GroupListView In Flutter :
This flutter tutorial post is GroupListView In Flutter. GroupListView is use select programming language, history, select team etc. That program is group by name, date wise.
if (sort && elements.isNotEmpty) if (groupBy(elements[0]) is Comparable) { elements.sort((e1, e2) =>< (groupBy(e1) as Comparable).compareTo(groupBy(e2) as Comparable)); } else { elements .sort((e1, e2) => ('${groupBy(e1)}').compareTo('${groupBy(e2)}')); } }
Screenshot :

main.dart
import 'package:flutter/material.dart'; import 'grouped_list.dart'; void main() => runApp(MyApp()); List _elements = [ {'name': 'Basic Java', 'group': 'Java'}, {'name': 'PHP', 'group': 'Java'}, {'name': 'BLoC Pattern', 'group': 'Flutter'}, {'name': 'Lifecycle Android', 'group': 'Android'}, {'name': 'Basic Flutter', 'group': 'Flutter'}, {'name': 'Inheritance', 'group': 'Java'}, ]; class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( debugShowCheckedModeBanner: false, title: 'Flutter Tutorial', theme: ThemeData( primarySwatch: Colors.blue, ), home: Scaffold( appBar: AppBar( title: Text('Grouped List View In Flutter'), ), body: GroupedListView<dynamic, String>( groupBy: (element) => element['group'], elements: _elements, sort: true, groupSeparatorBuilder: (String value) => Padding( padding: const EdgeInsets.all(8.0), child: Center( child: Text( value, style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold), )), ), itemBuilder: (c, element) { return Card( elevation: 0.5, 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(Icons.account_circle), title: Text(element['name']), trailing: Icon(Icons.arrow_forward), ), ), ); }, ), ), ); } }
grouped_list.dart
library grouped_list; import 'package:flutter/material.dart'; class GroupedListView<T, E> extends ListView { GroupedListView({ @required E Function(T element) groupBy, @required Widget Function(E value) groupSeparatorBuilder, @required Widget Function(BuildContext context, T element) itemBuilder, bool sort = true, Widget separator = const Divider(height: 0.0), List<T> elements, Key key, Axis scrollDirection = Axis.vertical, ScrollController controller, bool primary, ScrollPhysics physics, bool shrinkWrap = false, EdgeInsetsGeometry padding, bool addAutomaticKeepAlives = true, bool addRepaintBoundaries = true, bool addSemanticIndexes = true, double cacheExtent, }) : super.builder( key: key, scrollDirection: scrollDirection, controller: controller, primary: primary, physics: physics, shrinkWrap: shrinkWrap, padding: padding, itemCount: elements.length * 2, addAutomaticKeepAlives: addAutomaticKeepAlives, addRepaintBoundaries: addRepaintBoundaries, addSemanticIndexes: addSemanticIndexes, cacheExtent: cacheExtent, itemBuilder: (context, index) { int actualIndex = index ~/ 2; if (index.isEven) { E curr = groupBy(elements[actualIndex]); E prev = actualIndex - 1 < 0 ? null : groupBy(elements[actualIndex - 1]); if (prev != curr) { return groupSeparatorBuilder(curr); } return separator; } return itemBuilder(context, elements[actualIndex]); }, ) { if (sort && elements.isNotEmpty) { if (groupBy(elements[0]) is Comparable) { elements.sort((e1, e2) => (groupBy(e1) as Comparable).compareTo(groupBy(e2) as Comparable)); } else { elements .sort((e1, e2) => ('${groupBy(e1)}').compareTo('${groupBy(e2)}')); } } } }
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