Flutter ListView Search


 


contactslist.dart
================


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class ContactsList extends StatefulWidget {
  static String tag = 'contactlist-page';

  @override  State<StatefulWidget> createState() {
       return new _ContactsListState();
  }
}

List<Contact> contacts = [
  Contact(fullName: 'Pratap Kumar', email: 'pratap@example.com'),
  Contact(fullName: 'Jagadeesh', email: 'Jagadeesh@example.com'),
  Contact(fullName: 'Srinivas', email: 'Srinivas@example.com'),
  Contact(fullName: 'Narendra', email: 'Narendra@example.com'),
  Contact(fullName: 'Sravan ', email: 'Sravan@example.com'),
  Contact(fullName: 'Ranganadh', email: 'Ranganadh@example.com'),
  Contact(fullName: 'Karthik', email: 'Karthik@example.com'),
  Contact(fullName: 'Saranya', email: 'Saranya@example.com'),
  Contact(fullName: 'Mahesh', email: 'Mahesh@example.com'),
];
class _ContactsListState extends State<ContactsList> {
  TextEditingController searchController = new TextEditingController();
  String filter;

  @override  initState() {
    searchController.addListener(() {
      setState(() {
        filter = searchController.text;
      });
    });
  }

  @override  void dispose() {
    searchController.dispose();
    super.dispose();
  }

  @override  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
            title: Text('Contacts',
                style: TextStyle(
                    color: Colors.white, fontWeight: FontWeight.bold))),
        body: new Column(
          children: <Widget>[
            new Padding(
              padding: new EdgeInsets.all(8.0),
              child: new TextField(
                controller: searchController,
                decoration: InputDecoration(
                  hintText: 'Search Contacts',
                  contentPadding: EdgeInsets.fromLTRB(20.0, 15.0, 20.0, 15.0),
                  border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(32.0)),
                ),
              ),
            ),
            new Expanded(
              child: new ListView.builder(
                itemCount: contacts.length,
                itemBuilder: (context, index) {
                  // if filter is null or empty returns all data                  return filter == null || filter == ""                      ? ListTile(
                          title: Text(
                            '${contacts[index].fullName}',
                          ),
                          subtitle: Text('${contacts[index].email}'),
                          leading: new CircleAvatar(
                              backgroundColor: Colors.blue,
                              child: Text(
                                  '${contacts[index].fullName.substring(0, 1)}')),
                          onTap: () => _onTapItem(context, contacts[index]),
                        )
                      : '${contacts[index].fullName}'                              .toLowerCase()
                              .contains(filter.toLowerCase())
                          ? ListTile(
                              title: Text(
                                '${contacts[index].fullName}',
                              ),
                              subtitle: Text('${contacts[index].email}'),
                              leading: new CircleAvatar(
                                  backgroundColor: Colors.blue,
                                  child: Text(
                                      '${contacts[index].fullName.substring(0, 1)}')),
                              onTap: () =>
                                  _onTapItem(context, contacts[index]),
                            )
                          : new Container();
                },
              ),
            ),
          ],
        ));
  }

  void _onTapItem(BuildContext context, Contact post) {
    Scaffold.of(context).showSnackBar(
        new SnackBar(content: new Text("Tap on " + ' - ' + post.fullName)));
  }
}


class Contact {
  final String fullName;
  final String email;

  const Contact({this.fullName, this.email});
}








main.dart
===========


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import 'package:flutter/material.dart';
import 'package:users/contactslist.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  

  @override  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Contacts',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.lightBlue,
       
      ),
      home: ContactsList(),
     
    );
  }
}

Resource : Flutter listview search



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