Image.network加载网图报错type ‘Null‘

错误: type 'Null' is not a subtype of type 'List<int>' in type cast

解决方案:使用异步方法,延迟刷新页面

解决效果图:

 关键代码:

        body: RefreshIndicator(
            child: Image.network(
              "http://www.devio.org/img/avatar.png",
              width: 50,
              height: 50,
            ),
            //_asyncRefresh用于实现屏幕下拉时的回调函数
            onRefresh: _asyncRefresh),



Future<Null> _asyncRefresh() async {
    await Future.delayed(Duration(milliseconds: 200));
    return null;
  }

 完整代