Flutter Sectioned ListView Examples

Sectioned ListView Widget in Flutter

Sectioned ListView widget is a useful and powerful widget in Flutter that allows developers to display a list of items grouped by a specific category or section. It is a great way to organize and present data in a more efficient and user-friendly way. In this article, we will walk through the steps required to implement a Sectioned ListView widget in Flutter.

Getting Started

Before we begin, make sure you have Flutter installed on your machine. If you don't have it installed, you can download it from the official Flutter website. Once you have Flutter installed, you can create a new Flutter project in your preferred IDE.

Adding Dependencies

To use the Sectioned ListView widget, we need to add the flutter_section_list dependency to our pubspec.yaml file. To do that, open your pubspec.yaml file and add the following code:

dependencies:
  flutter:
    sdk: flutter
  flutter_section_list: ^0.1.1

After adding the dependency, run flutter pub get to download and install the required packages.

Creating the Data Model

We need to create a data model that represents the data we want to display in our Sectioned ListView widget. In this example, we will create a simple data model that represents a list of fruits grouped by their category.

class Fruit {
  final String name;
  final String category;
  
  Fruit({required this.name, required this.category});
}

List<Fruit> fruits = [
  Fruit(name: 'Apple', category: 'Fruits'),
  Fruit(name: 'Banana', category: 'Fruits'),
  Fruit(name: 'Orange', category: 'Fruits'),
  Fruit(name: 'Tomato', category: 'Vegetables'),
  Fruit(name: 'Carrot', category: 'Vegetables'),
  Fruit(name: 'Spinach', category: 'Vegetables'),
];

Creating the Sectioned ListView Widget

Now that we have our data model, we can create the Sectioned ListView widget. In this example, we will create a simple Sectioned ListView widget that displays the list of fruits grouped by their category.

import 'package:flutter/material.dart';
import 'package:flutter_section_list/flutter_section_list.dart';

class SectionedListView extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Sectioned ListView'),
      ),
      body: FlutterSectionList(
        sectionCount: 2,
        itemCountOfSection: (section) {
          if (section == 0) {
            return fruits.where((fruit) => fruit.category == 'Fruits').length;
          } else {
            return fruits.where((fruit) => fruit.category == 'Vegetables').length;
          }
        },
        headerInSection: (section) {
          if (section == 0) {
            return Text('Fruits');
          } else {
            return Text('Vegetables');
          }
        },
        itemBuilder: (section, index) {
          if (section == 0) {
            var fruit = fruits.where((fruit) => fruit.category == 'Fruits').toList()[index];
            return ListTile(
              title: Text(fruit.name),
              subtitle: Text(fruit.category),
            );
          } else {
            var fruit = fruits.where((fruit) => fruit.category == 'Vegetables').toList()[index];
            return ListTile(
              title: Text(fruit.name),
              subtitle: Text(fruit.category),
            );
          }
        },
      ),
    );
  }
}

In the code above, we created a SectionedListView widget that displays the list of fruits grouped by their category. We used the FlutterSectionList widget provided by the flutter_section_list package to create the Sectioned ListView widget.

We set the sectionCount property to 2, as we have two categories: Fruits and Vegetables. We used the itemCountOfSection property to define the number of items in each section. We also used the headerInSection property to display the header for each section.

Finally, we used the itemBuilder property to build the list items for each section. In the itemBuilder function, we filtered the list of fruits based on their category and returned a ListTile widget for each fruit.

More Examples

This section will look at examples showing how to section or group items in a listview. This type of widget is called a grouped or sectioned listview.

If you want to learn the normal ListView then check here

Example 1: Flutter Grouped List Example using grouped_list

grouped_list is a Flutter ListView in which items can be grouped into sections.

Here are the features of grouped_list package:

• Sound null safety support!
• Easy creation of chat dialog.
• List Items can be separated in groups.
• For the groups an individual header can be set.
• Almost all fields from ListView.builder available.

