private void WebView_Navigated(object sender, WebNavigatedEventArgs e)
{
try
{
//Action onFinish = new Action(() => { Navigation.PushAsync(new Page1()); Navigation.RemovePage(this); });
Action onFinish = new Action(() => { buttonContinue.IsVisible = true; });
var thread = new Thread(async() => {
await Task.Delay(30 * 1000); //wait 30 seconds before start measuring
TestMeViewModel b = new TestMeViewModel();
b.Progress = 0;
MeasurementHandler.GetStressResult(-1, b);
while (b.IsFinished == false)
{
if (b.StressResult.StartsWith("Error"))
{
//TODO: alert user and try again
return;
}
}
//int repetitionTime = MeasurementHandler.measureRepetitionTime;
//DependencyService.Get<ISchedule>().ScheduleMeasurement(repetitionTime); //Schedule measurement every 6 minutes
Xamarin.Forms.Device.BeginInvokeOnMainThread(onFinish);
});
thread.Start();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
public async Task <bool> readRRSensor(TestMeViewModel b, int sec)
{
Activity activity = Droid.MainActivity.instance;
_contactSensor.StartReadings();
while (_bandState == null)
{
} //get the band state
if (_bandState != BandContactState.Worn)
{
_bandState = null;
//TODO: notify the user by sending a notification
return(false);
}
_distancerSensor.StartReadings();
while (currentMotionTyp == null)
{
}
if (currentMotionTyp == MotionType.Walking || currentMotionTyp == MotionType.Jogging || currentMotionTyp == MotionType.Running)
{
b.StressResult = "Error: can't measure during sports activity";
Log.Error("motion", "user is " + currentMotionTyp.ToString());
return(false);
}
_rrIntervalsReadings.Clear();
//RequestConsent();
_rrSensor.StartReadings();
await Task.Delay(sec * 1000);
_rrSensor.StopReadings();
_contactSensor.StopReadings();
return(true);
}
public TestMe(bool isSignup)
{
InitializeComponent();
BindingContext = new TestMeViewModel();
this.isSignup = isSignup;
if (isSignup)
{
StartMeasure(-1); //auto start
}
}
public static async Task GetStressResult(int pseudo, TestMeViewModel b)
{
List <double> rrIntervals = null;
bool bluetoothWasOn = false;
if (pseudo < 0)
{
//turn on bluetooth if needed
bluetoothWasOn = DependencyService.Get <IBluetooth>().TurnOn();
if (!bluetoothWasOn)
{
await Task.Delay(3 * 1000);
}
bool isBandConnected = DependencyService.Get <IBand>().ConnectToBand(b).Result;
if (!isBandConnected)
{
b.StressResult = "Error: band isn't connected";
if (!bluetoothWasOn)
{
DependencyService.Get <IBluetooth>().TurnOff();
}
return; //can't connect to band
}
b.StressResult = "Reading...";
await DependencyService.Get <IBand>().RequestConsent();
await DependencyService.Get <IBand>().readRRSensor(b, testTimeInSec);
rrIntervals = DependencyService.Get <IBand>().RRIntervalReadings();
}
if (rrIntervals != null && rrIntervals.Count == 0)
{
b.StressResult = "Error: can't read heart rate. make sure your band is worn and connected.";
b.Progress = 1;
if (!bluetoothWasOn)
{
DependencyService.Get <IBluetooth>().TurnOff();
}
return;
}
Uri measurementUri = BuildMeasurementUri(rrIntervals, pseudo);
bool success = await AzureFunctionAddMeasurement(measurementUri, b);
if (!success)
{
StoreIntervalsToLocalMemory(measurementUri);
}
b.Progress = 1;
if (!bluetoothWasOn)
{
DependencyService.Get <IBluetooth>().TurnOff();
}
}
public async Task <bool> ConnectToBand(TestMeViewModel b)
{
try
{
if (_client == null)
{
//get all paired devices (we only care about the 1st)
IBandInfo[] devices = BandClientManager.Instance.GetPairedBands();
if (devices.Length == 0)
{
if (b != null)
{
b.IsConnected = false;
}
Activity activity = Droid.MainActivity.instance;
activity.RunOnUiThread(() =>
{
Toast.MakeText(Droid.MainActivity.context,
"make sure your band is paired with this device and try again",
ToastLength.Long).Show();
});
return(false);
}
_client = BandClientManager.Instance.Create(Droid.MainActivity.context, devices[0]);
}
else if (_client.ConnectionState == ConnectionState.Connected)
{
if (b != null)
{
b.IsConnected = true;
}
return(true);
}
//connecting to device
ConnectionState connectionState = await _client.ConnectTaskAsync();
if (b != null)
{
b.IsConnected = _client.IsConnected;
} //update TestMeViewModel
InitSensors(b); //register sensors listeners
return(_client.IsConnected);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return(false);
}
}
private void StartMeasure(int pseudo)
{
TestMeViewModel b = (TestMeViewModel)BindingContext;
b.PNN50 = 0;
//don't make the UI thread wait
var thread = new Thread(
() =>
{
MeasurementHandler.GetStressResult(pseudo, b);
});
b.Progress = 0;
thread.Start();
double msPass = 0;
int testTime = MeasurementHandler.testTimeInSec;
Device.StartTimer(TimeSpan.FromMilliseconds(50), () =>
{
if (b.Progress < 1)
{
msPass += 50;
b.Progress = msPass <= testTime * 1000 ? msPass / (testTime * 1000) : (msPass - 1) / msPass;
if (b.StressResult.StartsWith("Error"))
{
return(false);
}
