Listview过滤器搜索Flutter

Question

  var userDetails = {};
  var i;
  List returnTicketDetails = [] ;

  body: new Column(
        children: <Widget>[
          new Container(
            color: Theme.of(context).primaryColor,
            child: new Padding(
              padding: const EdgeInsets.all(8.0),
              child: new Card(
                child: new ListTile(
                  leading: new Icon(Icons.search),
                  title: new TextField(
                    controller: controller,
                    decoration: new InputDecoration(
                        hintText: 'Search', border: InputBorder.none),
                   // onChanged: onSearchTextChanged,
                  ),
                  trailing: new IconButton(icon: new Icon(Icons.cancel), onPressed: () {
                    controller.clear();
                   // onSearchTextChanged('');
                  },),
                ),
          new Expanded(
            child: userDetails.length != 0 || controller.text.isNotEmpty
                ? new ListView.builder(
               itemCount: userDetails.length,
              itemBuilder: (context, i) {
                return new Card(

                  child: new Column
                    (mainAxisSize: MainAxisSize.min, children:
                    <Widget>[
                    new Row(children: <Widget>[
                    new Container(
                    width: 80.0,
                    height: 80.0,
                    decoration: new BoxDecoration(
                    shape: BoxShape.circle,
                    image: new DecorationImage(
                    fit: BoxFit.fill,
                    image: new NetworkImage(
                    "https:..")
                )
                )),
                    new Text(userDetails[returnTicketDetails[i]["user_id"]]["first_name"]
                    ),),
                  ,),
                    new Text(userDetails[returnTicketDetails[i]["user_id"]]["last_name"]),
                );
                },
            )
                : new ListView.builder(
               itemCount: userDetails.length,
              itemBuilder: (context, i) {
                return new Card(
                  child: new ListTile(
                    //title: new Text(userDetails[returnTicketDetails[i]["user_id"]]["first_name"]),
                  ),
                  margin: const EdgeInsets.all(0.0),
                );
    );
      }
 _getTicketDetails() async {
     final response = await http.get(
         "https..", headers: {
       HttpHeaders.AUTHORIZATION: access_token
     });
      returnTicketDetails = json.decode(response.body);
     for ( i = 0; i < (returnTicketDetails?.length ?? 0); i++) {
       final ticketresponse = await http.get(
           "https...", headers: {
         HttpHeaders.AUTHORIZATION:
         access_token
       });
       userDetails[returnTicketDetails[i]["user_id"]] =
           json.decode(ticketresponse.body);
   }
   }

我有几乎所有的东西都以我想要的方式,但我想知道如何使搜索功能根据我的ListView的索引工作？因此,例如,如果我根据我的情况输入"z",我不应该在列表中显示任何内容.我还在这里更新并发布了函数_getTicketDeatils.先感谢您!

Answer 1

我已经根据需要用url中的数据替换了硬编码模型输入.

import 'dart:async';

import 'package:flutter/material.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;

void main() => runApp(new MaterialApp(
  home: new HomePage(),
  debugShowCheckedModeBanner: false,
));

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => new _HomePageState();
}

class _HomePageState extends State<HomePage> {
  TextEditingController controller = new TextEditingController();

  // Get json result and convert it to model. Then add
  Future<Null> getUserDetails() async {
    final response = await http.get(url);
    final responseJson = json.decode(response.body);

    setState(() {
      for (Map user in responseJson) {
        _userDetails.add(UserDetails.fromJson(user));
      }
    });
  }

  @override
  void initState() {
    super.initState();

