_css_id'     => 'admin-products',
				)
			);
		}
	}
}
add_action( 'bp_init', 'wbcom_add_admin_product_nav_at_single_group_page' );

/**
 * Admin Prodcuct tab screens content.
 */
function wbcom_display_admin_product_screen() {
	add_action( 'bp_template_title', 'wbcom_admin_product_show_screen_title' );
	add_action( 'bp_template_content', 'wbcom_admin_show_screen_content' );

	$templates = array( 'groups/single/plugins.php', 'plugin-template.php' );
	if ( strstr( locate_template( $templates ), 'groups/single/plugins.php' ) ) {
		bp_core_load_template( apply_filters( 'bp_core_template_plugin', 'groups/single/plugins' ) );
	} else {
		bp_core_load_template( apply_filters( 'bp_core_template_plugin', 'plugin-template' ) );
	}

}
/**
 * Admin Prodcuct tab title.
 */
function wbcom_admin_product_show_screen_title() {
	echo 'Admins Product';
}
/**
 * Admin Prodcuct tab content.
 */
function wbcom_admin_show_screen_content() {
	global $bp;
	$group_id     = bp_get_group_id();
	$group_admins = groups_get_group_admins( $group_id );
	$admin_id     = $group_admins[0]->user_id;
	$args         = array(
		'post_type'      => 'product',
		'post_status'    => 'publish',
		'posts_per_page' => 12,
		'author'         => $admin_id,
	);
		$loop     = new WP_Query( $args );
	?>
		<div class="author_products">
		<?php if ( $loop->have_posts() ) { ?>
			<ul class="author_pubproducts">
			<?php
			while ( $loop->have_posts() ) :
				$loop->the_post();
				woocommerce_get_template_part( 'content', 'product' );
			endwhile;
			?>
			</ul>
			<?php
		} else {
			echo esc_html_e( 'No products found', 'wbcom-woocommerce' );
		}
			wp_reset_postdata();
}