public void Update(List <Package> packages)
        {
            this.packages.Clear();
            this.packages.AddRange(packages);

            adapter.NotifyDataSetChanged();
        }
        void UpdatePackages()
        {
            if (packageAdapter == null)
            {
                return;
            }

            RunOnUiThread(delegate
            {
                packageArray.Clear();
                packageArray.AddRange(Packages);
                packageAdapter.NotifyDataSetChanged();
            });
        }