有没有办法使用ListView
而不是ListView.builder
来查找特定项目的索引号?然后我想为列表中的特定项目设置背景。假设每三个项目的背景为红色。
我的列表长度为 10-15 项。
这是我的列表
// List - Words
class WordList extends StatelessWidget {
final List<WordModal> _wordModal;
WordList(this._wordModal);
@override
Widget build(BuildContext context) {
return new ListView(
padding: new EdgeInsets.symmetric(vertical: 8.0),
children: _buildList(),
);
}
List<WordCard> _buildList() {
return _wordModal.map((word) => new WordCard(word)).toList();
}
}
这是我的卡片生成器
// Word Card Item
class WordCard extends StatelessWidget {
final WordModal _genericModal;
WordCard(this._genericModal);
@override
Widget build(BuildContext context) {
return new Card(
margin: new EdgeInsets.symmetric(horizontal: 10.0, vertical: 6.0),
child: Container(
//color: ** want to put background color here **
child: Column(
children: <Widget>[
new ExpansionTile(
title: Container(
child: Column(
children: <Widget>[
new ListTile(
leading: new CircleAvatar(
child: Icon(Icons.image, color: Colors.grey), backgroundColor: Colors.white,),
title: Text(_genericModal.animalGenus),
subtitle: Text(
_genericModal.animalSpecies,
),
),
],
),
),
children: <Widget>[
Row(
children: <Widget>[
SizedBox(
width: 50,
),
Text(
_genericModal.animalHabitatLocation,
style: (TextStyle(fontStyle: FontStyle.italic)),
),
],
),
new Row(
children: <Widget>[
Spacer(),
IconButton(
icon: new Icon(
Icons.volume_up,
size: 28,
color: Colors.grey,
),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => DetailPage()));
}),
],
),
],
),
],
),
));
}
}
最佳答案
这是一些最小的实现
int _selectedIndex;
_onSelected(int index) {
setState(() {
_selectedIndex = index;
});
}
然后在 ListView 中选择要更改颜色的小部件
ListView.builder(
itemCount: querySnapshot.documents.length,
padding: EdgeInsets.all(8.0),
itemBuilder: (context, i) {
...
IconButton(
iconSize: 28,
icon: Icon(
Icons.favorite_border,
color: _selectedIndex != null && _selectedIndex == i
? Colors.redAccent
: Colors.grey,
),
onPressed: () {
_onSelected(i);
关于listview - 如何更改 flutter/dart 中 ListView 项目的背景颜色,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57400382/