Check the screenshots for example we will create:

Step 1: Create Project

Start by creating an empty flutter project.

Step 2: Add Dependency

Next add grouped_list as a dependency in your pubspec.yaml:

 grouped_list: ^4.1.0

Then sync or flutter pub get to install it.

Step 3: Create GroupedListView

First import the grouped_list package:

import 'package:grouped_list/grouped_list.dart';

Then replace your ListView with the GroupedListView, and utilize additional options as shown below:

 GroupedListView<dynamic, String>(
   elements: _elements,
   groupBy: (element) => element['group'],
   groupSeparatorBuilder: (String groupByValue) => Text(groupByValue),
   itemBuilder: (context, dynamic element) => Text(element['name']),
   itemComparator: (item1, item2) => item1['name'].compareTo(item2['name']), // optional
   useStickyGroupSeparators: true, // optional
   floatingHeader: true, // optional
   order: GroupedListOrder.ASC, // optional
 ),

Full Example

Let us look at a full example of how to create a Grouped or Sectioned ListView using this library.

Step 1: Create Project

Cretae project as has been discussed.

Step 2: Install Library

Install the library as has been discussed.

pubspec.yaml

dependencies:
  flutter:
    sdk: flutter
  grouped_list:
    path: ../
  intl: ^0.17.0

Step 4: Create Chat ListView

Use the following code to create a chatview using this sectioned listview:

chat_example.dart

import 'package:flutter/material.dart';
import 'package:grouped_list/grouped_list.dart';
import 'package:intl/intl.dart';
void main() => runApp(MyApp());
List<Element> _elements = [
  Element(DateTime(2020, 6, 24, 9, 25), 'Hello how are you?'),
  Element(DateTime(2020, 6, 24, 9, 36), 'Fine and what about you?', true),
  Element(DateTime(2020, 6, 24, 9, 39), 'I am fine too'),
  Element(DateTime(2020, 6, 25, 14, 12),
      'Hey you do you wanna go to the cinema?', true),
  Element(
      DateTime(2020, 6, 25, 14, 19), 'Yes of course when do we want to meet'),
  Element(DateTime(2020, 6, 25, 14, 20), 'Lets meet at 8 o clock', true),
  Element(DateTime(2020, 6, 25, 14, 25), 'Okay see you then :)'),
  Element(DateTime(2020, 6, 27, 18, 41),
      'Hey whats up? Can you help me real quick?'),
  Element(DateTime(2020, 6, 27, 18, 45), 'Of course  what do you need?', true),
  Element(DateTime(2020, 6, 28, 8, 47),
      'Can you send me the homework for tomorrow please?'),
  Element(
    DateTime(2020, 6, 28, 8, 48),
    'I dont understand the math questions :(',
  ),
  Element(DateTime(2020, 6, 28, 8, 56), 'Yeah sure I have send them per mail',
      true),
];
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Grouped List Chat Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text('Grouped List View Example'),
        ),
        body: Builder(
          builder: (context) => Column(
            children: [
              Container(
                height: MediaQuery.of(context).size.height * 0.8,
                child: GroupedListView<Element, DateTime>(
                  elements: _elements,
                  order: GroupedListOrder.DESC,
                  reverse: true,
                  floatingHeader: true,
                  useStickyGroupSeparators: true,
                  groupBy: (Element element) => DateTime(
                      element.date.year, element.date.month, element.date.day),
                  groupHeaderBuilder: (Element element) => Container(
                    height: 40,
                    child: Align(
                      child: Container(
                        width: 120,
                        decoration: BoxDecoration(
                          color: Colors.blue,
                          borderRadius:
                              const BorderRadius.all(Radius.circular(10.0)),
                        ),
                        child: Padding(
                          padding: const EdgeInsets.all(8.0),
                          child: Text(
                            '${DateFormat.yMMMd().format(element.date)}',
                            textAlign: TextAlign.center,
                          ),
                        ),
                      ),
                    ),
                  ),
                  itemBuilder: (_, Element element) {
                    return Align(
                      alignment: element.sender
                          ? Alignment.centerRight
                          : Alignment.centerLeft,
                      child: Container(
                        width: MediaQuery.of(context).size.width * 0.9,
                        child: Card(
                          shape: RoundedRectangleBorder(
                            borderRadius: BorderRadius.circular(6.0),
                          ),
                          elevation: 8.0,
                          margin: const EdgeInsets.symmetric(
                              horizontal: 10.0, vertical: 6.0),
                          child: ListTile(
                            contentPadding: const EdgeInsets.symmetric(
                                horizontal: 20.0, vertical: 10.0),
                            leading: element.sender
                                ? Text(DateFormat.Hm().format(element.date))
                                : const Icon(Icons.person),
                            title: Text(element.name),
                            trailing: element.sender
                                ? const Icon(Icons.person_outline)
                                : Text(DateFormat.Hm().format(element.date)),
                          ),
                        ),
                      ),
                    );
                  },
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}
class Element implements Comparable {
  DateTime date;
  String name;
  bool sender = false;
  Element(this.date, this.name, [this.sender = false]);
  @override
  int compareTo(other) {
    return date.compareTo(other.date);
  }
}

