flutter-listview

问题 I am able to fetch the JSON data successfully, but not able to fetch the fields of JSON data and build a list in flutter. This is the code I am using to fetch the field data OrderModel.fromJson(Map<String, dynamic> json) { error = json['error']; if (json['content'] != null) { content = new List<OrderContent>(); json['content'].forEach((v) { content.add(new OrderContent.fromJson(v)); }); } } The json['content'] is Map<String, dynamic> . In .forEach((v) what should I write to get the data? I am

问题 @override Widget build(BuildContext context) { super.build(context); SystemChrome.setEnabledSystemUIOverlays(SystemUiOverlay.values); return AnnotatedRegion<SystemUiOverlayStyle>( value: SystemUiOverlayStyle( statusBarColor: Colors.transparent, ), child: Scaffold( key: _scaffoldKeyProfilePage, body: DefaultTabController( length: 2, child:RefreshIndicator( onRefresh: _onRefresh, child: NestedScrollView( headerSliverBuilder: (context, _) { return [ SliverList( delegate: SliverChildListDelegate(

问题 @override Widget build(BuildContext context) { super.build(context); SystemChrome.setEnabledSystemUIOverlays(SystemUiOverlay.values); return AnnotatedRegion<SystemUiOverlayStyle>( value: SystemUiOverlayStyle( statusBarColor: Colors.transparent, ), child: Scaffold( key: _scaffoldKeyProfilePage, body: DefaultTabController( length: 2, child:RefreshIndicator( onRefresh: _onRefresh, child: NestedScrollView( headerSliverBuilder: (context, _) { return [ SliverList( delegate: SliverChildListDelegate(

问题 @override Widget build(BuildContext context) { super.build(context); SystemChrome.setEnabledSystemUIOverlays(SystemUiOverlay.values); return AnnotatedRegion<SystemUiOverlayStyle>( value: SystemUiOverlayStyle( statusBarColor: Colors.transparent, ), child: Scaffold( key: _scaffoldKeyProfilePage, body: DefaultTabController( length: 2, child:RefreshIndicator( onRefresh: _onRefresh, child: NestedScrollView( headerSliverBuilder: (context, _) { return [ SliverList( delegate: SliverChildListDelegate(

来源： https://stackoverflow.com/questions/56113174/how-to-deselect-the-already-selected-item-after-tap-on-another-item-listview-in

来源： https://stackoverflow.com/questions/63650400/need-to-configure-the-json-data-fetched-fields-to-the-widget-elements-in-flutter

问题 I have a listview . I want to go to a certain widget by it's corresponding index number. I've tried with ScrollController, but it need offset value to jumpTo the index. But I want to jumpTo a widget by using its index number. Please, help me to fix it Thanks in advance. 回答1: Unfortunately, ListView has no built-in approach to a scrollToIndex() function. You’ll have to develop your own way to measure to that element’s offset for animateTo() or jumpTo() , or you can search through suggested

问题 My custom widget code: class CustomWidget extends StatefulWidget { final int index; final String value; final bool isSelected; final VoidCallback onSelect; const CustomWidget({ Key key, @required this.index, @required this.value, @required this.isSelected, @required this.onSelect, }) : assert(index != null), assert(value != null), assert(isSelected != null), assert(onSelect != null), super(key: key); @override _CustomWidgetState createState() => _CustomWidgetState(); } class

问题 My custom widget code: class CustomWidget extends StatefulWidget { final int index; final String value; final bool isSelected; final VoidCallback onSelect; const CustomWidget({ Key key, @required this.index, @required this.value, @required this.isSelected, @required this.onSelect, }) : assert(index != null), assert(value != null), assert(isSelected != null), assert(onSelect != null), super(key: key); @override _CustomWidgetState createState() => _CustomWidgetState(); } class

问题 I have a screen with Text widgets and ListView, and when I try to scroll inside the ListView, it doesn't allow me to scroll. My body is SingleChildScrollView but that doesn't provide scrollView for the ListView.builder. I tried to wrap the ListView.build inside Expanded, but didn't work out. class HomePageState extends State<HomePage> { @override Widget build(BuildContext context) { return Scaffold( appBar: new AppBar( title: Text("MyBar"), centerTitle: true, ), body: SingleChildScrollView