How to make a Listview Multiselection in a flutter. In this post, we are going to create a Listview with Multiselection process.
This example contains below widgets
ExpansionTile
CheckboxListTile
Check Simple Expandable Listview Example
Let's Check the code
Here List items handle with CheckboxListTile
CheckboxListTile(
title: new Text(item.title),
value: item.isAdded,
activeColor: Colors.pink,
checkColor: Colors.white,
onChanged: (bool value) {
setState(() {
item.isAdded = value;
if(!value)
{
Constants.removeAll(index, k);
}
});
},
)
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main.dart file
import 'dart:core';
import 'package:flutter/material.dart';
import 'cart.dart';
import 'constnts.dart';
import 'list_item.dart';
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.red,
),
home: MyHomePage(title: 'Multi Selection- ExpansionTile'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
void initState() {
super.initState();
Constants.allItems=new List();
for(var k=1;k<=5;k++)
{
Constants.allItems.add(Cart(getMenu(k), getSubMenu()));
}
Constants.allItems.map((s){
}).map((list)=>list).toList();
}
@override
Widget build(BuildContext context) {
List<String>list=List();
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Stack(
children: [
Opacity(opacity: .6,child: Image.network( "https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcRwp3QntHc1KiYvEt-zoR3_k5KndhiaXTZKfw&usqp=CAU",width: double.infinity,height:double.infinity,fit: BoxFit.cover,)),
Center(
child: ListView.builder(
itemCount: Constants.allItems.length,
itemBuilder: (context,index){
return ListItem(index);
},
)
)
],
),
);
}
String getMenu(int month)
{
switch(month)
{
case 1:
return "Biryanis";
case 2:
return "Cool Drinks";
case 3:
return "Tiffins";
case 4:
return "Fast Food";
case 5:
return "Roties";
}
}
List<SubItem> getSubMenu()
{
return [ SubItem("Item 1",false,0), SubItem("Item 2",false,0), SubItem("Item 3",false,0)].toList();
}
}
class SubItem{
var title;
var isAdded=false;
var count;
SubItem(String title, bool isAdded, int count){
this.title=title;
this.isAdded=isAdded;
this.count=count;
}
}
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list_item.dart
import 'package:flutter/material.dart';
import 'constnts.dart';
import 'multiselect_expansionlist.dart';
class ListItem extends StatefulWidget{
int index;
ListItem(this.index);
@override
State<StatefulWidget>createState()
{
return ListItemState();
}
}
class ListItemState extends State<ListItem>
{
bool isExpand=false;
@override
void initState() {
// TODO: implement initState
super.initState();
isExpand=false;
}
@override
Widget build(BuildContext context) {
List<SubItem>listItem=Constants.allItems[this.widget.index].subMenu;
return Padding(
padding: (isExpand==true)?const EdgeInsets.all(8.0):const EdgeInsets.all(12.0),
child: Container(
decoration:BoxDecoration(
color: Colors.white,
borderRadius: (isExpand!=true)?BorderRadius.all(Radius.circular(8)):BorderRadius.all(Radius.circular(22)),
border: Border.all(color: Colors.black)
),
child: ExpansionTile(
key: PageStorageKey<String>(Constants.allItems[this.widget.index].menuName),
title: Container(
width: double.infinity,
child: Text(Constants.allItems[this.widget.index].menuName,style: TextStyle(color:Colors.black,fontSize: (isExpand!=true)?18:22),)),
trailing: (isExpand==true)?Icon(Icons.arrow_drop_down,size: 32,color: Colors.pink,):Icon(Icons.arrow_drop_up,size: 32,color: Colors.pink),
onExpansionChanged: (value){
setState(() {
isExpand=value;
});
},
children: getItems(listItem,this.widget.index),
),
),
);
}
getItems(List listItems,index)
{
List<Widget> listWidget=new List();
for(int k=0;k<listItems.length;k++)
{
SubItem item=listItems[k];
listWidget.add( Padding(
padding: const EdgeInsets.all(8.0),
child:Container(
decoration:BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(Radius.circular(8)),
border: Border.all(color: Colors.blueGrey)
),
child: Column(
children: [
CheckboxListTile(
title: new Text(item.title),
value: item.isAdded,
activeColor: Colors.pink,
checkColor: Colors.white,
onChanged: (bool value) {
setState(() {
item.isAdded = value;
if(!value)
{
Constants.removeAll(index, k);
}
});
},
),
Row(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment:MainAxisAlignment.end,
children: [
InkWell(
onTap: (){
setState(() {
Constants.addCartItem(index, k);
});
},
child: Icon(Icons.add, color: Colors.green,size: 32,)),
Container(
margin: EdgeInsets.all(10),
child: Text(
"${item.count}",
style: TextStyle(fontSize: 18.0, color: Colors.black),
),
),
InkWell(
onTap:(){
setState(() {
Constants.removeCartItem(index, k);
});
},
child: Icon(Icons.remove, color: Colors.red,size: 32,)),
],),
],
),
)
));
}
return listWidget;
}
}
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cart.dart
class Cart{
String menuName;
List<SubItem>subMenu;
Cart(String menu, List<SubItem> subMenu){
this.menuName=menu;
this.subMenu=subMenu;
}
}
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class Constants
{
static List<Cart> allItems=new List();
static addCartItem(index,childIndex)
{
allItems[index].subMenu[childIndex].count++;
}
static removeCartItem(index,childIndex) {
if(allItems[index].subMenu[childIndex].count>1)
allItems[index].subMenu[childIndex].count--;
}
static void removeAll(index, int childIndex) {
allItems[index].subMenu[childIndex].count=0;
}
}
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