Flutter地理围栏功能插件flutter_geofencing_plugin的使用

简介

flutter_geofencing 是一个用于在 Flutter 应用中实现地理围栏功能的插件。通过该插件，您可以轻松地创建、添加和移除地理围栏，并在用户进入或离开这些围栏时触发相应的事件。

准备工作

在开始之前，请确保您的 Flutter 环境已经设置好，并且安装了 flutter_geofencing_plugin 插件。您可以通过以下命令安装插件：

flutter pub add flutter_geofencing_plugin

Android 配置

为了在 Android 平台上使用地理围栏功能，您需要在 AndroidManifest.xml 文件中进行一些配置。

1. 注册后台服务：

   <receiver
       android:name="com.example.flutter_geofencing.GeofenceBroadcastReceiver"
       android:enabled="true"
       android:exported="true" />
   
   <service
       android:name="com.example.flutter_geofencing.geofencing.GeofenceTransitionsJobIntentService"
       android:exported="true"
       android:permission="android.permission.BIND_JOB_SERVICE" />
   

2. 请求必要的权限：

   <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
   <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
   <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
   <uses-permission android:name="android.permission.WAKE_LOCK" />
   <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
   

示例代码

以下是一个简单的示例代码，展示了如何使用 flutter_geofencing_plugin 插件来添加和移除地理围栏。

示例代码

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

import 'package:flutter/services.dart';
import 'package:flutter_geofencing_plugin/flutter_geofencing.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  dynamic geoFence;
  final _flutterGeofencingPlugin = FlutterGeofencing();

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            // 添加地理围栏按钮
            MaterialButton(
              onPressed: () async {
                // 添加一个半径为500米的地理围栏
                geoFence = await _flutterGeofencingPlugin.addGeoFence(
                  id: '123',
                  lat: 31.475839994232548, // 经度
                  long: 74.3425799238205,   // 纬度
                  radius: 500               // 半径
                );
              },
              child: Text("Add GeoFence"),
            ),
            SizedBox(height: 20,),
            // 移除地理围栏按钮
            MaterialButton(
              onPressed: () async {
                // 移除当前地理围栏
                geoFence = await _flutterGeofencingPlugin.removeGeoFence();
              },
              child: Text("Remove GeoFence"),
            )
          ],
        ),
      ),
    );
  }
}

代码解释

• 导入包：

  import 'package:flutter/material.dart';
  import 'dart:async';
  import 'package:flutter/services.dart';
  import 'package:flutter_geofencing_plugin/flutter_geofencing.dart';
  

  这些导入语句引入了所需的 Flutter 包和 flutter_geofencing_plugin 插件。

• 主函数：

  void main() {
    runApp(const MyApp());
  }
  

  主函数启动应用。

• MyApp 类：

  class MyApp extends StatefulWidget {
    const MyApp({super.key});
  
    @override
    State<MyApp> createState() => _MyAppState();
  }
  

  定义了一个状态类 _MyAppState 来管理应用的状态。

• _MyAppState 类：

  class _MyAppState extends State<MyApp> {
    dynamic geoFence;
    final _flutterGeofencingPlugin = FlutterGeofencing();
  
    @override
    void initState() {
      super.initState();
    }
  
    @override
    Widget build(BuildContext context) {
      return MaterialApp(
        home: Scaffold(
          appBar: AppBar(
            title: const Text('Plugin example app'),
          ),
          body: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              // 添加地理围栏按钮
              MaterialButton(
                onPressed: () async {
                  // 添加一个半径为500米的地理围栏
                  geoFence = await _flutterGeofencingPlugin.addGeoFence(
                    id: '123',
                    lat: 31.475839994232548, // 经度
                    long: 74.3425799238205,   // 纬度
                    radius: 500               // 半径
                  );
                },
                child: Text("Add GeoFence"),
              ),
              SizedBox(height: 20,),
              // 移除地理围栏按钮
              MaterialButton(
                onPressed: () async {
                  // 移除当前地理围栏
                  geoFence = await _flutterGeofencingPlugin.removeGeoFence();
                },
                child: Text("Remove GeoFence"),
              )
            ],
          ),
        ),
      );
    }
  }