Get Heart Rate from "Sensor" Samsung Gear Live

Question

How do I get the heartrate from the attached sensor on the Samsung Gear Live

I just tried to list all Sensors by

SensorManager  mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
List<Sensor> deviceSensors = mSensorManager.getSensorList(Sensor.TYPE_ALL);
for(Sensor s : deviceSensors){
    Log.i(TAG, "" + s.getName());
}

But I only get theses Sensors:

07-09 23:18:05.047    3269-3269/com.sample.soma.wapp I/MyActivity﹕ MPU6515 Acceleration Sensor
07-09 23:18:05.047    3269-3269/com.sample.soma.wapp I/MyActivity﹕ MPU6515 Gyroscope Sensor
07-09 23:18:05.057    3269-3269/com.sample.soma.wapp I/MyActivity﹕ AK8963C Magnetic field Sensor
07-09 23:18:05.057    3269-3269/com.sample.soma.wapp I/MyActivity﹕ AK8963C Magnetic Sensor UnCalibrated
07-09 23:18:05.057    3269-3269/com.sample.soma.wapp I/MyActivity﹕ SAMSUNG Step Detector Sensor
07-09 23:18:05.057    3269-3269/com.sample.soma.wapp I/MyActivity﹕ SAMSUNG Step Counter Sensor
07-09 23:18:05.057    3269-3269/com.sample.soma.wapp I/MyActivity﹕ SAMSUNG Significant Motion Sensor
07-09 23:18:05.057    3269-3269/com.sample.soma.wapp I/MyActivity﹕ SAMSUNG Game Rotation Vector
07-09 23:18:05.057    3269-3269/com.sample.soma.wapp I/MyActivity﹕ SAMSUNG Tilt Wake Sensor
07-09 23:18:05.057    3269-3269/com.sample.soma.wapp I/MyActivity﹕ MPL Rotation Vector
07-09 23:18:05.057    3269-3269/com.sample.soma.wapp I/MyActivity﹕ MPL Orientation
07-09 23:18:05.067    3269-3269/com.sample.soma.wapp I/MyActivity﹕ MPL Gravity
07-09 23:18:05.067    3269-3269/com.sample.soma.wapp I/MyActivity﹕ MPL Linear Accelration

How do they measure the heart rate? Are some parts of the Android W Apps open sourced so I can have a look at them?

Thanks and Greets.

Answer 1

Here is a gist that shows how to read the heart rate sensor.

The meat of it is:

SensorManager mSensorManager = ((SensorManager)getSystemService(SENSOR_SERVICE));
Sensor mHeartRateSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_HEART_RATE);
Sensor mStepCountSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
Sensor mStepDetectSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR);

mSensorManager.registerListener(this, mHeartRateSensor, SensorManager.SENSOR_DELAY_NORMAL);
mSensorManager.registerListener(this, mStepCountSensor, SensorManager.SENSOR_DELAY_NORMAL);
mSensorManager.registerListener(this, mStepDetectSensor, SensorManager.SENSOR_DELAY_NORMAL);

You will also need the following entry in the AndroidManifest.xml

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

Answer 2

A little example: (full gist here:https://gist.github.com/gabrielemariotti/d23bfe583e900a4f9276)

public class MyActivity extends Activity implements SensorEventListener {

        //Sensor and SensorManager
        Sensor mHeartRateSensor;
        SensorManager mSensorManager;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.heart_layout);

            //Sensor and sensor manager
            mSensorManager = ((SensorManager)getSystemService(SENSOR_SERVICE));
            mHeartRateSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_HEART_RATE);

            //.... 
        }

        @Override
        protected void onResume() {
            super.onResume();
            //Register the listener
            if (mSensorManager != null){
                mSensorManager.registerListener(this, mHeartRateSensor, SensorManager.SENSOR_DELAY_NORMAL);
            }
        }

        @Override
        protected void onPause() {
            super.onPause();
            //Unregister the listener
            if (mSensorManager!=null)
                mSensorManager.unregisterListener(this);
        }

        @Override
        public void onSensorChanged(SensorEvent event) {
            //Update your data. 
            if (event.sensor.getType() == Sensor.TYPE_HEART_RATE) {            
                 //heart rate = (int) event.values[0];
                }
            }
        }

        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {

        }
    }

Add in your Manifest

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