    getUserDetails();
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Home'),
        elevation: 0.0,
      ),
      body: new Column(
        children: <Widget>[
          new Container(
            color: Theme.of(context).primaryColor,
            child: new Padding(
              padding: const EdgeInsets.all(8.0),
              child: new Card(
                child: new ListTile(
                  leading: new Icon(Icons.search),
                  title: new TextField(
                    controller: controller,
                    decoration: new InputDecoration(
                        hintText: 'Search', border: InputBorder.none),
                    onChanged: onSearchTextChanged,
                  ),
                  trailing: new IconButton(icon: new Icon(Icons.cancel), onPressed: () {
                    controller.clear();
                    onSearchTextChanged('');
                  },),
                ),
              ),
            ),
          ),
          new Expanded(
            child: _searchResult.length != 0 || controller.text.isNotEmpty
                ? new ListView.builder(
              itemCount: _searchResult.length,
              itemBuilder: (context, i) {
                return new Card(
                  child: new ListTile(
                    leading: new CircleAvatar(backgroundImage: new NetworkImage(_searchResult[i].profileUrl,),),
                    title: new Text(_searchResult[i].firstName + ' ' + _searchResult[i].lastName),
                  ),
                  margin: const EdgeInsets.all(0.0),
                );
              },
            )
                : new ListView.builder(
              itemCount: _userDetails.length,
              itemBuilder: (context, index) {
                return new Card(
                  child: new ListTile(
                    leading: new CircleAvatar(backgroundImage: new NetworkImage(_userDetails[index].profileUrl,),),
                    title: new Text(_userDetails[index].firstName + ' ' + _userDetails[index].lastName),
                  ),
                  margin: const EdgeInsets.all(0.0),
                );
              },
            ),
          ),
        ],
      ),
    );
  }

  onSearchTextChanged(String text) async {
    _searchResult.clear();
    if (text.isEmpty) {
      setState(() {});
      return;
    }

    _userDetails.forEach((userDetail) {
      if (userDetail.firstName.contains(text) || userDetail.lastName.contains(text))
        _searchResult.add(userDetail);
    });

    setState(() {});
  }
}

List<UserDetails> _searchResult = [];

List<UserDetails> _userDetails = [];

final String url = 'https://jsonplaceholder.typicode.com/users';
class UserDetails {
  final int id;
  final String firstName, lastName, profileUrl;

  UserDetails({this.id, this.firstName, this.lastName, this.profileUrl = 'https://i.amz.mshcdn.com/3NbrfEiECotKyhcUhgPJHbrL7zM=/950x534/filters:quality(90)/2014%2F06%2F02%2Fc0%2Fzuckheadsho.a33d0.jpg'});

  factory UserDetails.fromJson(Map<String, dynamic> json) {
    return new UserDetails(
      id: json['id'],
      firstName: json['name'],
      lastName: json['username'],
    );
  }
}

Answer 2

使用SearchDelegate（空安全）：

完整代码：

class SearchPage extends StatefulWidget {
  @override
  _SearchPageState createState() => _SearchPageState();
}

class _SearchPageState extends State<SearchPage> {
  String? _result;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Search')),
      body: Center(
        child: Column(
          children: <Widget>[
            Text(_result ?? '', style: TextStyle(fontSize: 18)),
            ElevatedButton(
              onPressed: () async {
                var result = await showSearch<String>(
                  context: context,
                  delegate: CustomDelegate(),
                );
                setState(() => _result = result);
              },
              child: Text('Search'),
            ),
          ],
        ),
      ),
    );
  }
}

class CustomDelegate extends SearchDelegate<String> {
  List<String> data = nouns.take(100).toList();

  @override
  List<Widget> buildActions(BuildContext context) => [IconButton(icon: Icon(Icons.clear), onPressed: () => query = '')];

  @override
  Widget buildLeading(BuildContext context) => IconButton(icon: Icon(Icons.chevron_left), onPressed: () => close(context, ''));

  @override
  Widget buildResults(BuildContext context) => Container();

  @override
  Widget buildSuggestions(BuildContext context) {
    var listToShow;
    if (query.isNotEmpty)
      listToShow = data.where((e) => e.contains(query) && e.startsWith(query)).toList();
    else
      listToShow = data;

    return ListView.builder(
      itemCount: listToShow.length,
      itemBuilder: (_, i) {
        var noun = listToShow[i];
        return ListTile(
          title: Text(noun),
          onTap: () => close(context, noun),
        );
      },
    );
  }
}

Answer 3

我正在学习 Flutter 并正在寻找一个可搜索的列表，@Vinoth Kumar 的例子做得很好。

我已将代码拆分为不同的文件，并将 HomePage 主体简化为几种方法，以使其更易于维护/可读，我认为这值得分享。

main.dart

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

void main() => runApp(new MaterialApp(
      home: new HomePage(),
      debugShowCheckedModeBanner: false,
    ));

homepage.dart

import 'dart:async';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:flutter/material.dart';
import 'userDetails.dart';

class HomePage extends StatefulWidget {
  HomePage({Key key}) : super(key: key);

