How to access heart rate sensor in Android Wearable?

Question

I am having problems accessing heart rate sensor on Moto 360.

I tried following things :

Sensor mHeartRateSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_HEART_RATE);
mSensorManager.registerListener(this, mHeartRateSensor, SensorManager.SENSOR_DELAY_NORMAL);

and then implement SensorEventListener interface :

@Override
public void onSensorChanged(SensorEvent event) {

        String TAG = "tag";
        Log.i(TAG, "--------------------------");
        Log.i(TAG, msg);
        Log.i(TAG, ""+ event.sensor.getType());
        Log.i("live","--------------");

And what is strange to me I do not get any messages at all (not only heart rate).

Also I tried listing all sensors and it does not show Heart rate sensor on the list.

Of course I've added persmissions

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.watchtest" >

<uses-feature android:name="android.hardware.type.watch" />
<uses-permission android:name="android.permission.BODY_SENSORS" />

Any ideas ?

thanks.

w.

Findley

Have you tried updating the SDK? link – Neurocoele

I agree with Kent, make sure your SDK is up to date, someone had a similar issue fixed: #25821271 – Bullins

@Neurocoele Is project somehow tied to the SDK? As I had latest SDK and it did not work. But when I created new project it start working. – Findley

I had same problem. I got som values for a short periode of time, then it returned the same values for a minute or so, then giving me a few different values, before it again stopped. seams like it´s a general problem for Moto 360. – Giuseppinagiustina

Answer 1

As @Kent and @Murphy suggested, updated SDK was the solution. In my case I needed to drop the project and create new from scratch as even with updated SDK old one did not work.

Findley

Can you accept this answer? This way everyone knows it's been resolved. – Bullins

I believe the trick is to uninstall the app from the watch. Here is a sample command: adb -s localhost:4444 uninstall com.example.android.wearable.jumpingjack – Diatonic

I also have: android:minSdkVersion="20" android:targetSdkVersion="20" And SDK version of watch is 4.4W.2, and in my SDK Manager it is rev.2 for SDK Platform, rev. 3 for sample, rev. 4 for Wear images and rev. 1 for sources. – Diatonic

With these changes, I now have Heart Rate Sensor and am able to get reading from it. – Diatonic

Answer 2

Started to work for me after I did the following:

1. Uninstalled my app from the watch with

   adb -s localhost:4444 uninstall com.example.android.wearable.jumpingjack
   

2. Added permissions to get the heart rate sensor

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

3. Set the min and target SDK version to match the watch

   android:minSdkVersion="20" android:targetSdkVersion="20"
   

Started the app again. I received the heart rate sensor with Sensor.TYPE_HEART_RATE and I started to receive its readings. Although they were far from good. There were a lot of readings, but they were just the same, limited to these 5 values:

heartRate onSensorChanged values = [0.0], accuracy = 0, sensor = {Sensor name="Heart Rate Sensor", vendor="Motorola", version=1, type=21, maxRange=65535.0, resolution=1.0, power=0.45, minDelay=0}
heartRate onSensorChanged values = [53.0], accuracy = 2, sensor = {Sensor name="Heart Rate Sensor", vendor="Motorola", version=1, type=21, maxRange=65535.0, resolution=1.0, power=0.45, minDelay=0}
heartRate onSensorChanged values = [54.0], accuracy = 2, sensor = {Sensor name="Heart Rate Sensor", vendor="Motorola", version=1, type=21, maxRange=65535.0, resolution=1.0, power=0.45, minDelay=0}
heartRate onSensorChanged values = [55.0], accuracy = 2, sensor = {Sensor name="Heart Rate Sensor", vendor="Motorola", version=1, type=21, maxRange=65535.0, resolution=1.0, power=0.45, minDelay=0}
heartRate onSensorChanged values = [77.0], accuracy = 1, sensor = {Sensor name="Heart Rate Sensor", vendor="Motorola", version=1, type=21, maxRange=65535.0, resolution=1.0, power=0.45, minDelay=0}

Most of the time I was getting the same 53.0 value which doesn't seem to be my real heart rate. 77 could have been the one.

Diatonic

Answer 3

I had quite a similar problem on the Moto 360. The sensor always returned 0.0f as a value.

Then I waited for two minutes, and suddenly values!=0 came in. It seems that this sensor needs a "warmup" before showing anything. Not really astonishing if you take into account that it measures something happening roughly once a second with the unit "beats per minute". It cannot be reliable before one or two minutes have passed. And each app has its own measurement: It doesn't matter if another heartbeat app is also running (like the Moto Body thing).

This also means that you must create a service to listen to the sensor (and a binder to pass the sensor's value to your activity or your phone).

Have a look at the demo project I shared on github: https://github.com/upost/MyHeartbeat

Anjelicaanjou

Answer 4

So, I came here, with the same problem and the simple solution is to remove the application from the watch using the adb:

adb -s localhost:4444 uninstall com.*packagename*

Then simply reinstall it using android studio, eclipse or whatever you used originally.

Thanks to Alexander K for this solution

Parvis