More code

example_sliver.dart

import 'package:flutter/material.dart';
import 'package:grouped_list/sliver_grouped_list.dart';
void main() => runApp(MyApp());
List _elements = [
  {'name': 'John', 'group': 'Team A'},
  {'name': 'Will', 'group': 'Team B'},
  {'name': 'Beth', 'group': 'Team A'},
  {'name': 'Miranda', 'group': 'Team B'},
  {'name': 'Mike', 'group': 'Team C'},
  {'name': 'Danny', 'group': 'Team C'},
];
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text('Grouped List View Example'),
        ),
        body: CustomScrollView(
          slivers: [
            SliverGroupedListView<dynamic, String>(
              elements: _elements,
              groupBy: (element) => element['group'],
              groupComparator: (value1, value2) => value2.compareTo(value1),
              itemComparator: (item1, item2) =>
                  item1['name'].compareTo(item2['name']),
              order: GroupedListOrder.DESC,
              groupSeparatorBuilder: (String value) => Padding(
                padding: const EdgeInsets.all(8.0),
                child: Text(
                  value,
                  textAlign: TextAlign.center,
                  style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
                ),
              ),
              itemBuilder: (c, element) {
                return Card(
                  elevation: 8.0,
                  margin: EdgeInsets.symmetric(horizontal: 10.0, vertical: 6.0),
                  child: Container(
                    child: ListTile(
                      contentPadding: EdgeInsets.symmetric(
                          horizontal: 20.0, vertical: 10.0),
                      leading: Icon(Icons.account_circle),
                      title: Text(element['name']),
                      trailing: Icon(Icons.arrow_forward),
                    ),
                  ),
                );
              },
            ),
          ],
        ),
      ),
    );
  }
}

example.dart

import 'package:flutter/material.dart';
import 'package:grouped_list/grouped_list.dart';
void main() => runApp(MyApp());
List _elements = [
  {'name': 'John', 'group': 'Team A'},
  {'name': 'Will', 'group': 'Team B'},
  {'name': 'Beth', 'group': 'Team A'},
  {'name': 'Miranda', 'group': 'Team B'},
  {'name': 'Mike', 'group': 'Team C'},
  {'name': 'Danny', 'group': 'Team C'},
];
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text('Grouped List View Example'),
        ),
        body: GroupedListView<dynamic, String>(
          elements: _elements,
          groupBy: (element) => element['group'],
          groupComparator: (value1, value2) => value2.compareTo(value1),
          itemComparator: (item1, item2) =>
              item1['name'].compareTo(item2['name']),
          order: GroupedListOrder.DESC,
          useStickyGroupSeparators: true,
          groupSeparatorBuilder: (String value) => Padding(
            padding: const EdgeInsets.all(8.0),
            child: Text(
              value,
              textAlign: TextAlign.center,
              style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
            ),
          ),
          itemBuilder: (c, element) {
            return Card(
              elevation: 8.0,
              margin: EdgeInsets.symmetric(horizontal: 10.0, vertical: 6.0),
              child: Container(
                child: ListTile(
                  contentPadding:
                      EdgeInsets.symmetric(horizontal: 20.0, vertical: 10.0),
                  leading: Icon(Icons.account_circle),
                  title: Text(element['name']),
                  trailing: Icon(Icons.arrow_forward),
                ),
              ),
            );
          },
        ),
      ),
    );
  }
}

