Flutter本地搜索插件mklocal_search的使用
Flutter本地搜索插件mklocal_search的使用
在本教程中,我们将介绍如何在Flutter项目中使用mklocal_search
插件来实现本地搜索功能。此插件可以帮助我们通过自然语言查询获取附近的地点信息。
安装插件
首先,在您的pubspec.yaml
文件中添加mklocal_search
依赖:
dependencies:
mklocal_search: ^版本号
然后运行以下命令以安装依赖项:
flutter pub get
使用插件
接下来,我们将展示如何使用mklocal_search
插件来搜索附近的地点。
初始化插件
首先,创建一个MklocalSearch
实例并调用naturalLanguageQuery
方法来进行搜索。
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:mklocal_search/mklocal_search.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({super.key});
[@override](/user/override)
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
MklocalSearchResponse? searchResonse = null;
final _mklocalSearchPlugin = MklocalSearch();
[@override](/user/override)
void initState() {
super.initState();
initPlatformState();
}
// 平台消息是异步的,因此我们在异步方法中初始化。
Future<void> initPlatformState() async {
MklocalSearchResponse? _searchResonse;
// 平台消息可能会失败,因此我们使用try/catch捕获PlatformException。
// 我们还处理了消息可能返回null的情况。
try {
searchResonse =
await _mklocalSearchPlugin.naturalLanguageQuery("apple store");
} on PlatformException {
searchResonse = null;
}
// 如果小部件从树中移除时异步平台消息仍在飞行中,
// 我们希望丢弃回复而不是调用setState来更新我们的非存在的外观。
if (!mounted) return;
setState(() {
_searchResonse = searchResonse;
});
}
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Apple stores found:'),
),
body: Column(children: [
Expanded(
child: ListView.builder(
itemCount: searchResonse?.mapItems?.length ?? 0,
itemBuilder: (context, index) {
return Card(
child: Column(children: [
Text("Is current location:"),
Text(searchResonse?.mapItems?[index].isCurrentLocation == null
? "not avaible"
: searchResonse?.mapItems?[index].isCurrentLocation ??
false
? "Yes"
: "No"),
Text("Name:"),
Text(searchResonse?.mapItems?[index].name ?? ""),
Text("Phone:"),
Text(searchResonse?.mapItems?[index].phoneNumber ?? ""),
Text("Website:"),
Text(searchResonse?.mapItems?[index].url ?? ""),
Text("Placemark data:"),
Text("Country:"),
Text(
searchResonse?.mapItems?[index].placemark?.country ?? ""),
Text("Country code:"),
Text(searchResonse
?.mapItems?[index].placemark?.isoCountryCode ??
""),
Text("Postal code:"),
Text(searchResonse?.mapItems?[index].placemark?.postalCode ??
""),
Text("Administrative area:"),
Text(searchResonse
?.mapItems?[index].placemark?.administrativeArea ??
""),
Text("Locality:"),
Text(searchResonse?.mapItems?[index].placemark?.locality ??
""),
Text("Thoroughfare:"),
Text(
searchResonse?.mapItems?[index].placemark?.thoroughfare ??
""),
Text("Sub thoroughfare:"),
Text(searchResonse
?.mapItems?[index].placemark?.subThoroughfare ??
""),
Text("Name:"),
Text(searchResonse?.mapItems?[index].placemark?.name ?? ""),
Text("Location data:"),
Text("Latitude:"),
Text(searchResonse?.mapItems?[index].placemark?.location
?.coordinate?.latitude
.toString() ??
""),
Text("Longitude:"),
Text(searchResonse?.mapItems?[index].placemark?.location
?.coordinate?.longitude
.toString() ??
""),
Text("Altitude:"),
Text(searchResonse
?.mapItems?[index].placemark?.location?.altitude
.toString() ??
""),
Text("Horizontal accuracy:"),
Text(searchResonse?.mapItems?[index].placemark?.location
?.horizontalAccuracy
.toString() ??
