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距离上一次发文已经过去三个月了，三个月里发生了好多事情，然后忙这个忙那个也都没时间继续把这个有关 Band 开发的文章继续下去，今天正好有些时间，就把关于读取传感器数据的一些事情说了吧。
还有就是在10月6日的发布会上，微软发布了第二代微软手环，传感器更加丰富，使用曲面屏幕，以及各种牛逼的功能。就算在这里做个广告（不过能找到这篇文章的也都应该知道这件事情了吧。
然后这是 Band 2的宣传片（中文字幕）
http://www.bilibili.com/video/av3021636/
第二代MSBand的开发模式和第一代相差不大，所以之前Band 1开发所需的知识和2是通用的，包括SDK都是一样的。
好了扯了好多废话哈，那就赶快进入正题。
在微软手环上有如下传感器可供开发者使用：
|
Accelerometer |
加速度计 |
|
Altimeter |
高度计 |
|
Ambient Light |
氛围光传感器 |
|
Barometer |
大气压计 |
|
Calories |
卡路里 |
|
Gyroscope |
陀螺仪 |
|
Heart Rate |
心率传感器 |
|
Pedometer |
计步器 |
|
RR Interval |
心跳周期（间隔？） |
|
Skin Temperature |
皮肤温度 |
|
UV |
紫外线传感器 |
|
Distance |
距离传感器 |
|
GSR |
皮肤电阻传感器 |
这是微软文档中给出的各个传感器的属性
|
Type |
Property and description |
|
double |
AccelerationX The x-axis acceleration of the Band in g units (9.81 m/s2) |
|
double |
AccelerationY The y-axis acceleration of the Band in g units (9.81 m/s2) |
|
double |
AccelerationZ The z-axis acceleration of the Band in g units (9.81 m/s2) |
|
Type |
Property and description |
|
long |
FlightsAscended Number of floors ascended since the Band was last factory-reset |
|
long |
FlightsDescended Number of floors ascended since the Band was last factory-reset |
|
float |
Rate The current rate of ascend/descend in cm/s |
|
long |
SteppingGain Total elevation gained in centimeters by taking steps since the Band was last factory-reset |
|
long |
SteppingLoss Total elevation lost in centimeters by taking steps since the Band was last factory-reset |
|
long |
StepsAscended Total number of steps ascended since the Band was last factory-reset |
|
long |
StepsDescended Total number of steps descended since the Band was last factory-reset |
|
long |
TotalGain Total elevation gained in centimeters since the Band was last factory-reset |
|
long |
TotalLoss Total elevation loss in centimeters since the Band was last factory-reset |
|
Type |
Property and description |
|
int |
Brightness Current ambient light in lumens per square meter (lux) |
|
Type |
Property and description |
|
double |
AirPressure Current air pressure in hectopascals |
|
double |
Temperature Current temperature in degrees Celsius |
|
Type |
Property and description |
|
long |
Calories |
|
|
Number of kilocalories (kcals) burned since the Band was last factory-reset |
|
Type |
Property and description |
|
BandContactState |
State Current contact state of the Band |
|
Value and description |
|
NotWorn Value representing that the Band is currently not being worn |
|
Unknown Value representing that the contact state of the Band is unknown |
|
Worn Value representing that the Band is currently being worn |
|
Type |
Property and description |
|
MotionType |
CurrentMotion The current MotionType of the Band |
|
float |
Pace Current pace of the Band in ms/m |
|
float |
Speed Current speed of the Band in cm/s |
|
long |
TotalDistance Distance traveled in cm since the Band was last factory-reset |
|
Value and description |
|
Unknown Value representing that the mode of the Band user’s movement is currently unknown |
|
Idle Value representing that the user of the Band is currently idle |
|
Walking Value representing that the user of the Band is currently walking |
|
Jogging Value representing that the user of the Band is currently jogging |
|
Running Value representing that the user of the Band is currently running |
|
Type |
Property and description |
|
int |
Resistance Current skin resistance in kohms of the person wearing the Band |
|
Type |
Property and description |
|
double |
AngularVelocityX Angular velocity around the x-axis of the Band in degrees/sec |
|
double |
AngularVelocityY Angular velocity around the y-axis of the Band in degrees/sec |
