Flutter传感器访问插件all_sensors2的使用

All Sensors Flutter Plugin

All Sensors Flutter Plugin是一个Flutter插件，用于获取所有传感器的数据。它支持以下几种传感器类型：[Accelerometer（加速度计）, Gyroscope（陀螺仪）, Proximity（接近传感器）]。

在接近传感器中，如果值为true，则屏幕将关闭。您必须在AndroidManifest.xml中添加WAKE_LOCK权限：

<uses-permission android:name="android.permission.WAKE_LOCK" />

使用方法

要使用此插件，请按照以下步骤操作：

1. 在您的pubspec.yaml文件中添加all_sensors2作为依赖项。
2. 导入包并实例化所需的变量来存储传感器数据。
3. 订阅传感器事件流，并在接收到新数据时更新状态。

示例代码

下面是一个完整的示例demo，展示了如何使用all_sensors2插件来读取和显示来自设备传感器的数据：

import 'dart:async';

import 'package:all_sensors2/all_sensors2.dart';
import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Sensors Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, this.title}) : super(key: key);

  final String? title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  List<double> _accelerometerValues = <double>[];
  List<double> _userAccelerometerValues = <double>[];
  List<double> _gyroscopeValues = <double>[];
  bool _proximityValues = false;
  List<StreamSubscription<dynamic>> _streamSubscriptions = <StreamSubscription<dynamic>>[];

  @override
  Widget build(BuildContext context) {
    final List<String> accelerometer =
        _accelerometerValues.map((double v) => v.toStringAsFixed(1)).toList();
    final List<String> gyroscope =
        _gyroscopeValues.map((double v) => v.toStringAsFixed(1)).toList();
    final List<String> userAccelerometer = _userAccelerometerValues
        .map((double v) => v.toStringAsFixed(1))
        .toList();

    return Scaffold(
      appBar: AppBar(
        title: const Text('Sensor Example'),
      ),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: <Widget>[
          Padding(
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: <Widget>[
                Text('Accelerometer: $accelerometer'),
              ],
            ),
            padding: const EdgeInsets.all(16.0),
          ),
          Padding(
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: <Widget>[
                Text('UserAccelerometer: $userAccelerometer'),
              ],
            ),
            padding: const EdgeInsets.all(16.0),
          ),
          Padding(
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: <Widget>[
                Text('Gyroscope: $gyroscope'),
              ],
            ),
            padding: const EdgeInsets.all(16.0),
          ),
          Padding(
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: <Widget>[
                Text('Proximity: $_proximityValues'),
              ],
            ),
            padding: const EdgeInsets.all(16.0),
          ),
        ],
      ),
    );
  }

  @override
  void dispose() {
    super.dispose();
    for (StreamSubscription<dynamic> subscription in _streamSubscriptions) {
      subscription.cancel();
    }
  }

  @override
  void initState() {
    super.initState();
    _streamSubscriptions
        .add(accelerometerEvents!.listen((AccelerometerEvent event) {
      setState(() {
        _accelerometerValues = <double>[event.x, event.y, event.z];
      });
    }));
    _streamSubscriptions.add(gyroscopeEvents!.listen((GyroscopeEvent event) {
      setState(() {
        _gyroscopeValues = <double>[event.x, event.y, event.z];
      });
    }));

    _streamSubscriptions
        .add(userAccelerometerEvents!.listen((UserAccelerometerEvent event) {
      setState(() {
        _userAccelerometerValues = <double>[event.x, event.y, event.z];
      });
    }));
    _streamSubscriptions.add(proximityEvents!.listen((ProximityEvent event) {
      setState(() {
        _proximityValues = event.getValue();
      });
    }));
  }
}

这个示例应用程序创建了一个简单的UI，用于实时显示来自加速度计、用户加速度计、陀螺仪和接近传感器的数据。当传感器数据发生变化时，应用程序会自动更新UI以反映最新的传感器读数。