  @override
  _HomePageState createState() => new _HomePageState();
}

class _HomePageState extends State<HomePage> {
  List<UserDetails> _searchResult = [];
  List<UserDetails> _userDetails = [];
  TextEditingController controller = new TextEditingController();

  // Get json result and convert it to model. Then add
  Future<Null> getUserDetails() async {
    final response = await http.get(url);
    final responseJson = json.decode(response.body);

    setState(() {
      for (Map user in responseJson) {
        _userDetails.add(UserDetails.fromJson(user));
      }
    });
  }

  @override
  void initState() {
    super.initState();

    getUserDetails();
  }

  Widget _buildUsersList() {
    return new ListView.builder(
      itemCount: _userDetails.length,
      itemBuilder: (context, index) {
        return new Card(
          child: new ListTile(
            leading: new CircleAvatar(
              backgroundImage: new NetworkImage(
                _userDetails[index].profileUrl,
              ),
            ),
            title: new Text(_userDetails[index].firstName +
                ' ' +
                _userDetails[index].lastName),
          ),
          margin: const EdgeInsets.all(0.0),
        );
      },
    );
  }

  Widget _buildSearchResults() {
    return new ListView.builder(
      itemCount: _searchResult.length,
      itemBuilder: (context, i) {
        return new Card(
          child: new ListTile(
            leading: new CircleAvatar(
              backgroundImage: new NetworkImage(
                _searchResult[i].profileUrl,
              ),
            ),
            title: new Text(
                _searchResult[i].firstName + ' ' +_searchResult[i].lastName),
          ),
          margin: const EdgeInsets.all(0.0),
        );
      },
    );
  }

  Widget _buildSearchBox() {
    return new Padding(
      padding: const EdgeInsets.all(8.0),
      child: new Card(
        child: new ListTile(
          leading: new Icon(Icons.search),
          title: new TextField(
            controller: controller,
            decoration: new InputDecoration(
                hintText: 'Search', border: InputBorder.none),
            onChanged: onSearchTextChanged,
          ),
          trailing: new IconButton(
            icon: new Icon(Icons.cancel),
            onPressed: () {
              controller.clear();
              onSearchTextChanged('');
            },
          ),
        ),
      ),
    );
  }

  Widget _buildBody() {
    return new Column(
      children: <Widget>[
        new Container(
            color: Theme.of(context).primaryColor, child: _buildSearchBox()),
        new Expanded(
            child: _searchResult.length != 0 || controller.text.isNotEmpty
                ? _buildSearchResults()
                : _buildUsersList()),
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Home'),
        elevation: 0.0,
      ),
      body: _buildBody(),
      resizeToAvoidBottomPadding: true,
    );
  }

  onSearchTextChanged(String text) async {
    _searchResult.clear();
    if (text.isEmpty) {
      setState(() {});
      return;
    }

    _userDetails.forEach((userDetail) {
      if (userDetail.firstName.contains(text) ||
          userDetail.lastName.contains(text)) _searchResult.add(userDetail);
    });

    setState(() {});
  }
}

userDetails.dart

import 'package:flutter/material.dart';

final String url = 'https://jsonplaceholder.typicode.com/users';
class UserDetails {
  final int id;
  final String firstName, lastName, profileUrl;

  UserDetails({this.id, this.firstName, this.lastName, this.profileUrl = 'https://i.amz.mshcdn.com/3NbrfEiECotKyhcUhgPJHbrL7zM=/950x534/filters:quality(90)/2014%2F06%2F02%2Fc0%2Fzuckheadsho.a33d0.jpg'});

  factory UserDetails.fromJson(Map<String, dynamic> json) {
    return new UserDetails(
      id: json['id'],
      firstName: json['name'],
      lastName: json['username'],
    );
  }
}

Answer 4

参考Vinoth Kumar的答案，最好注意区分.contains()大小写。因此，要穷尽所有匹配项，您可以将字符串转换为小写：

_userDetails.forEach((userDetail) {
    if (userDetail.firstName.toLowerCase().contains(text.toLowerCase()) || userDetail.lastName.toLowerCase().contains(text.toLowerCase()))
      _searchResult.add(userDetail);
 });

非常适合我。

Answer 5

在 Flutter 中，我们必须使用自定义过滤器小部件进行管理，并且必须比较两个不同的对象列表。如

if (country.name.toLowerCase().contains(searchQuery) ||
          country.name.contains(searchQuery)) {
        filteredRecored.add(country);
      }

我在这里找到了例子