Run

Copy the code or download it in the link below, build and run.

Reference

Here are the reference links:

Number	Link
1.	Download Example
2.	Follow code author

Example 2: Sticky Grouped List Example

This is a grouped listview with sticky headers. It uses the sticky_grouped_list library.

sticky_grouped_list is a ListView with sticky headers in which list items can be grouped to sections.

Here are it's features:

• Easy creation of chat-like interfaces.
• List items can be separated in groups.
• For the groups an individual header can be set.
• Sticky headers with floating option.
• All fields from ScrollablePositionedList available.

Here is the screenshot of the created project:

Step 1: Create Project

Start by creating an empty flutter project.

Step 2: Install it

Install the Sticky grouped list by depending on it in the pubspec.yaml as follows:

    sticky_grouped_list: ^2.0.0-nullsafety.2

flutter pub get or sync to fetch it.

Step 3: Create Sticky Grouped ListView

Start by importing the package:

import 'package:sticky_grouped_list/sticky_grouped_list.dart';

Then create a StickyGroupedListView as follows:

 StickyGroupedListView<dynamic, String>(
   elements: _elements,
   groupBy: (dynamic element) => element['group'],
   groupSeparatorBuilder: (dynamic element) => Text(element['group']),
   itemBuilder: (context, dynamic element) => Text(element['name']),
   itemComparator: (element1, element2) => element1['name'].compareTo(element2['name']), // optional
   itemScrollController: GroupedItemScrollController(), // optional
   order: StickyGroupedListOrder.ASC, // optional
 ),

Full Example

Step 1: Create Project

Create flutter project as has been discussed.

Step 2: Install Library

Install the library as has been discussed.

dependencies:
  flutter:
    sdk: flutter
  sticky_grouped_list:
    path: ../
  intl: ^0.17.0

Step 5: Write Code

(a).Chat Screen Example

For Example to create a chat screen use the following code:

