Flutter传感器访问插件simple_sensor的使用

simple_sensor 是一个用于访问Android和iOS设备上的加速度计、陀螺仪、磁力计和方向传感器的Flutter插件。本文将详细介绍如何在Flutter项目中使用这个插件，并提供一个完整的示例Demo。

开始使用

首先，你需要在项目的 pubspec.yaml 文件中添加 simple_sensor 作为依赖项：

dependencies:
  simple_sensor: ^0.1.4

然后，在你的Dart文件中导入该插件：

import 'package:simple_sensor/simple_sensor.dart';

传感器事件

加速度计

加速度计测量设备相对于自由落体所经历的加速度。

motionSensors.accelerometer.listen((AccelerometerEvent event) {
    print('X: ${event.x}');
    print('Y: ${event.y}');
    print('Z: ${event.z}');
});

陀螺仪

陀螺仪测量设备绕三个轴的旋转速率（单位：弧度/秒）。

motionSensors.gyroscope.listen((GyroscopeEvent event) {
    print('X: ${event.x}');
    print('Y: ${event.y}');
    print('Z: ${event.z}');
});

磁力计

磁力计测量环境地磁场强度，单位为微特斯拉（μT）。

motionSensors.magnetometer.listen((MagnetometerEvent event) {
    print('X: ${event.x}');
    print('Y: ${event.y}');
    print('Z: ${event.z}');
});

绝对方向

该插件还提供了设备绝对方向的信息，包括偏航角、俯仰角和滚转角。

motionSensors.absoluteOrientation.listen((AbsoluteOrientationEvent event) {
    print('Yaw: ${event.yaw}');
    print('Pitch: ${event.pitch}');
    print('Roll: ${event.roll}');
});

完整示例Demo

下面是一个完整的示例代码，展示了如何使用 simple_sensor 插件来获取各种传感器的数据并在UI上显示这些数据：

import 'package:flutter/material.dart';
import 'package:vector_math/vector_math_64.dart' hide Colors;
import 'package:simple_sensor/simple_sensor.dart';

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

class MyApp extends StatefulWidget {
  [@override](/user/override)
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  Vector3 _accelerometer = Vector3.zero();
  Vector3 _gyroscope = Vector3.zero();
  Vector3 _magnetometer = Vector3.zero();
  Vector3 _userAccelerometer = Vector3.zero();
  Vector3 _orientation = Vector3.zero();
  Vector3 _absoluteOrientation = Vector3.zero();
  Vector3 _absoluteOrientation2 = Vector3.zero();
  double? _screenOrientation = 0;

  int? _groupValue = 0;

  [@override](/user/override)
  void initState() {
    super.initState();
    // 监听各个传感器事件并更新状态
    simpleSensor.gyroscope.listen((GyroscopeEvent event) {
      setState(() {
        _gyroscope.setValues(event.x, event.y, event.z);
      });
    });

    simpleSensor.accelerometer.listen((AccelerometerEvent event) {
      setState(() {
        _accelerometer.setValues(event.x, event.y, event.z);
      });
    });

    simpleSensor.userAccelerometer.listen((UserAccelerometerEvent event) {
      setState(() {
        _userAccelerometer.setValues(event.x, event.y, event.z);
      });
    });

    simpleSensor.magnetometer.listen((MagnetometerEvent event) {
      setState(() {
        _magnetometer.setValues(event.x, event.y, event.z);
        var matrix = simpleSensor.getRotationMatrix(_accelerometer, _magnetometer);
        _absoluteOrientation2.setFrom(simpleSensor.getOrientation(matrix));
      });
    });

    simpleSensor.isOrientationAvailable().then((available) {
      if (available) {
        simpleSensor.orientation.listen((OrientationEvent event) {
          setState(() {
            _orientation.setValues(event.yaw, event.pitch, event.roll);
          });
        });
      }
    });

    simpleSensor.absoluteOrientation.listen((AbsoluteOrientationEvent event) {
      setState(() {
        _absoluteOrientation.setValues(event.yaw, event.pitch, event.roll);
      });
    });

    simpleSensor.screenOrientation.listen((ScreenOrientationEvent event) {
      setState(() {
        _screenOrientation = event.angle;
      });
    });
  }

  void setUpdateInterval(int? groupValue, int interval) {
    simpleSensor.accelerometerUpdateInterval = interval;
    simpleSensor.userAccelerometerUpdateInterval = interval;
    simpleSensor.gyroscopeUpdateInterval = interval;
    simpleSensor.magnetometerUpdateInterval = interval;
    simpleSensor.orientationUpdateInterval = interval;
    simpleSensor.absoluteOrientationUpdateInterval = interval;
    setState(() {
      _groupValue = groupValue;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Simple Sensor'),
        ),
        body: SingleChildScrollView(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text('Update Interval'),
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Radio(
                    value: 1,
                    groupValue: _groupValue,
                    onChanged: (dynamic value) => setUpdateInterval(value, Duration.microsecondsPerSecond ~/ 1),
                  ),
                  Text("1 FPS"),
                  Radio(
                    value: 2,
                    groupValue: _groupValue,
                    onChanged: (dynamic value) => setUpdateInterval(value, Duration.microsecondsPerSecond ~/ 30),
                  ),
                  Text("30 FPS"),
                  Radio(
                    value: 3,
                    groupValue: _groupValue,
                    onChanged: (dynamic value) => setUpdateInterval(value, Duration.microsecondsPerSecond ~/ 60),
                  ),
                  Text("60 FPS"),
                ],
              ),
              // 其他传感器数据显示...
              Text('Accelerometer'),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                children: <Widget>[
                  Text('${_accelerometer.x.toStringAsFixed(4)}'),
                  Text('${_accelerometer.y.toStringAsFixed(4)}'),
                  Text('${_accelerometer.z.toStringAsFixed(4)}'),
                ],
              ),
              // 添加其他传感器的显示部分...
            ],
          ),
        ),
      ),
    );
  }
}