""),
Text("Vertical accuracy:"),
Text(searchResonse?.mapItems?[index].placemark?.location
?.verticalAccuracy
.toString() ??
""),
Text("Speed:"),
Text(searchResonse
?.mapItems?[index].placemark?.location?.speed
.toString() ??
""),
Text("Course:"),
Text(searchResonse
?.mapItems?[index].placemark?.location?.course
.toString() ??
""),
Text("Timestamp:"),
Text(searchResonse
?.mapItems?[index].placemark?.location?.timestamp
.toString() ??
""),
]));
},
),
),
]),
),
);
}
}
示例代码解释
-
导入必要的库:
import 'package:flutter/material.dart'; import 'package:flutter/services.dart'; import 'package:mklocal_search/mklocal_search.dart';
-
创建
MklocalSearch
实例:final _mklocalSearchPlugin = MklocalSearch();
-
初始化平台状态:
Future<void> initPlatformState() async { MklocalSearchResponse? _searchResonse; try { searchResonse = await _mklocalSearchPlugin.naturalLanguageQuery("apple store"); } on PlatformException { searchResonse = null; } if (!mounted) return; setState(() { _searchResonse = searchResonse; }); }
-
构建UI:
[@override](/user/override) Widget build(BuildContext context) { return MaterialApp( home: Scaffold( appBar: AppBar( title: const Text('Apple stores found:'), ), body: Column(children: [ Expanded( child: ListView.builder( itemCount: searchResonse?.mapItems?.length ?? 0, itemBuilder: (context, index) { return Card( child: Column(children: [ // 显示每个地点的信息 ])); }, ), ), ]), ), ); }
更多关于Flutter本地搜索插件mklocal_search的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter本地搜索插件mklocal_search的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
mklocal_search
是一个用于在 Flutter 应用中实现本地搜索的插件。它允许你在本地数据中进行搜索,并返回匹配的结果。以下是如何使用 mklocal_search
插件的基本步骤:
1. 添加依赖
首先,你需要在 pubspec.yaml
文件中添加 mklocal_search
插件的依赖:
dependencies:
flutter:
sdk: flutter
mklocal_search: ^1.0.0 # 请确保使用最新版本
然后运行 flutter pub get
来获取依赖。
2. 导入插件
在你的 Dart 文件中导入 mklocal_search
插件:
import 'package:mklocal_search/mklocal_search.dart';
3. 初始化本地搜索
你可以通过 LocalSearch
类来初始化本地搜索。通常你需要提供一个数据列表和一个搜索函数。
final localSearch = LocalSearch<String>(
items: ['Apple', 'Banana', 'Orange', 'Mango', 'Pineapple'],
searchFunction: (item, query) {
return item.toLowerCase().contains(query.toLowerCase());
},
);
4. 执行搜索
使用 search
方法来执行搜索,并获取匹配的结果。
void search(String query) {
final results = localSearch.search(query);
print(results); // 输出匹配的结果
}
5. 在 UI 中使用
你可以将搜索结果绑定到 UI 组件中,例如 ListView
,以显示匹配的项。
class SearchPage extends StatefulWidget {
[@override](/user/override)
_SearchPageState createState() => _SearchPageState();
}
class _SearchPageState extends State<SearchPage> {
final localSearch = LocalSearch<String>(
items: ['Apple', 'Banana', 'Orange', 'Mango', 'Pineapple'],
searchFunction: (item, query) {
return item.toLowerCase().contains(query.toLowerCase());
},
);
String query = '';
List<String> results = [];
void onSearchChanged(String newQuery) {
setState(() {
query = newQuery;
results = localSearch.search(newQuery);
});
}
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Local Search'),
),
body: Column(
children: [
TextField(
onChanged: onSearchChanged,
decoration: InputDecoration(
labelText: 'Search',
),
),
Expanded(
child: ListView.builder(
itemCount: results.length,
itemBuilder: (context, index) {
return ListTile(
title: Text(results[index]),
);
},
),
),
],
),
);
}
}