借助帮助@aziza，我用下面的列表过滤器编写了搜索视图的详细代码段。对别人有帮助
import 'package:flutter/material.dart';class SearchList extends StatefulWidget { SearchList({ Key key }) : super(key: key); @override _SearchListState createState() => new _SearchListState();}class _SearchListState extends State<SearchList>{ Widget appBarTitle = new Text("Search Sample", style: new TextStyle(color: Colors.white),); Icon actionIcon = new Icon(Icons.search, color: Colors.white,); final key = new GlobalKey<ScaffoldState>(); final TextEditingController _searchQuery = new TextEditingController(); List<String> _list; bool _IsSearching; String _searchText = ""; _SearchListState() { _searchQuery.addListener(() { if (_searchQuery.text.isEmpty) { setState(() { _IsSearching = false; _searchText = ""; }); } else { setState(() { _IsSearching = true; _searchText = _searchQuery.text; }); } }); } @override void initState() { super.initState(); _IsSearching = false; init(); } void init() { _list = List(); _list.add("Google"); _list.add("IOS"); _list.add("Andorid"); _list.add("Dart"); _list.add("Flutter"); _list.add("Python"); _list.add("React"); _list.add("Xamarin"); _list.add("Kotlin"); _list.add("Java"); _list.add("RxAndroid"); } @override Widget build(BuildContext context) { return new Scaffold( key: key, appBar: buildBar(context), body: new ListView( padding: new EdgeInsets.symmetric(vertical: 8.0), children: _IsSearching ? _buildSearchList() : _buildList(), ), ); } List<ChildItem> _buildList() { return _list.map((contact) => new ChildItem(contact)).toList(); } List<ChildItem> _buildSearchList() { if (_searchText.isEmpty) { return _list.map((contact) => new ChildItem(contact)) .toList(); } else { List<String> _searchList = List(); for (int i = 0; i < _list.length; i++) { String name = _list.elementAt(i); if (name.toLowerCase().contains(_searchText.toLowerCase())) { _searchList.add(name); } } return _searchList.map((contact) => new ChildItem(contact)) .toList(); } } Widget buildBar(BuildContext context) { return new AppBar( centerTitle: true, title: appBarTitle, actions: <Widget>[ new IconButton(icon: actionIcon, onPressed: () { setState(() { if (this.actionIcon.icon == Icons.search) { this.actionIcon = new Icon(Icons.close, color: Colors.white,); this.appBarTitle = new TextField( controller: _searchQuery, style: new TextStyle( color: Colors.white, ), decoration: new InputDecoration(prefixIcon: new Icon(Icons.search, color: Colors.white),hintText: "Search...",hintStyle: new TextStyle(color: Colors.white) ), ); _handleSearchStart(); } else { _handleSearchEnd(); } }); },), ] ); } void _handleSearchStart() { setState(() { _IsSearching = true; }); } void _handleSearchEnd() { setState(() { this.actionIcon = new Icon(Icons.search, color: Colors.white,); this.appBarTitle = new Text("Search Sample", style: new TextStyle(color: Colors.white),); _IsSearching = false; _searchQuery.clear(); }); }}class ChildItem extends StatelessWidget { final String name; ChildItem(this.name); @override Widget build(BuildContext context) { return new ListTile(title: new Text(this.name)); }}输出：
