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Xamarin.Forms で Micorosft Band の心拍数センサー値を取得する

今回は Xamarin.Forms で心拍数センサー値を取得してみます

ソースコードの一式は下記にあります!

細かい実装などはこちらを参照ください

github.com

※ 順次改修していく予定なので、この記事の内容が現時点のソースより古い可能性があります

ほぼこれまでの実装の仕方と同じなのでこなれてきました

心拍数データのいれものは iOSAndroid でほぼ変わりません

/// <summary>
/// iOS 用心拍数データ
/// </summary>
public class NativeBandHeartRateReading : IBandHeartRateReading
{
    /// <summary>
    /// コンストラクタ
    /// </summary>
    /// <param name="data">センサーデータ</param>
    public NativeBandHeartRateReading(Native.Sensors.BandSensorHeartRateData data)
    {
        this.Timestamp = DateTime.Now;
    this.HeartRate = (int)data.HeartRate;

        if (data.Quality == Native.Sensors.HeartRateQuality.Locked)
        {
            this.Quality = HeartRateQuality.Locked;
        }
        if (data.Quality == Native.Sensors.HeartRateQuality.Acquiring)
        {
            this.Quality = HeartRateQuality.Acquiring;
        }
    }

    /// <summary>
    /// 検出日時
    /// </summary>
    public DateTimeOffset Timestamp { get; private set; }

    /// <summary>
    /// 心拍数
    /// </summary>
    public int HeartRate { get; private set; }

    /// <summary>
    /// 計測状況
    /// </summary>
    public HeartRateQuality Quality { get; private set; }
}

iOS が心拍数が nuint という特殊な型で来るので、int にキャストしています

次にセンサー制御側

/// <summary>
/// iOS 用心拍数センサー
/// </summary>
public class NativeBandHeartRateSensor : NativeBandSensorBase<IBandHeartRateReading>
{
    /// <summary>
    /// 心拍数センサー
    /// </summary>
    private Native.Sensors.HeartRateSensor sensor = null;

    /// <summary>
    /// センサー値変更イベント
    /// </summary>
    public override event EventHandler<BandSensorReadingEventArgs<IBandHeartRateReading>> ReadingChanged;

    /// <summary>
    /// コンストラクタ
    /// </summary>
    /// <param name="manager">Band センサー管理クラス</param>
    public NativeBandHeartRateSensor(Native.Sensors.IBandSensorManager manager)
        : base(manager)
    {
        this.sensor = Native.Sensors.BandSensorManagerExtensions.CreateHeartRateSensor(manager);
        this.sensor.ReadingChanged += this.OnReadingChanged;
    }

    /// <summary>
    /// センサー値変更イベントハンドラ
    /// </summary>
    /// <param name="sender">イベント発行者</param>
    /// <param name="e">イベント引数</param>
    private void OnReadingChanged(object sender, Native.Sensors.BandSensorDataEventArgs<Native.Sensors.BandSensorHeartRateData> e)
    {
        if (this.ReadingChanged == null)
        {
            return;
        }
        this.ReadingChanged.Invoke(
            this, new BandSensorReadingEventArgs<IBandHeartRateReading>(new NativeBandHeartRateReading(e.SensorReading)));
    }

    /// <summary>
    /// センサー検知を開始する
    /// </summary>
    /// <returns>Task</returns>
    public override Task StartReadingsAsync()
    {
        return Task.Run(() => this.sensor.StartReadings());
    }

    /// <summary>
    /// センサー検知を停止する
    /// </summary>
    /// <returns>Task</returns>
    public override Task StopReadingsAsync()
    {
        return Task.Run(() => this.sensor.StopReadings());
    }
}

iOS のセンサー制御クラスはこんな感じで

/// <summary>
/// Android 用心拍数センサー
/// </summary>
public class NativeBandHeartRateSensor : NativeBandSensorBase<IBandHeartRateReading>
{
    /// <summary>
    /// 心拍数センサー
    /// </summary>
    private Native.Sensors.HeartRateSensor sensor = null;

    /// <summary>
    /// センサー値変更イベント
    /// </summary>
    public override event EventHandler<BandSensorReadingEventArgs<IBandHeartRateReading>> ReadingChanged;

    /// <summary>
    /// コンストラクタ
    /// </summary>
    /// <param name="manager">Band センサー管理クラス</param>
    public NativeBandHeartRateSensor(Native.Sensors.IBandSensorManager manager)
        : base(manager)
    {
        this.sensor = Native.Sensors.BandSensorManagerExtensions.CreateHeartRateSensor(manager);
        this.sensor.ReadingChanged += this.OnReadingChanged;
    }