chatExample.dart

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:sticky_grouped_list/sticky_grouped_list.dart';
void main() => runApp(MyApp());
List<Element> _elements = <Element>[
  Element(DateTime(2020, 6, 24, 9, 25), 'Hello how are you?'),
  Element(DateTime(2020, 6, 24, 9, 36), 'Fine and what about you?', true),
  Element(DateTime(2020, 6, 24, 9, 39), 'I am fine too'),
  Element(DateTime(2020, 6, 25, 14, 12),
      'Hey you do you wanna go to the cinema?', true),
  Element(
      DateTime(2020, 6, 25, 14, 19), 'Yes of course when do we want to meet'),
  Element(DateTime(2020, 6, 25, 14, 20), 'Lets meet at 8 o clock', true),
  Element(DateTime(2020, 6, 25, 14, 25), 'Okay see you then :)'),
  Element(DateTime(2020, 6, 27, 18, 41),
      'Hey whats up? Can you help me real quick?'),
  Element(DateTime(2020, 6, 27, 18, 45), 'Of course  what do you need?', true),
  Element(DateTime(2020, 6, 27, 18, 47),
      'Can you send me the homework for tomorrow please?'),
  Element(
    DateTime(2020, 6, 27, 18, 48),
    'I dont understand the math questions :(',
  ),
  Element(DateTime(2020, 6, 27, 18, 56), 'Yeah sure I have send them per mail',
      true),
];
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text('Chat with Peter'),
        ),
        body: Column(
          children: [
            Container(
              height: 700,
              child: StickyGroupedListView<Element, DateTime>(
                elements: _elements,
                order: StickyGroupedListOrder.DESC,
                reverse: true,
                groupBy: (Element element) => DateTime(
                    element.date.year, element.date.month, element.date.day),
                floatingHeader: true,
                groupSeparatorBuilder: (Element element) => Container(
                  height: 50,
                  child: Align(
                    alignment: Alignment.center,
                    child: Container(
                      width: 120,
                      decoration: BoxDecoration(
                        color: Colors.blue[300],
                        border: Border.all(
                          color: Colors.blue[300]!,
                        ),
                        borderRadius: BorderRadius.all(Radius.circular(20.0)),
                      ),
                      child: Padding(
                        padding: const EdgeInsets.all(8.0),
                        child: Text(
                          '${DateFormat.yMMMd().format(element.date)}',
                          textAlign: TextAlign.center,
                        ),
                      ),
                    ),
                  ),
                ),
                itemBuilder: (_, Element element) {
                  return Align(
                    alignment: element.swapped
                        ? Alignment.centerRight
                        : Alignment.centerLeft,
                    child: Container(
                      width: 370,
                      child: Card(
                        shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(6.0),
                        ),
                        elevation: 8.0,
                        margin: new EdgeInsets.symmetric(
                            horizontal: 10.0, vertical: 6.0),
                        child: Container(
                          child: ListTile(
                            contentPadding: EdgeInsets.symmetric(
                                horizontal: 20.0, vertical: 10.0),
                            leading: element.swapped
                                ? Text(DateFormat.Hm().format(element.date))
                                : Icon(Icons.person),
                            title: Text(element.name),
                            trailing: element.swapped
                                ? Icon(Icons.person_outline)
                                : Text(DateFormat.Hm().format(element.date)),
                          ),
                        ),
                      ),
                    ),
                  );
                },
              ),
            ),
            TextField(
              decoration: InputDecoration(
                  border: InputBorder.none,
                  hintText: 'Enter a new message here'),
            ),
          ],
        ),
      ),
    );
  }
}
class Element implements Comparable {
  DateTime date;
  String name;
  bool swapped = false;
  Element(this.date, this.name, [this.swapped = false]);
  @override
  int compareTo(other) {
    return date.compareTo(other.date);
  }
}

