我正在尝试使用Flutter和Firestore构建一个应用程序。当使用StreamBuilder从Firestore加载集合以在ListView中显示它时,我得到以下错误 The following assertion was thrown building StreamBuilder}), if ( snapshot.hasData ) {
return ListView
我从Firestore返回的数据有问题。我需要使用Cloud Firestore Plugin获取一些电子邮件: class _EmailPageState extends State<EmailPage> {flutter: The offending widget is: Expanded(flex: 1)
//setSt
当我将StreamBuilder放入RefreshIndicator中时,它会多次使用滚动操作呈现小部件。我想避免太多它,因为StreamBuilder中的图表会有很多次动画效果。$ flutter doctor -v
[✓] Flutter (Channel stable, v1.2.1, on Mac OS X 10.13.6 17G5019, locale en-JP)• Flutter version 1.2.1 at /Users/matsue/w