为了避免警报对话解除颤动

代码示例

alertdialog扑按外disappera

showDialog(
  barrierDismissible: true,
)

-1

扑显示警告对话后服务器的错误

Provider.of<NewsProvider>(context, listen: false)
.fetchAndSetNewsList()
.catchError((error) => showDialog(context: context, builder: (context) {
   return new SimpleDialog(
       children: <Widget>[
            new Center(child: new Container(child: new Text('foo')))
       ]);
}))

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