|
double |
AngularVelocityZ Angular velocity around the z-axis of the Band in degrees/sec |
|
Type |
Property and description |
|
int |
HeartRate Current heart rate as read by the Band in beats/min |
|
HeartRateQuality |
Quality Quality of the current heart rate reading |
|
Value and description |
|
Acquiring Value representing that the Band hasn’t locked on to its user’s heart rate |
|
Locked Value representing that the Band has locked on to its user’s heart rate |
|
Type |
Property and description |
|
long |
TotalSteps Total number of steps taken since the Band was last factory-reset |
|
Type |
Property and description |
|
double |
Interval Current RR interval in seconds as read by the Band |
|
Type |
Property and description |
|
double |
Temperature Current temperature in degrees Celsius of the person wearing the Band |
|
Type |
Property and description |
|
UVIndexLevel |
IndexLevel Current UVIndexLevel value as calculated by the Band |
|
Value and description |
|
None Value representing a very low UV index level |
|
Low Value representing a low UV index level |
|
Medium Value representing a medium UV index level |
|
High Value representing a high UV index level |
|
VeryHigh Value representing a very high UV index level |
我抽空会吧这个表格整理出来方便大家使用，今天就先凑合看看，还没有翻译。
在获取传感器读数之前，要先将Band与手机配对并连接（关于如何和手环配对、连接和获取信息的内容，详见前一篇文章。）
using (IBandClient band = await BandClientManager.Instance.ConnectAsync(pairedBands[0])) { }
检查Band是否支持该传感器（此处以心率传感器为例），以及用户是否授权应用获取该传感器。如果不支持该传感器，则抛出异常。
如果用户尚未同意应用获取传感器，则弹出请求用户同意的对话框。
代码如下：
if (band.SensorManager.HeartRate.IsSupported) { if (band.SensorManager.HeartRate.GetCurrentUserConsent() == UserConsent.Granted) { //获取读数 } else { await band.SensorManager.HeartRate.RequestUserConsentAsync(); } } else { throw new Exception("Not supported."); }
控制Band 传感器读取开始和结束的两个方法分别是：StartReadingsAsync() 和 StopReadingsAsync()
IBandSensor<T> 包含一个事件“ReadingChanged”。每当传感器的状态发生改变时（开始读取时、停止读取时），都会触发这个事件。所以，我们要利用这个事件，来做一个简单的能够读取用户1分钟内心跳的小APP。在这一分钟里，每隔一秒都会触发一次这个事件，然后只要在触发时将当前心率添加到一个储存心率变化的List中即可。但是又如何实现这个持续读取1分中呢?
众所周知，Task类有一个Delay方法，利用这个方法就可以实现不阻塞UI线程情况下的延迟
Task.Delay(TimeSpan delay);
这里我们要让它等待一分钟，所以就是：
await Task.Delay(TimeSpan.FromSeconds(60));
这里的事件订阅，直接用 Lambda 写就OK了~
这样：
band.SensorManager.HeartRate.ReadingChanged += (sender, args) =>
{
}
这里的args 的类型是BandSensorReadingEventArgs<IBandHeartRateReading> 它的属性SensorReading.HeartRate 便是我们需要的心率数值。其他传感器大都同理，不再赘述。
再梳理一下思路吧：
获取已配对的Band列表 --> 选择列表中第一个进行Band连接 --> 判断设备是否支持心率传感器 --> 如果是，向用户请求获取传感器的授权 --> 订阅事件“ReadingChanged”（每秒获取一个读数并添加到 valueList 中） --> 开始读取传感器 --> Delay 1分钟 --> 结束传感器读取
好了，基础性的介绍就到这里，思路也差不多顺了，那就开始写代码吧。
完整的代码如下:
IList valueList = new List<Object>(); IBandInfo[] pairedBands = await BandClientManager.Instance.GetBandsAsync(); try { using (IBandClient band = await BandClientManager.Instance.ConnectAsync(pairedBands[0])) { if (band != null) { if (band.SensorManager.HeartRate.IsSupported) { if (band.SensorManager.HeartRate.GetCurrentUserConsent() == UserConsent.Granted) { band.SensorManager.HeartRate.ReadingChanged += (sender, args) => { valueList.Add(args.SensorReading.HeartRate); }; await band.SensorManager.HeartRate.StartReadingsAsync(); await Task.Delay(TimeSpan.FromSeconds(60)); await band.SensorManager.HeartRate.StopReadingsAsync(); } else { await band.SensorManager.HeartRate.RequestUserConsentAsync(); } } else { throw new Exception("Not supported."); } } } } catch { return null; } return valueList;
嗯差不多就是这样，如果感觉代码渣的话，那就对了还请包涵
好了就这样~
然后如果要想把获得到的数据呈现给用户或者使用什么的，调用方法，然后遍历那个返回的 valueList 就行了。我就直接把它输出出来了。最后分享我的心率♥
听说 Band 的心率传感器还挺准？不知道。
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原文地址：http://www.cnblogs.com/coding-kg/p/4889909.html