(b). Sticky Grouped ListView Example

example.dart

import 'package:flutter/material.dart';
import 'package:sticky_grouped_list/sticky_grouped_list.dart';
void main() => runApp(MyApp());
List<Element> _elements = <Element>[
  Element(DateTime(2020, 6, 24, 18), 'Got to gym', Icons.fitness_center),
  Element(DateTime(2020, 6, 24, 9), 'Work', Icons.work),
  Element(DateTime(2020, 6, 25, 8), 'Buy groceries', Icons.shopping_basket),
  Element(DateTime(2020, 6, 25, 16), 'Cinema', Icons.movie),
  Element(DateTime(2020, 6, 25, 20), 'Eat', Icons.fastfood),
  Element(DateTime(2020, 6, 26, 12), 'Car wash', Icons.local_car_wash),
  Element(DateTime(2020, 6, 27, 12), 'Car wash', Icons.local_car_wash),
  Element(DateTime(2020, 6, 27, 13), 'Car wash', Icons.local_car_wash),
  Element(DateTime(2020, 6, 27, 14), 'Car wash', Icons.local_car_wash),
  Element(DateTime(2020, 6, 27, 15), 'Car wash', Icons.local_car_wash),
  Element(DateTime(2020, 6, 28, 12), 'Car wash', Icons.local_car_wash),
  Element(DateTime(2020, 6, 29, 12), 'Car wash', Icons.local_car_wash),
  Element(DateTime(2020, 6, 29, 12), 'Car wash', Icons.local_car_wash),
  Element(DateTime(2020, 6, 30, 12), 'Car wash', Icons.local_car_wash),
];
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text('Grouped List View Example'),
        ),
        body: StickyGroupedListView<Element, DateTime>(
          elements: _elements,
          order: StickyGroupedListOrder.ASC,
          groupBy: (Element element) =>
              DateTime(element.date.year, element.date.month, element.date.day),
          groupComparator: (DateTime value1, DateTime value2) =>
              value2.compareTo(value1),
          itemComparator: (Element element1, Element element2) =>
              element1.date.compareTo(element2.date),
          floatingHeader: true,
          groupSeparatorBuilder: (Element element) => Container(
            height: 50,
            child: Align(
              alignment: Alignment.center,
              child: Container(
                width: 120,
                decoration: BoxDecoration(
                  color: Colors.blue[300],
                  border: Border.all(
                    color: Colors.blue[300]!,
                  ),
                  borderRadius: BorderRadius.all(Radius.circular(20.0)),
                ),
                child: Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Text(
                    '${element.date.day}. ${element.date.month}, ${element.date.year}',
                    textAlign: TextAlign.center,
                  ),
                ),
              ),
            ),
          ),
          itemBuilder: (_, Element element) {
            return Card(
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(6.0),
              ),
              elevation: 8.0,
              margin: new EdgeInsets.symmetric(horizontal: 10.0, vertical: 6.0),
              child: Container(
                child: ListTile(
                  contentPadding:
                      EdgeInsets.symmetric(horizontal: 20.0, vertical: 10.0),
                  leading: Icon(element.icon),
                  title: Text(element.name),
                  trailing: Text('${element.date.hour}:00'),
                ),
              ),
            );
          },
        ),
      ),
    );
  }
}
class Element {
  DateTime date;
  String name;
  IconData icon;
  Element(this.date, this.name, this.icon);
}

Run

Copy the code or download it in the link below, build and run.

Reference

Here are the reference links:

Number	Link
1.	Download Example
2.	Follow code author

Example 3: Flutter GroupListView Example

This is another example of how to create a grouped or sectioned listview in flutter. This time round we use the flutter_group_list_view package.

flutter_group_list_view is a ListView that allows you to group list items and support headers like iOS UITableView section.

Here are it's features:

• List Items can be grouped.
• Support headers for each group.
• All fields from ListView.builder constructor available.

Here's the demo of the project that will be created:

Step 1: Create Project

Start by creating an empty flutter project.

Step 2: Install it

In your pubspec.yaml declare this library as a dependency:

  group_list_view: ^1.1.1

Step 3: Create Grouped ListView

Start by importing it:

import 'package:group_list_view/group_list_view.dart';

Now rather than the standard Flutter ListView, use the GroupedListView:

 Map<String, List> _elements = {
   'Team A': ['Klay Lewis', 'Ehsan Woodard', 'River Bains'],
   'Team B': ['Toyah Downs', 'Tyla Kane'],
 };
 GroupListView(
   sectionsCount: _elements.keys.toList().length,
   countOfItemInSection: (int section) {
     return _elements.values.toList()[section].length;
   },
   itemBuilder: (BuildContext context, IndexPath index) {
     return Text(
       _elements.values.toList()[index.section][index.index],
       style: TextStyle(color: Colors.white, fontSize: 18),
     );
   },
   groupHeaderBuilder: (BuildContext context, int section) {
     return Padding(
       padding: const EdgeInsets.symmetric(horizontal: 15, vertical: 8),
       child: Text(
         _elements.keys.toList()[section],
         style: TextStyle(fontSize: 18, fontWeight: FontWeight.w600),
       ),
     );
   },
   separatorBuilder: (context, index) => SizedBox(height: 10),
   sectionSeparatorBuilder: (context, section) => SizedBox(height: 10),
 );

Full Example

Here is a full example

Step 1: Create Project

Create as has been discussed.