    /// <summary>
    /// センサー値変更イベントハンドラ
    /// </summary>
    /// <param name="sender">イベント発行者</param>
    /// <param name="e">イベント引数</param>
    private void OnReadingChanged(object sender, Native.Sensors.IBandSensorEventEventArgs<Native.Sensors.IBandHeartRateEvent> e)
    {
        if (this.ReadingChanged == null)
        {
            return;
        }
        this.ReadingChanged.Invoke(
            this, new BandSensorReadingEventArgs<IBandHeartRateReading>(new NativeBandHeartRateReading(e.SensorReading)));
    }

    /// <summary>
    /// センサー検知を開始する
    /// </summary>
    /// <returns>Task</returns>
    public override Task StartReadingsAsync()
    {
        return this.sensor.StartReadingsTaskAsync();
    }

    /// <summary>
    /// センサー検知を停止する
    /// </summary>
    /// <returns>Task</returns>
    public override Task StopReadingsAsync()
    {
        return this.sensor.StopReadingsTaskAsync();
    }
}

Android はこうです・・・心拍数はサンプリングレートを設定しないようですね

あとは ViewModel を改修して

/// <summary>
/// センサー情報 ViewModel
/// </summary>
public class SensorReadingViewModel : BindableBase
{
    ~ 中略 ~
    
    #region HeartRateSensor

    /// <summary>
    /// 心拍数
    /// </summary>
    private int heartRate = 0;

    /// <summary>
    /// 心拍数
    /// </summary>
    public int HeartRate
    {
        get { return this.heartRate; }
        set { this.SetProperty<int>(ref this.heartRate, value); }
    }

    /// <summary>
    /// 心拍計測状況
    /// </summary>
    private HeartRateQuality heartRateQuality = HeartRateQuality.Acquiring;

    /// <summary>
    /// 心拍計測状況
    /// </summary>
    public HeartRateQuality HeartRateQuality
    {
        get { return this.heartRateQuality; }
        set { this.SetProperty<HeartRateQuality>(ref this.heartRateQuality, value); }
    }

    #endregion //HeartRateSensor

    ~ 中略 ~

    /// <summary>
    /// センサー監視切替
    /// </summary>
    /// <param name="detecting">センサー監視フラグ</param>
    /// <returns>Task</returns>
    private async Task ChangeDetectSensors(bool detecting)
    {
        if (detecting)
        {
            // 加速度センサーの検知開始
            if (this.client.SensorManager.Accelerometer.IsSupported)
            {
                await this.client.SensorManager.Accelerometer.StartReadingsAsync();
                this.client.SensorManager.Accelerometer.ReadingChanged += this.OnAccelerometerReadingChanged;
            }
            // ジャイロセンサーの検知開始
            if (this.client.SensorManager.Gyroscope.IsSupported)
            {
                await this.client.SensorManager.Gyroscope.StartReadingsAsync();
                this.client.SensorManager.Gyroscope.ReadingChanged += this.OnGyroscopeReadingChanged;
            }
            // 心拍数の検知開始
            if (this.client.SensorManager.HeartRate.IsSupported)
            {
                await this.client.SensorManager.HeartRate.StartReadingsAsync();
                this.client.SensorManager.HeartRate.ReadingChanged += this.OnHeartRateReadingChanged;
            }
        }
        else
        {
            // 加速度センサーの検知終了
            if (this.client.SensorManager.Accelerometer.IsSupported)
            {
                await this.client.SensorManager.Accelerometer.StopReadingsAsync();
                this.client.SensorManager.Accelerometer.ReadingChanged -= this.OnAccelerometerReadingChanged;
                this.AccelerationX = 0d;
                this.AccelerationY = 0d;
                this.AccelerationZ = 0d;
            }
            // ジャイロセンサーの検知終了
            if (this.client.SensorManager.Gyroscope.IsSupported)
            {
                await this.client.SensorManager.Gyroscope.StopReadingsAsync();
                this.client.SensorManager.Gyroscope.ReadingChanged -= this.OnGyroscopeReadingChanged;
                this.AngularVelocityX = 0d;
                this.AngularVelocityY = 0d;
                this.AngularVelocityZ = 0d;
                this.GyroAccelerationX = 0d;
                this.GyroAccelerationY = 0d;
                this.GyroAccelerationZ = 0d;
            }
            // 心拍数の検知終了
            if (this.client.SensorManager.HeartRate.IsSupported)
            {
                await this.client.SensorManager.HeartRate.StopReadingsAsync();
                this.client.SensorManager.HeartRate.ReadingChanged -= this.OnHeartRateReadingChanged;
                this.HeartRate = 0;
                this.HeartRateQuality = HeartRateQuality.Acquiring;
            }
        }
    }

