按下按钮时颤动显示Listview [英] Flutter display Listview when button pressed
问题描述
List<ServicesMensCollection> menServicesList = []
..add(ServicesMensCollection('ihdgfstfyergjergdshf', 'janik', 10))
..add(ServicesMensCollection('ihdgfstfyergjerg', 'janik', 10))
..add(ServicesMensCollection('ihdgfstfyergjerg', 'janik', 10))
..add(ServicesMensCollection('ihdgfstfyergjergdf', 'janik', 10))
bool _value2 = false;
void _value2Changed(bool value) => setState(() => _value2 = value);
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: new Scaffold(
body: new Container(
decoration: new BoxDecoration(color: const Color(0xFFEAEAEA)),
child: Padding(
padding: EdgeInsets.fromLTRB(10.0, 10.0, 10.0, 10.0),
child: Column(
children: <Widget>[
servicesCategory(),
],),),)); }
Widget servicesButton() {
return Container(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
RaisedButton(
onPressed: () {listView();},
child: Text('Mens'),),
RaisedButton(
onPressed: () {listView();},
child: Text('Womens')),
RaisedButton(
onPressed: () {listView();},
child: Text('Childrens'),
)]); }
Widget listView(){
return ListView.builder(
itemCount: menServicesList.length,
itemBuilder: (BuildContext context, int index) {
return list(index); },);
}
Widget list(int index){
return Container(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Text(menServicesList[index].name),
Text(menServicesList[index].name),
Checkbox(onChanged:_value2Changed,
value: _value2,
)],),);
}}
我正在项目中使用复选框实现listview.我有3个连续创建的按钮.我想在单击按钮时显示列表.这里的问题是listview对我完全不可见.已经在android中实现了相同的示例,但是我不知道如何在Flutter中做到这一点.
I am implementing listview with checkbox in my project.I have 3 buttons which is created in a row.I want to display the list when the button is clicked.Here the issue is listview is not at all visible for me.I had implemented the same example in android but i don't know how to do this in flutter.
推荐答案
尝试一下.这是一个示例屏幕,您可以参考其实现. 在此列表中,有3个示例列表被替换为主列表,您可以添加一个函数,该函数将根据选择对列表进行排序(因此无需多个列表)
Try this. This is a sample screen which you can refer for your implementation. In this there are 3 sample list which are being replaced to main list on selection, you can add a function which will sort the list based on selection (so no need to have multiple lists)
import 'package:flutter/material.dart';
/*
These are the sample list for demo
*/
List<ItemVO> mainList = List();
List<ItemVO> sampleMenList = [
ItemVO("1", "Mens 1"),
ItemVO("2", "Mens 2"),
ItemVO("3", "Mens 3")
];
List<ItemVO> sampleWomenList = [
ItemVO("1", "Women 1"),
ItemVO("2", "Women 2"),
ItemVO("3", "Women 3")
];
List<ItemVO> sampleKidsList = [
ItemVO("1", "kids 1"),
ItemVO("2", "kids 2"),
ItemVO("3", "kids 3")
];
class TestScreen extends StatefulWidget {
@override
State<StatefulWidget> createState() {
return _TestScreen();
}
}
class _TestScreen extends State<TestScreen> {
@override
void initState() {
super.initState();
mainList.addAll(sampleMenList);
}
@override
Widget build(BuildContext context) {
return Material(
child: Stack(
children: <Widget>[
ListView.builder(
itemBuilder: (BuildContext context, index) {
return getCard(index);
},
itemCount: mainList.length,
),
Container(
margin: EdgeInsets.only(bottom: 20),
alignment: Alignment.bottomCenter,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
FloatingActionButton(
onPressed: () {
mainList.clear();
setState(() {
mainList.addAll(sampleMenList);
});
},
heroTag: "btn1",
child: Text("Mens"),
),
FloatingActionButton(
onPressed: () {
mainList.clear();
setState(() {
mainList.addAll(sampleWomenList);
});
},
heroTag: "btn2",
child: Text("Women"),
),
FloatingActionButton(
onPressed: () {
mainList.clear();
setState(() {
mainList.addAll(sampleKidsList);
});
},
heroTag: "btn3",
child: Text("Kids"),
)
],
),
),
],
),
);
}
/*
Get the card item for a list
*/
getCard(int position) {
ItemVO model = mainList[position];
return Card(
child: Container(
height: 50,
alignment: Alignment.center,
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
"ID:: "+model._id,
style: TextStyle(fontSize: 18, color: Colors.black),
),
Padding(padding: EdgeInsets.only(left: 5,right: 5)),
Text(
"Name:: "+model._name,
style: TextStyle(fontSize: 18, color: Colors.black),
)
],
),
),
margin: EdgeInsets.all(10),
);
}
}
/*
Custom model
i.e. for itemList
*/
class ItemVO {
String _id, _name;
String get id => _id;
set id(String value) {
_id = value;
}
get name => _name;
set name(value) {
_name = value;
}
ItemVO(this._id, this._name);
}
在您的代码中,您没有在窗口小部件中添加ListView,因此它不会显示任何列表,因此请尝试在窗口小部件中添加ListView,然后更改列表数据并尝试.
In your code you didn't added ListView in widget, so it will not show any list, so try adding ListView in widget and then change the list data and try it.
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