Step 2: Install Library

Install the library as has been discussed.

Step 3: Write Code

app_colors.dart

Create a class to hold the colors that will be applied to the icons in the ListView:

import 'package:flutter/material.dart';
class AppColors {
  static const List<Color> avatarColors = [
    Color(0xffe57373),
    Color(0xfff06292),
    Color(0xffba68c8),
    Color(0xff9575cd),
    Color(0xff7986cb),
    Color(0xff64b5f6),
    Color(0xff4fc3f7),
    Color(0xff4dd0e1),
    Color(0xff4db6ac),
    Color(0xff81c784),
    Color(0xffaed581),
    Color(0xffff8a65),
    Color(0xffd4e157),
    Color(0xffffd54f),
    Color(0xffffb74d),
    Color(0xffa1887f),
    Color(0xff90a4ae)
  ];
}

main.dart

Render data on the GroupedListView

import 'package:flutter/material.dart';
import 'package:group_list_view/group_list_view.dart';
import 'package:group_listview_example/app_colors.dart';
void main() => runApp(MyApp());
Map<String, List> _elements = {
  'Team A': ['Klay Lewis', 'Ehsan Woodard', 'River Bains'],
  'Team B': ['Toyah Downs', 'Tyla Kane'],
  'Team C': ['Marcus Romero', 'Farrah Parkes', 'Fay Lawson', 'Asif Mckay'],
  'Team D': [
    'Casey Zuniga',
    'Ayisha Burn',
    'Josie Hayden',
    'Kenan Walls',
    'Mario Powers'
  ],
  'Team Q': ['Toyah Downs', 'Tyla Kane', 'Toyah Downs'],
};
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Group List View Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text('Group List View Demo'),
        ),
        body: GroupListView(
          sectionsCount: _elements.keys.toList().length,
          countOfItemInSection: (int section) {
            return _elements.values.toList()[section].length;
          },
          itemBuilder: _itemBuilder,
          groupHeaderBuilder: (BuildContext context, int section) {
            return Padding(
              padding: const EdgeInsets.symmetric(horizontal: 15, vertical: 8),
              child: Text(
                _elements.keys.toList()[section],
                style: TextStyle(fontSize: 18, fontWeight: FontWeight.w600),
              ),
            );
          },
          separatorBuilder: (context, index) => SizedBox(height: 10),
          sectionSeparatorBuilder: (context, section) => SizedBox(height: 10),
        ),
      ),
    );
  }
  Widget _itemBuilder(BuildContext context, IndexPath index) {
    String user = _elements.values.toList()[index.section][index.index];
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 8.0),
      child: Card(
        elevation: 8,
        child: ListTile(
          contentPadding:
              const EdgeInsets.symmetric(horizontal: 18, vertical: 10.0),
          leading: CircleAvatar(
            child: Text(
              _getInitials(user),
              style: TextStyle(color: Colors.white, fontSize: 18),
            ),
            backgroundColor: _getAvatarColor(user),
          ),
          title: Text(
            _elements.values.toList()[index.section][index.index],
            style: TextStyle(fontSize: 16, fontWeight: FontWeight.w400),
          ),
          trailing: Icon(Icons.arrow_forward_ios),
        ),
      ),
    );
  }
  String _getInitials(String user) {
    var buffer = StringBuffer();
    var split = user.split(" ");
    for (var s in split) buffer.write(s[0]);
    return buffer.toString().substring(0, split.length);
  }
  Color _getAvatarColor(String user) {
    return AppColors
        .avatarColors;
  }
}

Run

Copy the code or download it in the link below, build and run.

Reference

Here are the reference links:

Number	Link
1.	Download Example
2.	Follow code author

Conclusion

In this article, we have learned how to create a Sectioned ListView widget in Flutter. We have seen how to create a data model, add dependencies, and create the Sectioned ListView widget using the flutter_section_list package. We hope this article has been helpful in your Flutter development journey. Happy coding!