Flutter 如何遍历地图列表并在FlatterListView中显示文本小部件？
我对flatter非常陌生，我试图通过内容列表中的for循环显示listview，但我能够打印一个列表行，这是一次迭代，因为返回只触发一次。如何遍历完整列表并显示所有listview元素？ 以下是地图内容列表Flutter 如何遍历地图列表并在FlatterListView中显示文本小部件？,flutter,listview,dart,widget,Flutter,Listview,Dart,Widget,我对flatter非常陌生，我试图通过内容列表中的for循环显示listview，但我能够打印一个列表行，这是一次迭代，因为返回只触发一次。如何遍历完整列表并显示所有listview元素？ 以下是地图内容列表 List<Map<String, String>> users = [ {"name": "Staff 1", "status": "Online"}, {"
List<Map<String, String>> users = [
{"name": "Staff 1", "status": "Online"},
{"name": "Staff 2", "status": "Online"},
{"name": "Staff 3", "status": "Offline"},
{"name": "Vehicle 1", "status": "Available"},
{"name": "Vehicle 2", "status": "Unavailable"},
{"name": "Team 1", "status": "Active"},
{"name": "Team 2", "status": "Not Active"},
];
列出用户=[
{“姓名”：“员工1”，“状态”：“在线”}，
{“姓名”：“员工2”，“状态”：“在线”}，
{“姓名”：“职员3”，“状态”：“脱机”}，
{“名称”：“车辆1”，“状态”：“可用”}，
{“名称”：“车辆2”，“状态”：“不可用”}，
{“名称”：“团队1”，“状态”：“活动”}，
{“名称”：“团队2”，“状态”：“未激活”}，
];
Widget ListViewBuilder() {
for (var i = 0; i < users.length; i++) {
print(i);
return Expanded(
child: ListView(
children: <Widget>[
GestureDetector(
onTap: () {
Navigator.pushNamed(
context,
'/chatscreen',
);
},
child: ListTile(
leading: CircleAvatar(
radius: 20,
backgroundImage: AssetImage("assets/profileavatar.png")),
title: Text(users[i]['name']),
subtitle: Text("User -ID"),
trailing: Row(
mainAxisAlignment:
MainAxisAlignment.spaceBetween, // added line
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text(
users[i]['status'],
style: TextStyle(
color: Colors.green,
fontSize: 20,
),
),
],
),
);
}
}
Widget ListViewBuilder（）{
对于（var i=0；i这将只显示列表中的第一个元素，如何实现显示列表用户中的所有listview元素？任何建议都会很有帮助这里的问题是-您将在第一个循环中返回结果。这就是为什么您只获得列表中的第一个元素 您需要在ListView小部件中遍历地图
List<Map<String, String>> users = [
{"name": "Staff 1", "status": "Online"},
{"name": "Staff 2", "status": "Online"},
{"name": "Staff 3", "status": "Offline"},
{"name": "Vehicle 1", "status": "Available"},
{"name": "Vehicle 2", "status": "Unavailable"},
{"name": "Team 1", "status": "Active"},
{"name": "Team 2", "status": "Not Active"},
];
Widget ListViewBuilder(BuildContext context) {
return Expanded(
child: ListView(
children: <Widget>[
...users.map( (u) =>
<Widget> [GestureDetector(
onTap: () {
Navigator.pushNamed(
context,
'/chatscreen',
);
},
child: ListTile(
leading: CircleAvatar(
radius: 20,
backgroundImage: AssetImage("assets/profileavatar.png")),
title: Text(u['name']),
subtitle: Text("User -ID"),
trailing: Row(
mainAxisAlignment:
MainAxisAlignment.spaceBetween, // added line
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text(
u['status'],
style: TextStyle(
color: Colors.green,
fontSize: 20,
),
),
SizedBox(
width: 20,
),
InkWell(
onTap: () {
Navigator.pushNamed(
context,
'/viewlocation',
);
},
child: Icon(
Icons.add_location,
color: Colors.green,
size: 40,
),
),
SizedBox(
width: 20,
),
Container(
decoration: BoxDecoration(
color: Colors.green,
border: Border.all(
color: Colors.green,
),
borderRadius:
BorderRadius.all(Radius.circular(20))),
child: InkWell(
onTap: () async {
const number =
'08592119XXXX'; //set the number here
bool res =
await FlutterPhoneDirectCaller.callNumber(
number);
},
child: Icon(
Icons.call,
color: Colors.white,
size: 40,
),
),
)
])),
),
Divider(
color: Colors.black,
endIndent: 10,
indent: 10,
)
]).expand((element) => element).toList()
,
],
),
);
}
列出用户=[
{“姓名”：“员工1”，“状态”：“在线”}，
{“姓名”：“员工2”，“状态”：“在线”}，
{“姓名”：“职员3”，“状态”：“脱机”}，
{“名称”：“车辆1”，“状态”：“可用”}，
{“名称”：“车辆2”，“状态”：“不可用”}，
{“名称”：“团队1”，“状态”：“活动”}，
{“名称”：“团队2”，“状态”：“未激活”}，
];
小部件ListViewBuilder（构建上下文）{
扩大回报(
子：ListView(
儿童：[
…用户.map（（u）=>
[手势检测器(
onTap:（）{
Navigator.pushNamed(
上下文
“/chatscreen”，
);
},
孩子：ListTile(
领先：CircleAvatar(
半径：20，
背景图片：AssetImage（“assets/profileavatar.png”），
标题：文本（u['name']），
字幕：文本（“用户ID”），
尾随：行(
主轴对准：
MainAxisAlignment.spaceBetween，//添加了行
mainAxisSize:mainAxisSize.min，
儿童：[
正文(
u[“状态”]，
样式：TextStyle(
颜色：颜色。绿色，
尺寸：20，
),
),
大小盒子(
宽度：20，
),
墨水池(
onTap:（）{
Navigator.pushNamed(
上下文
“/viewlocation”，
);
},
子：图标(
Icons.add_位置，
颜色：颜色。绿色，
尺码：40，
