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

  1. 导入必要的库

    import 'package:flutter/material.dart';
    import 'package:flutter/services.dart';
    import 'package:mklocal_search/mklocal_search.dart';
    
  2. 创建MklocalSearch实例

    final _mklocalSearchPlugin = MklocalSearch();
    
  3. 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;
      });
    }
    
  4. 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

1 回复

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]),
                );
              },
            ),
          ),
        ],
      ),
    );
  }
}
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