refresh_indicator

@override
  Widget build(BuildContext context) {
    return new Scaffold(
      key: scaffoldKey,
      appBar: new AppBar(
        title: new Text(
          "Gird view pull refresh",
          style: TextStyle(color: Colors.white),
        ),
      ),
      body: RefreshIndicator(
        key: _refreshIndicatorKey,
        onRefresh: _refresh,
        child: new Stack(
          children: <Widget>[
            _buildSuggestions(),
            _loader(),
          ],
        ),
      ),
    );
  }