return(true);
}
if (isSignup)
{
if (b.StressResult.StartsWith("you")) //succeeded
{
Device.BeginInvokeOnMainThread(async() =>
{
await Navigation.PushAsync(new Pages.SignupStressTest());
Navigation.RemovePage(this); //user can't go back});
});
return(false);
}
return(true);
}
else
{
return(false);
}
});
}
public async Task <int> getHR(TestMeViewModel b)
{
await ConnectToBand(b);
InitSensors(b);
Activity activity = Droid.MainActivity.instance;
_contactSensor.StartReadings();
while (_bandState == null)
{
}
if (_bandState != BandContactState.Worn)
{
_bandState = null;
return(-1);
}
_hrSensor.StartReadings();
return(0);
}
static async Task <bool> AzureFunctionAddMeasurement(Uri measurementUri, TestMeViewModel b)
{
var httpClient = new HttpClient();
try
{
b.StressResult = "Calculating...";
String result = await httpClient.GetStringAsync(measurementUri);
result = result.Substring(1, result.Length - 2); //remove the " at the beginning and end
b.StressResult = result;
return(true);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
b.StressResult = "Error: could not connect to Azure. Make sure your phone is connected to the Internet";
return(false);
}
}
public static async Task <bool> ResendIntervals()
{
//get the previous failed-to-send intervals uri
Queue <Uri> previousCalls;
if (Application.Current.Properties.ContainsKey("previousCalls"))
{
String serializedStack = Application.Current.Properties["previousCalls"].ToString();
previousCalls = JsonConvert.DeserializeObject <Queue <Uri> >(serializedStack);
}
else
{
previousCalls = new Queue <Uri>();
}
//resend intervals
Uri currentMeasurement;
TestMeViewModel b = new TestMeViewModel();
while (previousCalls.Count > 0)
{
currentMeasurement = previousCalls.First(); //get the first without Dequeue
bool success = await AzureFunctionAddMeasurement(currentMeasurement, b);
if (success)
{
previousCalls.Dequeue(); //remove first and continue
}
else
{
break; //failed to send intervals again
}
}
//store
Application.Current.Properties["previousCalls"] = JsonConvert.SerializeObject(previousCalls);
await Application.Current.SavePropertiesAsync();
return(previousCalls.Count == 0); //returns true if all previous intervals successfully sent
}
//assumes the band is connected
public async Task <int> getGSR(TestMeViewModel b, int sec)
{
Activity activity = Droid.MainActivity.instance;
_contactSensor.StartReadings();
while (_bandState == null)
{
}
if (_bandState != BandContactState.Worn)
{
_bandState = null;
return(-1);
}
_gsrDone = false;
_gsrReadings.Clear();
b.GsrList = "#";
_gsrSensor.StartReadings();
await Task.Delay(sec * 1000);
_gsrDone = true;
_contactSensor.StopReadings();
return(0);
}
public void InitSensors(TestMeViewModel b)
{
if (!_client.IsConnected)
{
return;
}
_hrSensor = _hrSensor ?? _client.SensorManager.CreateHeartRateSensor();
_gsrSensor = _gsrSensor ?? _client.SensorManager.CreateGsrSensor();
_rrSensor = _rrSensor ?? _client.SensorManager.CreateRRIntervalSensor();
_contactSensor = _contactSensor ?? _client.SensorManager.CreateContactSensor();
_distancerSensor = _distancerSensor ?? _client.SensorManager.CreateDistanceSensor();
if (_contactSensor == null || _hrSensor == null || _gsrSensor == null || _rrSensor == null || _distancerSensor == null)
{
return;
}
Activity activity = Droid.MainActivity.instance;
//register contact listener
_contactSensor.ReadingChanged += (sender, e) =>
{
var contactEvent = e.SensorReading;
_bandState = contactEvent.ContactState;
};
//register heart rate listener
_hrSensor.ReadingChanged += (sender, e) =>
{
activity.RunOnUiThread(() =>
{
var heartRateEvent = e.SensorReading;
//_hrReadings.Add(heartRateEvent.HeartRate);
if (heartRateEvent.Quality == HeartRateQuality.Locked)
{
_hrSensor.StopReadings();
_contactSensor.StopReadings();
// if (b != null) { b.HR = _hrReadings[_hrReadings.Count - 1]; } //update ViewModel
}
if (_bandState != BandContactState.Worn) //user took off the band while reading
{
_hrSensor.StopReadings();
_contactSensor.StopReadings();
_bandState = null;
return;
}
});
};
//register gsr listener
_gsrSensor.ReadingChanged += (sender, e) =>
{
activity.RunOnUiThread(() =>
{
var gsrEvent = e.SensorReading;
_gsrReadings.Add(gsrEvent.Resistance);
if (b != null)
{
b.GsrList = gsrEvent.Resistance.ToString();
}
if (_gsrDone)
{
_gsrSensor.StopReadings();
_contactSensor.StopReadings();
return;
}
});
};
//register RR Intervals listener
_rrSensor.ReadingChanged += (sender, e) =>
{
if (_bandState != BandContactState.Worn) //user took off the band while reading
{
_rrSensor.StopReadings();
_contactSensor.StopReadings();
_bandState = null;
b.StressResult = "Error: band is not worn.";
return;
}
var rrEvent = e.SensorReading;
_rrIntervalsReadings.Add(rrEvent.Interval);
};
_distancerSensor.ReadingChanged += (sender, e) =>
{
currentMotionTyp = e.SensorReading.MotionType;
_distancerSensor.StopReadings();
};
}