    ~ 中略 ~

    /// <summary>
    /// 心拍数変更イベントハンドラ
    /// </summary>
    /// <param name="sender">イベント発行者</param>
    /// <param name="e">イベント引数</param>
    private void OnHeartRateReadingChanged(object sender, BandSensorReadingEventArgs<IBandHeartRateReading> e)
    {
        if (e == null)
        {
            return;
        }
        this.HeartRate = e.SensorReading.HeartRate;
        this.HeartRateQuality = e.SensorReading.Quality;
    }
}

画面の表示領域を用意

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:cv="clr-namespace:XamarinBandSample.Converters;assembly=XamarinBandSample"
             xmlns:t="clr-namespace:XamarinBandSample.Triggers;assembly=XamarinBandSample"
             xmlns:prismmvvm="clr-namespace:Prism.Mvvm;assembly=XamarinBandSample"
             prismmvvm:ViewModelLocator.AutoWireViewModel="true"
             x:Class="XamarinBandSample.Views.TopPage">
    ~ 中略 ~

    <!-- Sensor Info Pain-->
    <ScrollView IsVisible="{Binding ShowSensors}"
                Orientation="Vertical">
      <Grid Padding="10"
            RowSpacing="10"
            ColumnSpacing="10"
            BindingContext="{Binding SensorReading}">
        <Grid.RowDefinitions>
          <RowDefinition Height="Auto"/>
          <RowDefinition Height="Auto"/>
          <RowDefinition Height="Auto"/>
          <RowDefinition Height="Auto"/>
          <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
          <ColumnDefinition Width="100"/>
          <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <Label Text="Detecting"
               Grid.Column="0"
               Grid.Row="0"
               VerticalOptions="Center"
               FontSize="Medium"/>
        <Switch IsToggled="{Binding IsSensorDetecting}"
                Grid.Column="1"
                Grid.Row="0">
          <Switch.Triggers>
            <EventTrigger Event="Toggled">
              <t:InvokeCommandAction Command="{Binding ChangeDetectSensorsCommand}" 
                                     CommandParameter="{Binding IsSensorDetecting}"/>
            </EventTrigger>
          </Switch.Triggers>
        </Switch>

        <StackLayout Orientation="Horizontal"
                     Grid.Column="0"
                     Grid.ColumnSpan="2"
                     Grid.Row="1"
                     Spacing="5">

          <Label Text="Accelometer:"
                 FontSize="Medium"/>
          <StackLayout Orientation="Vertical"
                       Padding="10,0,0,0"
                       Spacing="10">
            <Label Text="{Binding AccelerationX, StringFormat='x={0}'}"
                   FontSize="Small"/>
            <Label Text="{Binding AccelerationY, StringFormat='y={0}'}"
                   FontSize="Small"/>
            <Label Text="{Binding AccelerationZ, StringFormat='z={0}'}"
                   FontSize="Small"/>
          </StackLayout>

        </StackLayout>

        <StackLayout Orientation="Horizontal"
                     Grid.Column="0"
                     Grid.ColumnSpan="2"
                     Grid.Row="2"
                     Spacing="5">

          <Label Text="Gyroscope:"
                 FontSize="Medium"/>
          <StackLayout Orientation="Vertical"
                       Padding="10,0,0,0"
                       Spacing="10">
            <Label Text="{Binding AngularVelocityX, StringFormat='x={0}'}"
                   FontSize="Small"/>
            <Label Text="{Binding AngularVelocityY, StringFormat='y={0}'}"
                   FontSize="Small"/>
            <Label Text="{Binding AngularVelocityZ, StringFormat='z={0}'}"
                   FontSize="Small"/>
            <Label Text="{Binding GyroAccelerationX, StringFormat='dx={0}'}"
                   FontSize="Small"/>
            <Label Text="{Binding GyroAccelerationY, StringFormat='dy={0}'}"
                   FontSize="Small"/>
            <Label Text="{Binding GyroAccelerationZ, StringFormat='dz={0}'}"
                   FontSize="Small"/>
          </StackLayout>

        </StackLayout>

        <StackLayout Orientation="Horizontal"
                     Grid.Column="0"
                     Grid.ColumnSpan="2"
                     Grid.Row="3"
                     Spacing="5">

          <Label Text="Heart Rate:"
                 FontSize="Medium"/>
          <StackLayout Orientation="Vertical"
                       Padding="10,0,0,0"
                       Spacing="10">
            <Label Text="{Binding HeartRate, StringFormat='rate={0}'}"
                   FontSize="Small"/>
            <Label Text="{Binding HeartRateQuality, StringFormat='status={0}'}"
                   FontSize="Small"/>
          </StackLayout>

        </StackLayout>
        
      </Grid>
    </ScrollView>
  </Grid>

</ContentPage>

いつものようにおためし実行

f:id:matatabi_ux:20150425153324p:plain

status のところも直接列挙型をバインドできてかんたんにできました