),
),
大小盒子(
宽度：20，
),
容器(
装饰：盒子装饰(
颜色：颜色。绿色，
边界：边界(
颜色：颜色。绿色，
),
边界半径：
边界半径所有（半径圆形（20）），
孩子：InkWell(
onTap:（）异步{
常数=
“08592119XXXX”；//在此处设置数字
布尔雷斯酒店=
等待PhoneDirectCaller.callNumber(
数量）；
},
子：图标(
图标。呼叫，
颜色：颜色，白色，
尺码：40，
),
),
)
])),
),
分隔器(
颜色：颜色，黑色，
结束缩进：10，
缩进：10，
)
]).expand（（元素）=>元素）.toList（）
,
],
),
);
child: ListView(
children: <Widget>[
[GestureDetector, Divider, GestureDetector, Divider]]
child: ListView(
children: <Widget>[
GestureDetector, Divider, GestureDetector, Divider]
Widget listViewBuilder() {
return Expanded(
child: ListView.separated(
itemCount: users.length,
itemBuilder: (context, i) {
return GestureDetector(
onTap: () {
Navigator.pushNamed(
context,
'/chatscreen',
);
},
child: ListTile(
leading: CircleAvatar(
radius: 20,
backgroundImage:
AssetImage("assets/profileavatar.png")),
title: Text(users[i]['name']),
subtitle: Text("User -ID"),
trailing: Row(
mainAxisAlignment:
MainAxisAlignment.spaceBetween, // added line
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text(
users[i]['status'],
style: TextStyle(
color: Colors.green,
fontSize: 20,
),
),
SizedBox(
width: 20,
),
InkWell(
onTap: () {
Navigator.pushNamed(
context,
'/viewlocation',
);
},
child: Icon(
Icons.add_location,
color: Colors.green,
size: 40,
),
),
SizedBox(
width: 20,
),
Container(
decoration: BoxDecoration(
color: Colors.green,
border: Border.all(
color: Colors.green,
),
borderRadius:
BorderRadius.all(Radius.circular(20))),
child: InkWell(
onTap: () async {
const number =
'08592119XXXX'; //set the number here
bool res =
await FlutterPhoneDirectCaller.callNumber(
number);
},
child: Icon(
Icons.call,
color: Colors.white,
size: 40,
),
),
)
])),
);
},
separatorBuilder: (BuildContext context, int index) {
return Divider(
color: Colors.black,
endIndent: 10,
indent: 10,
);
}));
}
class CustomListTile extends StatelessWidget {
final String name, status;
const CustomListTile({Key key, this.name, this.status}) : super(key: key);
@override
Widget build(BuildContext context) {
return GestureDetector(
onTap: () {
Navigator.pushNamed(
context,
'/chatscreen',
);
},
child: ListTile(
leading: CircleAvatar(
radius: 20,
backgroundImage: AssetImage("assets/profileavatar.png")),
title: Text(name),
subtitle: Text("User -ID"),
trailing: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween, // added line
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text(
status,
style: TextStyle(
color: Colors.green,
fontSize: 20,
),
),
SizedBox(
width: 20,
),
InkWell(
onTap: () {
Navigator.pushNamed(
context,
'/viewlocation',
);
},
child: Icon(
Icons.add_location,
color: Colors.green,
size: 40,
),
),
SizedBox(
width: 20,
),
Container(
decoration: BoxDecoration(
color: Colors.green,
border: Border.all(
color: Colors.green,
),
borderRadius: BorderRadius.all(Radius.circular(20))),
child: InkWell(
onTap: () async {
const number = '08592119XXXX'; //set the number here
// bool res = await FlutterPhoneDirectCaller.callNumber(number);
},
child: Icon(
Icons.call,
color: Colors.white,
size: 40,
),
),
)
],
),
),
);
}
}
class DemoPage extends StatelessWidget {
DemoPage({
Key key,
}) : super(key: key);
final List<Map<String, String>> users = [
{"name": "Staff 1", "status": "Online"},
{"name": "Staff 2", "status": "Online"},
{"name": "Staff 3", "status": "Offline"},
{"name": "Vehicle 1", "status": "Available"},
{"name": "Vehicle 2", "status": "Unavailable"},
{"name": "Team 1", "status": "Active"},
{"name": "Team 2", "status": "Not Active"},
];
@override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: [
Expanded(
child: ListView.separated(
separatorBuilder: (BuildContext context, int index) => Divider(
color: Colors.black,
endIndent: 10,
indent: 10,
),
itemCount: users.length,
itemBuilder: (context, index) {
// parsing the maps in the list before passing them into the extracted widget
// the itemBuilder iterates through the list
final name = users[index]['name'];
final status = users[index]['status'];
return CustomListTile(name: name, status: status);
},
),
),
],
),
);
}
}